renewable energy topics research paper

Towards Sustainable Energy: A Systematic Review of Renewable Energy Sources, Technologies, and Public Opinions

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Research Article

A systematic bibliometric review of clean energy transition: Implications for low-carbon development

Roles Writing – original draft, Writing – review & editing

Affiliation School of Statistics, Shandong University of Finance and Economics, Jinan, China

Roles Data curation, Software

Roles Conceptualization, Writing – review & editing

* E-mail: [email protected]

Affiliation Centre for Corporate Sustainability and Environmental Finance, Department of Applied Finance, Macquarie Business School, Macquarie University, Sydney, Australia

Roles Methodology, Validation

Affiliation School of Humanities and Foreign Languages, Qingdao University of Technology, Qingdao, China

Roles Software, Visualization

• Wei Zhang, 
• Binshuai Li, 
• Rui Xue, 
• Chengcheng Wang, 

• Published: December 3, 2021
• https://doi.org/10.1371/journal.pone.0261091
• Reader Comments

More voices are calling for a quicker transition towards clean energy. The exploration and exploitation of clean energy such as wind energy and solar energy are effective means to optimise energy structure and improve energy efficiency. To provide in-depth understanding of clean energy transition, this paper utilises a combination of multiple bibliometric mapping techniques, including HistCite, CiteSpace and R Bibliometrix, to conduct a systematic review on 2,191 clean energy related articles obtained from Web of Science (WoS). We identify five current main research streams in the clean energy field, including Energy Transition, Clean Energy and Carbon Emission Policy, Impact of Oil Price on Alternative Energy Stocks, Clean Energy and Economics, and Venture Capital Investments in Clean Energy. Clearly, the effectiveness of policy-driven and market-driven energy transition is an important ongoing debate. Emerging research topics are also discussed and classified into six areas: Clean Energy Conversion Technology and Biomass Energy Utilisation, Optimisation of Energy Generation Technology, Policy-Making in Clean Energy Transition, Impact of Clean Energy Use and Economic Development on Carbon Emissions, Household Use of Clean Energy, and Clean Energy Stock Markets. Accordingly, more and more research attention has been paid to how to improve energy efficiency through advanced clean energy technology, and how to make targeted policies for clean energy transition and energy market development. This article moves beyond the traditional literature review methods and delineates a systematic research agenda for clean energy research, providing research directions for achieving low-carbon development through the clean energy transition.

Citation: Zhang W, Li B, Xue R, Wang C, Cao W (2021) A systematic bibliometric review of clean energy transition: Implications for low-carbon development. PLoS ONE 16(12): e0261091. https://doi.org/10.1371/journal.pone.0261091

Editor: Ghaffar Ali, Shenzhen University, CHINA

Received: July 29, 2021; Accepted: November 23, 2021; Published: December 3, 2021

Copyright: © 2021 Zhang et al. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Data Availability: The data underlying the results presented in the study are available from: Zhang, Wei; Li, Binshuai; Xue, Rui; Wang, Chengcheng; Cao, Wei (2021), “Clean Energy Related Literature Data”, Mendeley Data, V1, doi: 10.17632/h9n69648d9.1 .

Funding: This research was supported by the National Social Science Foundation of China (Grant Number: 20BTJ030), the Social Science Planning Foundation of Shandong Province (16CTJJ01) and Youth Innovation Program of Shandong Province (2019REW021). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

Competing interests: The authors have declared that no competing interests exist.

1 Introduction

Currently, many countries worldwide have proposed and implemented their green recovery plans [ 1 – 3 ]. Public voices for transitioning to clean energy are increasingly high, shifting investors’ attention from traditional energy markets to clean energy markets. Therefore, it is important and urgent to systematically understand how to transition to a “clean” world.

Considering this context, the key research question of this study is to provide a comprehensive understanding of the current progress of the clean energy transition and illustrate a research agenda for emerging areas that await more academic and practical attention. To address the research question, this study provides a systematic literature review of 2,191 articles on clean energy related areas obtained from the Web of Science (WoS) Core Collection database over the period from 1950 to 2020. Using a combination of multiple bibliometric mapping techniques, we identify the main streams of current research and propose important topics for future research, providing comprehensive insights for the developments in clean energy transitions and a theoretical basis for more effective ways to achieve carbon neutrality.

Current main streams of clean energy research identified by bibliometric analysis include Energy Transition, Clean Energy and Carbon Emission Policy, Impact of Oil Price on Alternative Energy Stocks, Clean Energy and Economics, and Venture Capital Investments in Clean Energy.

Specifically, the Energy Transition research stream focuses on the barriers to energy transition at the national and household level [ 4 ]. Given the governments’ dominant role in promoting the clean energy transition [ 5 ], the Clean Energy and Carbon Emission Policy stream concentrates on assessing governments’ related policies and their impacts on carbon emissions. The Impact of Oil Price on Alternative Energy Stocks stream centres around the influencing factors on clean energy stock prices; existing studies show that oil prices, technology stock prices, and interest rates are prominent factors affecting clean energy stock prices [ 6 ]. The Clean Energy and Economics stream tends to apply econometric models to test the causal relationship between clean energy consumption and socio-economic variables such as economic growth [ 7 ] and foreign direct investment (FDI) [ 8 ]. As the soaring demand for clean energy attracts a significant amount of venture capital inflows, especially the private ones [ 9 ], the identification and minimisation of investment risk for investors remains the major topic for current research in Venture Capital Investments in Clean Energy.

We further employ the cluster analysis of articles published in recent five years (2015–2020) to propose the emerging trends and future directions in clean energy research. Clean Energy Conversion Technology and Biomass Energy Utilisation, Optimisation of Energy Generation Technology, Policy-Making in Clean Energy Transition, Impact of Clean Energy Use and Economic Development on Carbon Emissions, Household Use of Clean Energy, and Clean Energy Stock Markets are trending topics in the clean energy transition.

Specifically, a growing trend in Clean Energy Conversion Technology and Biomass Energy Utilisation aims to enhance the efficiency and reliability of the biomass gasification system [ 10 , 11 ]. Research in Optimisation of Energy Generation Technology has been paying more attention to explore ways to effectively integrate new energy resources with traditional ones, construct an efficient hybrid energy system, and resolve the environmental problems incurred from the use of clean energy [ 12 , 13 ]. Because of the significant discrepancies in the influences of local governments’ clean energy policies [ 14 , 15 ], the Policy-Making in Clean Energy Transition research continues to explore how local governments should formulate policies conducive to the development of clean energy. The Impact of Clean Energy Use and Economic Development on Carbon Emissions stream provides policymakers with emission reduction recommendations. It starts to investigate the implications of clean energy use and various economic factors, particularly on carbon productivity and carbon transfer [ 16 ]. The vital issue of Household Use of Clean Energy research is to increase the the heating system’s energy efficiency and to accelerate the energy transfer of clean cooking [ 17 ]. Finally, studies on Clean Energy Stock Markets examine the correlation between clean energy stock prices and the overall stock market, green bond market, electricity market, and coal market [ 18 , 19 ].

Through systematic reviews of current and trending topics in clean energy research, we aim to delineate a critical research agenda for clean energy transition as an effective way to achieve a low-carbon development and carbon neutrality. The article proceeds as follows. Section 2 introduces the literature retrieval process, the bibliometric techniques used and the descriptive information of existing literature on clean energy. Section 3 illustrates the citation map to identify current main streams in clean energy research and provides a critical review of every stream. Section 4 proposes emerging areas and trending topics. Section 5 concludes the article and provides an agenda for future research in the clean energy transition.

2 Research methods

2.1 literature retrieval process.

The method of literature retrieval and bibliometric analysis used in this study is illustrated in Fig 1 . Specifically, we collect basic information and cited references of clean energy articles from Web of Science (WoS) over the period of 1950 to June 2020, with themes limited to “clean energy” and journal sources limited to “SSCI, SCIE, A&HCI.” A total of 2,652 initial articles is retrieved. For validation purposes, we have implemented manual checks to select relevant articles, resulting in 471 irrelevant articles removed. Following Linnenluecke et al. (2017) [ 20 ], we then add another ten most cited clean energy articles into our database. Therefore, we obtain 2,191 articles in our final dataset.

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https://doi.org/10.1371/journal.pone.0261091.g001

Table 1 shows the basic information of sample articles. The next section will introduce the bibliometric techniques used, i.e., R Bibliometrix, HistCite and CiteSpace, to analyse these clean energy articles.

https://doi.org/10.1371/journal.pone.0261091.t001

2.2 Bibliometric techniques

2.2.1 r bibliometrix..

Bibliometrix is a widely-used R-package developed by Massimo and Corrado (2017) [ 21 ]. It provides access to a wide range of bibliometric functions and excellent visualisation tools. This article uses Bibliometrix to carry out descriptive statistical analysis to illustrate the diagrams for the number of publications over time and the author-keyword-journal connections (Sankey diagram).

2.2.2 HistCite.

HistCite is a citation software developed by Eugene (2004) [ 22 ]. The citation map generated by HistCite is highly useful for mapping out the relationships among highly cited publications [ 23 ]. It is a popular tool for researchers to explore research hotspots and how research themes develop over time. It is an essential tool for bibliometric analysis. This paper utilises HistCite to generate the citation map of 50 highly cited articles as guidance to identify key streams of clean energy research.

2.2.3 CiteSpace.

CiteSpace is a Java visualization application developed by Chen (2017) [ 24 ]. It has powerful bibliometric and visualization functions and is extremely popular in research. It generates a spectrum of colors to depict the literature network’s temporal orders and uses algorithms such as LLR for cluster labeling extraction. This article uses this application to cluster keywords of relevant literature from 2015 to 2020 to identify future research hotspots.

2.3 Descriptive information

2.3.1 publications over time..

Fig 2 illustrates the number of publications from 2000 to 2019. The sample ends at June 2020 and the total number of publications from January 2020 to June 2020 is 274; so to make the diagram more illustrative, we do not include the publication number of 2020. Fig 2 indicates a three-stage development of clean energy research. The first stage (from 2000 to 2010) is the initial stage, with an average of 17.5 articles published per year. The period of 2011–2015 is the developing stage, with an average of 97.4 articles published per year. The publications in the clean energy areas experience a significant increase from 2016, with an average number of 291.5 publications per year (2016–2019). It signals a robust momentum in clean energy research. The clean energy transition is crucially important to mitigate climate change issues and achieve carbon neutrality. Therefore, it is expected to continue to (exponentially) grow in the next few decades.

https://doi.org/10.1371/journal.pone.0261091.g002

2.3.2 Author-Keyword-Journal (AKJ) analysis.

Fig 3 displays the Sankey diagram, i.e., the author-keyword-journal diagram. The three columns in Fig 3 are the top 20 authors, keywords, and source journals in clean energy research, respectively. The Sankey diagram gives a graphical overview of influential clean energy research. The keywords broadly fall into the following categories: Clean Energy Stock Performance, Clean Energy and Economy Growth, Energy Consumption and Carbon Emissions, Clean Energy Power Generation, and Clean Energy Policy. The major publishing journals in the clean energy area include Renewable Energy , Journal of Cleaner Production , Energy Policy , Energy Economics , Applied Energy , etc.

https://doi.org/10.1371/journal.pone.0261091.g003

3 Developments in clean energy transition research

3.1 identification of current research streams.

In this section, we utilise HistCite to generate a citation network map for the top 50 cited articles in clean energy transition research. We then apply the triangulation process [ 23 ] to assign titles for each research stream, laying the foundation for the systematic review of these research themes. Table 2 summarises the citation information of top-cited literature, and Fig 4 illustrates the corresponding citation network map.

https://doi.org/10.1371/journal.pone.0261091.g004

https://doi.org/10.1371/journal.pone.0261091.t002

In Fig 4 , each article is displayed as a node, with a larger-sized node denoting a higher number of citations. The arrows illustrate the citation connections among articles, with arrowheads pointed to the cited ones. Through the triangulation process, we categorise the current clean energy research into the following streams: Energy Transition, Clean Energy and Carbon Emission Policy, Impact of Oil Price on Alternative Energy Stocks, Clean Energy and Economics, and Venture Capital Investments in Clean Energy. In the next section, we provide a comprehensive review of each of these five research streams.

3.2 Review of main research streams

3.2.1 energy transition..

The transition from traditional energy towards clean energy remains the major challenge for the first half of the 21st century [ 4 ]. We discuss the Energy Transition stream from two perspectives: obstacles in clean energy transition and influencing factors on household energy transition.

3 . 2 . 1 . 1 Obstacles in the clean energy transition . Current major challenges to clean energy transition include subsidies to traditional energy, high initial capital cost, high transaction cost, high financing risk, lack of price risk assessment, lack of clean technology, low market acceptance rate, and immature regulatory systems [ 25 – 28 ]. Luthra et al. (2015) [ 29 ] categorised 28 obstacles to the clean energy transition into seven dimensions: economy and finance, market, awareness and information, technology, ecology and geography, culture and behavior, political and government issues. For an in-depth look, the more challenging obstacles are ecological problems, consumers’ lack of awareness of clean technology, inability to obtain solar radiation data, technical complexity, rehabilitation disputes and lack of political commitment.

3 . 2 . 1 . 2 Influencing factors on household energy transition . Household energy use is a substantial part of energy consumption. Investigating the driving factors affecting household energy transition is an effective way to promote clean energy transition. Researchers conduct surveys on households in urban and rural areas in China, India, Brazil, Ethiopia, Guatemala, and other countries. Their results show that 1) household income and fuel prices are the dominant factors affecting household energy transition, 2) household size, household members’ occupations, and education levels are also important factors, and 3) the availability and cost of clean energy alternatives have a significant impact on rural household energy transition [ 30 – 42 ].

3.2.2 Clean energy and carbon emission policy.

The high carbon energy represented by raw coal was still the main factor in promoting the growth of energy-related CO2 emissions [ 43 ]. Appropriate and effective policies are needed to accelerate the clean energy transition. The majority of countries worldwide have set goals to increase the share of clean energy consumption and reduce greenhouse gas (GHG) emissions, resulting in various supportive policies [ 44 ]. Existing policies concentrate around quantity-driven policies. For instance, levying a carbon tax is a typical quantity-driven policy. Guo et al. (2014) [ 5 ] argues that a moderate carbon tax significantly reduces carbon emissions and fossil fuel consumption, with a minimal impact on economic growth. But a more recent study claims that carbon taxes are not always good for the environment [ 45 ]. Another example is feed-in tariffs (FIT), a quantity-driven policy targeted at specific technology [ 46 ]. It is generally regarded as an effective policy for clean energy transition due to its advantages of low costs, low risks, and high innovation incentives [ 47 – 51 ].

3.2.3 Impact of oil price on alternative energy stocks.

The way how oil prices affect stock prices works as follows. On the one hand, rising oil prices increase production and service costs and decrease cash flow turnover, leading to a stock price drop. On the other hand, rising oil prices also indicate the mounting inflation pressure and discount rate, resulting in stock price drop [ 52 ]. As a critical component of the stock market, energy stocks are also highly correlated with oil prices [ 52 – 55 ]. Nevertheless, the negative impact of oil prices may only be a short-term effect for clean energy stocks [ 6 ].

3.2.4 Clean energy and economics.

The clean energy transition is closely related to economic development [ 7 ]. In Fig 4 , the theme of Clean Energy and Economy contains comparatively more nodes (articles), the majority of which use different econometric models to examine the relationship between clean energy consumption and socio-economic variables such as economic growth and FDI. In the short term, there exists a positive correlation and bidirectional causal relationship between clean energy consumption and economic development. In the long run, clean energy consumption will positively affect on economic growth [ 8 , 56 – 60 ]. The empirical results of Paramati et al.(2016) [ 8 ] indicate that there is a unidirectional causality running from FDI to clean energy consumption, with inflows of FDI having a positive impact on the latter. Moreover, the results of Paramati et al.(2016) [ 8 ] also show that the development of the stock market has brought more investment in the clean energy industry and plays a significant role in promoting clean energy transition.

3.2.5 Venture capital investments in clean energy.

Venture capital (VC) is one of the main drivers of technology advancement, especially in new and innovative fields such as clean energy. As the demand for clean energy increases, there has been a surge of venture capital inflows, especially private VCs, into clean energy companies [ 9 , 61 , 62 ]. Currently, clean energy has become the third-largest venture investment field [ 63 ]. In addition, there are also risks embedded in clean energy investments, including market risks, technology risks, human resource risks, and more importantly, regulatory risks [ 64 ]. However, it is feasible to reduce market risks through appropriate business models, reduce technology risks through publicly funded R&D projects, reduce human resource risks through market liberalisation, and reduce regulatory risks through effective government policies [ 64 , 65 ].

4 Emerging research areas

To illustrate the emerging topics in clean energy transition research, we utilise CiteSpace to conduct cluster analysis on sample articles published in recent five years, from 2015 to 2020. The following two sections provide basic information on identified emerging topics and provide a detailed analysis of the relevant literature.

4.1 Identifications of emerging research areas

Fig 5 demonstrates the keyword co-occurrence network map of recent five years’ publications in clean energy transition areas, with a larger circle (keyword) representing more frequent occurrence, and darker colour representing earlier occurrence (publication time). The lines connecting circles (keywords) refer to co-occurrence.

https://doi.org/10.1371/journal.pone.0261091.g005

Using cluster analysis, CiteSpace classifies recent five years’ publications into seven clusters, reflecting seven emerging research topics in clean energy research. The clustered emerging topics include Surface Properties, Fuel Cell, Energy Transition, CO 2 Emission, Household Fuel Use, Oil Price, and Wind Farm. Once again, we apply the triangulation process to define the title of each cluster (area) and provide more details in Table 3 .

https://doi.org/10.1371/journal.pone.0261091.t003

4.2 Analyses of emerging research areas

4.2.1 clean energy conversion technology and biomass energy utilization..

Converting industrial waste and household garbage into clean energy can help deal with the current shortage of clean energy and protect the environment through the recycling process. Studies show that kitchen waste, animal waste, agricultural waste, forestry waste, waste plastics and waste tyres can be converted into clean energy through advanced technologies such as thermochemical conversion or hydrothermal carbonisation [ 10 , 66 – 70 ]. Research on improving these conversion technologies is a trending research hotspot. For example, biomass gasification is a feasible and practical clean energy conversion technology, but it faces crucial challenges to effectively eliminate the tar generated during the gasification process [ 11 , 71 , 72 ]. Another trending research topic in this area is to enhance the efficiency and reliability of biomass gasification. In addition, with the continuous advancement of clean energy conversion technology, how to formulate policies to implement more effective classifications of waste and refuse continues to be an urgent issue to be further explored.

4.2.2 Optimisation of Energy Generation Technology.

Comprehensive utilisation of various energy resources is an ideal approach to alleviate the energy crisis [ 73 ]. Many scholars have investigated how to integrate various new and traditional energy resources, including photovoltaics, batteries, diesel, wind energy, and solar energy, to build a highly effective hybrid energy system [ 12 , 13 , 74 ]. Research on the development of clean energy battery systems, the optimisation of power station scale, and generator systems also receives extensive academic attention [ 75 , 76 ].

Electricity generation from clean energy, such as wind and solar, plays a key role in the clean technology optimisation research [ 77 , 78 ]; however, a series of problems are setting obstacles for it. For instance, wind power generation has a high level of uncertainty, and there are potential exposure risks to the operation of a power grid [ 79 , 80 ]. Therefore, research on wind power generation in recent years tends to focus on wind flow models with the expectation to achieve a more accurate prediction of wind power generation [ 79 , 81 ]. Besides, considering the negative impact of the wind power plant on the environment, researchers have made significant explorations on the environmental effects of wind farms and on the selection of wind farm locations for harnessing wind energy [ 82 – 87 ]. Resolving the problems arising from the use of clean energy is an important topic to be further examined.

4.2.3 Policy-making in clean energy transition.

Regulations and legislations guarantee the secure transition towards clean energy. The government thus plays an essential role in addressing the potential risks incurred by the clean energy transition process. Relevant policies involve electricity price standards, emission trading system, clean energy investment policies, and the use of innovative finance tools in clean energy support [ 14 , 15 , 88 , 89 ]. Tingey and Webb (2020) [ 90 ], Bayulgen (2020) [ 91 ] and Proedrou (2019) [ 92 ] evaluate the practices of local government in the UK, US, and EU in terms of the clean energy transition. Their results indicate that although most local governments have adopted clean energy policies, the effectiveness of these policies varies substantially. To improve the effectiveness of energy policies, the views of different local energy users should be taken into account [ 93 ]. Therefore, what policies local governments should formulate to accelerate clean energy development will continue to be one of the research hotspots in clean energy transition research.

4.2.4 Impact of clean energy use and economic development on carbon emissions.

A large body of literature concentrates on how clean energy, economic growth, land resource use, industrial restructuring, financial market development, the application of new technology and R&D activities affect carbon emissions in recent clean energy areas [ 16 , 94 – 100 ]. And it is likely to be a hot issue worth studying in the future. With the improvement of carbon emission measurement methods, research on the impact of the aforementioned factors on carbon productivity and carbon transfer is attracting increasing scholarly attention [ 101 – 103 ]. Moreover, from a micro point of view, the role of enterprises, as an essential component of the national economy, in environmental governance will become another trending research direction [ 104 ].

4.2.5 Household use of clean energy.

Given that household energy use for heating and cooking is an essential part of energy use, recent studies have made substantial progress on enhancing the heating system’s energy efficiency and advancing the clean energy transition for cooking [ 17 , 105 – 108 ]. Moreover, in terms of the driving factors on the household clean energy transition, more recent literature indicates that household income and energy prices are found to have significant effects on household energy use decisions. Therefore, energy poverty is also an issue worth future research attention [ 109 – 111 ].

4.2.6 Clean energy stock markets.

Without support from the financial markets, the clean energy industry alone cannot secure the desired level of clean energy development. In effect, clean energy stocks have recently become a popular investment asset for investors, especially for those with strong considerations for environmental protection [ 18 , 112 ]. In addition to the follow-up research on the impact of oil price on clean energy stock prices [ 19 , 113 , 114 ], increasingly great attention has been focused on the relationship between clean energy stock investment and its driving factors, including the overall stock market, bond market, electricity market, coal market, gold market, silver market and many more [ 18 , 112 , 115 – 118 ]. Therefore, we reckon that the relationship between clean energy stocks and the financial markets, especially the green bond market [ 119 ] and the carbon market [ 53 ], has great potential to be explored in future clean energy research.

5 Conclusions

Clean energy transition plays a crucial role in post-pandemic green recoveries and carbon neutrality. To advance understanding of clean energy transition, this paper provides a systematic review of existing clean energy literature through a combination of bibliometric analysis techniques. Overall, there has been a surging trend of clean energy research since 2000, especially after 2016, clean energy research has experienced exponential growth.

We collect clean energy literature from the Web of Science (WoS) Core Collection database over the period from 1950 to 2020. Using bibliometric analysis, we identify and provide a comprehensive review of five current main research streams in the clean energy area, including Energy Transition, Clean Energy and Carbon Emission Policy, Impact of Oil Price on Alternative Energy Stocks, Clean Energy and Economics, and Venture Capital Investments in Clean Energy. Main challenges and opportunities facing the current clean energy transition with respect to each research stream are investigated.

To illustrate emerging research topics that attract more recent academic attention, we apply bibliometric cluster analysis to clean energy literature published in recent five years (from 2015 to 2020). Six trending research areas in the clean energy field are proposed and analysed, including Clean Energy Conversion Technology and Biomass Energy Utilisation, Optimisation of Energy Generation Technology, Policy-Making in Clean Energy Transition, Impact of Clean Energy Use and Economic Development on Carbon Emissions, Household Use of Clean Energy, and Clean Energy Stock Markets.

Future research agenda of clean energy awaits theoretical and practical exploration. We propose that the advancement of clean technology is at the heart of clean energy transition and post-pandemic green recovery. Funding for clean energy transition is a critical challenge that needs innovative financial instruments and policy support. Thus green bond markets, carbon taxes and emission trading system (ETS) need in-depth investigation. With more disruptive financing tools available such as crowdfunding, efforts from enterprises and individuals also deserve more attention. In addition, international collaborations on clean energy transition projects are highly recommended. Intensive international collaborations and cooperations are of high importance to achieve the low-carbon development. The completion of the global warming goal needs collective contributions from all countries over the world. A community of common destiny for all of humankind cannot be successfully built with efforts from only a small number of highly engaged countries. The current collaboration in clean energy research lacks worldwide collaborations in climate change actions. Therefore, it is highly recommended that all countries shall shoulder their responsibilities in climate change mitigation and adaptation, with steady growth of environmental investments and frequent collaborations with leading countries in climate change actions.

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Renewable energy for sustainable development in India: current status, future prospects, challenges, employment, and investment opportunities

• Charles Rajesh Kumar. J   ORCID: orcid.org/0000-0003-2354-6463 1 &
• M. A. Majid 1  

Energy, Sustainability and Society volume  10 , Article number:  2 ( 2020 ) Cite this article

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The primary objective for deploying renewable energy in India is to advance economic development, improve energy security, improve access to energy, and mitigate climate change. Sustainable development is possible by use of sustainable energy and by ensuring access to affordable, reliable, sustainable, and modern energy for citizens. Strong government support and the increasingly opportune economic situation have pushed India to be one of the top leaders in the world’s most attractive renewable energy markets. The government has designed policies, programs, and a liberal environment to attract foreign investments to ramp up the country in the renewable energy market at a rapid rate. It is anticipated that the renewable energy sector can create a large number of domestic jobs over the following years. This paper aims to present significant achievements, prospects, projections, generation of electricity, as well as challenges and investment and employment opportunities due to the development of renewable energy in India. In this review, we have identified the various obstacles faced by the renewable sector. The recommendations based on the review outcomes will provide useful information for policymakers, innovators, project developers, investors, industries, associated stakeholders and departments, researchers, and scientists.

Introduction

The sources of electricity production such as coal, oil, and natural gas have contributed to one-third of global greenhouse gas emissions. It is essential to raise the standard of living by providing cleaner and more reliable electricity [ 1 ]. India has an increasing energy demand to fulfill the economic development plans that are being implemented. The provision of increasing quanta of energy is a vital pre-requisite for the economic growth of a country [ 2 ]. The National Electricity Plan [NEP] [ 3 ] framed by the Ministry of Power (MoP) has developed a 10-year detailed action plan with the objective to provide electricity across the country, and has prepared a further plan to ensure that power is supplied to the citizens efficiently and at a reasonable cost. According to the World Resource Institute Report 2017 [ 4 , 5 ], India is responsible for nearly 6.65% of total global carbon emissions, ranked fourth next to China (26.83%), the USA (14.36%), and the EU (9.66%). Climate change might also change the ecological balance in the world. Intended Nationally Determined Contributions (INDCs) have been submitted to the United Nations Framework Convention on Climate Change (UNFCCC) and the Paris Agreement. The latter has hoped to achieve the goal of limiting the rise in global temperature to well below 2 °C [ 6 , 7 ]. According to a World Energy Council [ 8 ] prediction, global electricity demand will peak in 2030. India is one of the largest coal consumers in the world and imports costly fossil fuel [ 8 ]. Close to 74% of the energy demand is supplied by coal and oil. According to a report from the Center for monitoring Indian economy, the country imported 171 million tons of coal in 2013–2014, 215 million tons in 2014–2015, 207 million tons in 2015–2016, 195 million tons in 2016–2017, and 213 million tons in 2017–2018 [ 9 ]. Therefore, there is an urgent need to find alternate sources for generating electricity.

In this way, the country will have a rapid and global transition to renewable energy technologies to achieve sustainable growth and avoid catastrophic climate change. Renewable energy sources play a vital role in securing sustainable energy with lower emissions [ 10 ]. It is already accepted that renewable energy technologies might significantly cover the electricity demand and reduce emissions. In recent years, the country has developed a sustainable path for its energy supply. Awareness of saving energy has been promoted among citizens to increase the use of solar, wind, biomass, waste, and hydropower energies. It is evident that clean energy is less harmful and often cheaper. India is aiming to attain 175 GW of renewable energy which would consist of 100 GW from solar energy, 10 GW from bio-power, 60 GW from wind power, and 5 GW from small hydropower plants by the year 2022 [ 11 ]. Investors have promised to achieve more than 270 GW, which is significantly above the ambitious targets. The promises are as follows: 58 GW by foreign companies, 191 GW by private companies, 18 GW by private sectors, and 5 GW by the Indian Railways [ 12 ]. Recent estimates show that in 2047, solar potential will be more than 750 GW and wind potential will be 410 GW [ 13 , 14 ]. To reach the ambitious targets of generating 175 GW of renewable energy by 2022, it is essential that the government creates 330,000 new jobs and livelihood opportunities [ 15 , 16 ].

A mixture of push policies and pull mechanisms, accompanied by particular strategies should promote the development of renewable energy technologies. Advancement in technology, proper regulatory policies [ 17 ], tax deduction, and attempts in efficiency enhancement due to research and development (R&D) [ 18 ] are some of the pathways to conservation of energy and environment that should guarantee that renewable resource bases are used in a cost-effective and quick manner. Hence, strategies to promote investment opportunities in the renewable energy sector along with jobs for the unskilled workers, technicians, and contractors are discussed. This article also manifests technological and financial initiatives [ 19 ], policy and regulatory framework, as well as training and educational initiatives [ 20 , 21 ] launched by the government for the growth and development of renewable energy sources. The development of renewable technology has encountered explicit obstacles, and thus, there is a need to discuss these barriers. Additionally, it is also vital to discover possible solutions to overcome these barriers, and hence, proper recommendations have been suggested for the steady growth of renewable power [ 22 , 23 , 24 ]. Given the enormous potential of renewables in the country, coherent policy measures and an investor-friendly administration might be the key drivers for India to become a global leader in clean and green energy.

Projection of global primary energy consumption

An energy source is a necessary element of socio-economic development. The increasing economic growth of developing nations in the last decades has caused an accelerated increase in energy consumption. This trend is anticipated to grow [ 25 ]. A prediction of future power consumption is essential for the investigation of adequate environmental and economic policies [ 26 ]. Likewise, an outlook to future power consumption helps to determine future investments in renewable energy. Energy supply and security have not only increased the essential issues for the development of human society but also for their global political and economic patterns [ 27 ]. Hence, international comparisons are helpful to identify past, present, and future power consumption.

Table 1 shows the primary energy consumption of the world, based on the BP Energy Outlook 2018 reports. In 2016, India’s overall energy consumption was 724 million tons of oil equivalent (Mtoe) and is expected to rise to 1921 Mtoe by 2040 with an average growth rate of 4.2% per annum. Energy consumption of various major countries comprises commercially traded fuels and modern renewables used to produce power. In 2016, India was the fourth largest energy consumer in the world after China, the USA, and the Organization for economic co-operation and development (OECD) in Europe [ 29 ].

The projected estimation of global energy consumption demonstrates that energy consumption in India is continuously increasing and retains its position even in 2035/2040 [ 28 ]. The increase in India’s energy consumption will push the country’s share of global energy demand to 11% by 2040 from 5% in 2016. Emerging economies such as China, India, or Brazil have experienced a process of rapid industrialization, have increased their share in the global economy, and are exporting enormous volumes of manufactured products to developed countries. This shift of economic activities among nations has also had consequences concerning the country’s energy use [ 30 ].

Projected primary energy consumption in India

The size and growth of a country’s population significantly affects the demand for energy. With 1.368 billion citizens, India is ranked second, of the most populous countries as of January 2019 [ 31 ]. The yearly growth rate is 1.18% and represents almost 17.74% of the world’s population. The country is expected to have more than 1.383 billion, 1.512 billion, 1.605 billion, 1.658 billion people by the end of 2020, 2030, 2040, and 2050, respectively. Each year, India adds a higher number of people to the world than any other nation and the specific population of some of the states in India is equal to the population of many countries.

The growth of India’s energy consumption will be the fastest among all significant economies by 2040, with coal meeting most of this demand followed by renewable energy. Renewables became the second most significant source of domestic power production, overtaking gas and then oil, by 2020. The demand for renewables in India will have a tremendous growth of 256 Mtoe in 2040 from 17 Mtoe in 2016, with an annual increase of 12%, as shown in Table 2 .

Table 3 shows the primary energy consumption of renewables for the BRIC countries (Brazil, Russia, India, and China) from 2016 to 2040. India consumed around 17 Mtoe of renewable energy in 2016, and this will be 256 Mtoe in 2040. It is probable that India’s energy consumption will grow fastest among all major economies by 2040, with coal contributing most in meeting this demand followed by renewables. The percentage share of renewable consumption in 2016 was 2% and is predicted to increase by 13% by 2040.

How renewable energy sources contribute to the energy demand in India

Even though India has achieved a fast and remarkable economic growth, energy is still scarce. Strong economic growth in India is escalating the demand for energy, and more energy sources are required to cover this demand. At the same time, due to the increasing population and environmental deterioration, the country faces the challenge of sustainable development. The gap between demand and supply of power is expected to rise in the future [ 32 ]. Table 4 presents the power supply status of the country from 2009–2010 to 2018–2019 (until October 2018). In 2018, the energy demand was 1,212,134 GWh, and the availability was 1,203,567 GWh, i.e., a deficit of − 0.7% [ 33 ].

According to the Load generation and Balance Report (2016–2017) of the Central Electricity Authority of India (CEA), the electrical energy demand for 2021–2022 is anticipated to be at least 1915 terawatt hours (TWh), with a peak electric demand of 298 GW [ 34 ]. Increasing urbanization and rising income levels are responsible for an increased demand for electrical appliances, i.e., an increased demand for electricity in the residential sector. The increased demand in materials for buildings, transportation, capital goods, and infrastructure is driving the industrial demand for electricity. An increased mechanization and the shift to groundwater irrigation across the country is pushing the pumping and tractor demand in the agriculture sector, and hence the large diesel and electricity demand. The penetration of electric vehicles and the fuel switch to electric and induction cook stoves will drive the electricity demand in the other sectors shown in Table 5 .

According to the International Renewable Energy Agency (IRENA), a quarter of India’s energy demand can be met with renewable energy. The country could potentially increase its share of renewable power generation to over one-third by 2030 [ 35 ].

Table 6 presents the estimated contribution of renewable energy sources to the total energy demand. MoP along with CEA in its draft national electricity plan for 2016 anticipated that with 175 GW of installed capacity of renewable power by 2022, the expected electricity generation would be 327 billion units (BUs), which would contribute to 1611 BU energy requirements. This indicates that 20.3% of the energy requirements would be fulfilled by renewable energy by 2022 and 24.2% by 2027 [ 36 ]. Figure 1 shows the ambitious new target for the share of renewable energy in India’s electricity consumption set by MoP. As per the order of revised RPO (Renewable Purchase Obligations, legal act of June 2018), the country has a target of a 21% share of renewable energy in its total electricity consumption by March 2022. In 2014, the same goal was at 15% and increased to 21% by 2018. It is India’s goal to reach 40% renewable sources by 2030.

Target share of renewable energy in India’s power consumption

Estimated renewable energy potential in India

The estimated potential of wind power in the country during 1995 [ 37 ] was found to be 20,000 MW (20 GW), solar energy was 5 × 10 15 kWh/pa, bioenergy was 17,000 MW, bagasse cogeneration was 8000 MW, and small hydropower was 10,000 MW. For 2006, the renewable potential was estimated as 85,000 MW with wind 4500 MW, solar 35 MW, biomass/bioenergy 25,000 MW, and small hydropower of 15,000 MW [ 38 ]. According to the annual report of the Ministry of New and Renewable Energy (MNRE) for 2017–2018, the estimated potential of wind power was 302.251 GW (at 100-m mast height), of small hydropower 19.749 GW, biomass power 17.536 GW, bagasse cogeneration 5 GW, waste to energy (WTE) 2.554 GW, and solar 748.990 GW. The estimated total renewable potential amounted to 1096.080 GW [ 39 ] assuming 3% wasteland, which is shown in Table 7 . India is a tropical country and receives significant radiation, and hence the solar potential is very high [ 40 , 41 , 42 ].

Gross installed capacity of renewable energy in India

As of June 2018 reports, the country intends to reach 225 GW of renewable power capacity by 2022 exceeding the target of 175 GW pledged during the Paris Agreement. The sector is the fourth most attractive renewable energy market in the world. As in October 2018, India ranked fifth in installed renewable energy capacity [ 43 ].

Gross installed capacity of renewable energy—according to region

Table 8 lists the cumulative installed capacity of both conventional and renewable energy sources. The cumulative installed capacity of renewable sources as on the 31 st of December 2018 was 74081.66 MW. Renewable energy (small hydropower, wind, biomass, WTE, solar) accounted for an approximate 21% share of the cumulative installed power capacity, and the remaining 78.791% originated from other conventional sources (coal, gas diesel, nuclear, and large hydropower) [ 44 ]. The best regions for renewable energy are the southern states that have the highest solar irradiance and wind in the country. When renewable energy alone is considered for analysis, the Southern region covers 49.121% of the cumulative installed renewable capacity, followed by the Western region (29.742%), the Northern region (18.890%), the Eastern region (1.836%), the North-Easter region 0.394%, and the Islands (0.017%). As far as conventional energy is concerned, the Western region with 33.452% ranks first and is followed by the Northern region with 28.484%, the Southern region (24.967%), the Eastern region (11.716%), the Northern-Eastern (1.366%), and the Islands (0.015%).

Gross installed capacity of renewable energy—according to ownership

State government, central government, and private players drive the Indian energy sector. The private sector leads the way in renewable energy investment. Table 9 shows the installed gross renewable energy and conventional energy capacity (percentage)—ownership wise. It is evident from Fig. 2 that 95% of the installed renewable capacity derives from private companies, 2% from the central government, and 3% from the state government. The top private companies in the field of non-conventional energy generation are Tata Power Solar, Suzlon, and ReNew Power. Tata Power Solar System Limited are the most significant integrated solar power players in the country, Suzlon realizes wind energy projects, and ReNew Power Ventures operate with solar and wind power.

Gross renewable energy installed capacity (percentage)—Ownership wise as per the 31.12.2018 [ 43 ]

Gross installed capacity of renewable energy—state wise

Table 10 shows the installed capacity of cumulative renewable energy (state wise), out of the total installed capacity of 74,081.66 MW, where Karnataka ranks first with 12,953.24 MW (17.485%), Tamilnadu second with 11,934.38 MW (16%), Maharashtra third with 9283.78 MW (12.532%), Gujarat fourth with 10.641 MW (10.641%), and Rajasthan fifth with 7573.86 MW (10.224%). These five states cover almost 66.991% of the installed capacity of total renewable. Other prominent states are Andhra Pradesh (9.829%), Madhya Pradesh (5.819%), Telangana (5.137%), and Uttar Pradesh (3.879%). These nine states cover almost 91.655%.

Gross installed capacity of renewable energy—according to source

Under union budget of India 2018–2019, INR 3762 crore (USD 581.09 million), was allotted for grid-interactive renewable power schemes and projects. As per the 31.12.2018, the installed capacity of total renewable power (excluding large hydropower) in the country amounted to 74.08166 GW. Around 9.363 GW of solar energy, 1.766 GW of wind, 0.105 GW of small hydropower (SHP), and biomass power of 8.7 GW capacity were added in 2017–2018. Table 11 shows the installed capacity of renewable energy over the last 10 years until the 31.12.2018. Wind energy continues to dominate the countries renewable energy industry, accounting for over 47% of cumulative installed renewable capacity (35,138.15 MW), followed by solar power of 34% (25,212.26 MW), biomass power/cogeneration of 12% (9075.5 MW), and small hydropower of 6% (4517.45 MW). In the renewable energy country attractiveness index (RECAI) of 2018, India ranked in fourth position. The installed renewable energy production capacity has grown at an accelerated pace over the preceding few years, posting a CAGR of 19.78% between 2014 and 2018 [ 45 ] .

Estimation of the installed capacity of renewable energy

Table 12 gives the share of installed cumulative renewable energy capacity, in comparison with the installed conventional energy capacity. In 2022 and 2032, the installed renewable energy capacity will account for 32% and 35%, respectively [ 46 , 47 ]. The most significant renewable capacity expansion program in the world is being taken up by India. The government is preparing to boost the percentage of clean energy through a tremendous push in renewables, as discussed in the subsequent sections.

Gross electricity generation from renewable energy in India

The overall generation (including the generation from grid-connected renewable sources) in the country has grown exponentially. Between 2014–2015 and 2015–2016, it achieved 1110.458 BU and 1173.603 BU, respectively. The same was recorded with 1241.689 BU and 1306.614 BU during 2015–2016 and 1306.614 BU from 2016–2017 and 2017–2018, respectively. Figure 3 indicates that the annual renewable power production increased faster than the conventional power production. The rise accounted for 6.47% in 2015–2016 and 24.88% in 2017–2018, respectively. Table 13 compares the energy generation from traditional sources with that from renewable sources. Remarkably, the energy generation from conventional sources reached 811.143 BU and from renewable sources 9.860 BU in 2010 compared to 1.206.306 BU and 88.945 BU in 2017, respectively [ 48 ]. It is observed that the price of electricity production using renewable technologies is higher than that for conventional generation technologies, but is likely to fall with increasing experience in the techniques involved [ 49 ].

The annual growth in power generation as per the 30th of November 2018

Gross electricity generation from renewable energy—according to regions

Table 14 shows the gross electricity generation from renewable energy-region wise. It is noted that the highest renewable energy generation derives from the southern region, followed by the western part. As of November 2018, 50.33% of energy generation was obtained from the southern area and 29.37%, 18.05%, 2%, and 0.24% from Western, Northern, North-Eastern Areas, and the Island, respectively.

Gross electricity generation from renewable energy—according to states

Table 15 shows the gross electricity generation from renewable energy—region-wise. It is observed that the highest renewable energy generation was achieved from Karnataka (16.57%), Tamilnadu (15.82%), Andhra Pradesh (11.92%), and Gujarat (10.87%) as per November 2018. While adding four years from 2015–2016 to 2018–2019 Tamilnadu [ 50 ] remains in the first position followed by Karnataka, Maharashtra, Gujarat and Andhra Pradesh.

Gross electricity generation from renewable energy—according to sources

Table 16 shows the gross electricity generation from renewable energy—source-wise. It can be concluded from the table that the wind-based energy generation as per 2017–2018 is most prominent with 51.71%, followed by solar energy (25.40%), Bagasse (11.63%), small hydropower (7.55%), biomass (3.34%), and WTE (0.35%). There has been a constant increase in the generation of all renewable sources from 2014–2015 to date. Wind energy, as always, was the highest contributor to the total renewable power production. The percentage of solar energy produced in the overall renewable power production comes next to wind and is typically reduced during the monsoon months. The definite improvement in wind energy production can be associated with a “good” monsoon. Cyclonic action during these months also facilitates high-speed winds. Monsoon winds play a significant part in the uptick in wind power production, especially in the southern states of the country.

Estimation of gross electricity generation from renewable energy

Table 17 shows an estimation of gross electricity generation from renewable energy based on the 2015 report of the National Institution for Transforming India (NITI Aayog) [ 51 ]. It is predicted that the share of renewable power will be 10.2% by 2022, but renewable power technologies contributed a record of 13.4% to the cumulative power production in India as of the 31st of August 2018. The power ministry report shows that India generated 122.10 TWh and out of the total electricity produced, renewables generated 16.30 TWh as on the 31st of August 2018. According to the India Brand Equity Foundation report, it is anticipated that by the year 2040, around 49% of total electricity will be produced using renewable energy.

Current achievements in renewable energy 2017–2018

India cares for the planet and has taken a groundbreaking journey in renewable energy through the last 4 years [ 52 , 53 ]. A dedicated ministry along with financial and technical institutions have helped India in the promotion of renewable energy and diversification of its energy mix. The country is engaged in expanding the use of clean energy sources and has already undertaken several large-scale sustainable energy projects to ensure a massive growth of green energy.

1. India doubled its renewable power capacity in the last 4 years. The cumulative renewable power capacity in 2013–2014 reached 35,500 MW and rose to 70,000 MW in 2017–2018.

2. India stands in the fourth and sixth position regarding the cumulative installed capacity in the wind and solar sector, respectively. Furthermore, its cumulative installed renewable capacity stands in fifth position globally as of the 31st of December 2018.

3. As said above, the cumulative renewable energy capacity target for 2022 is given as 175 GW. For 2017–2018, the cumulative installed capacity amounted to 70 GW, the capacity under implementation is 15 GW and the tendered capacity was 25 GW. The target, the installed capacity, the capacity under implementation, and the tendered capacity are shown in Fig. 4 .

4. There is tremendous growth in solar power. The cumulative installed solar capacity increased by more than eight times in the last 4 years from 2.630 GW (2013–2014) to 22 GW (2017–2018). As of the 31st of December 2018, the installed capacity amounted to 25.2122 GW.

5. The renewable electricity generated in 2017–2018 was 101839 BUs.

6. The country published competitive bidding guidelines for the production of renewable power. It also discovered the lowest tariff and transparent bidding method and resulted in a notable decrease in per unit cost of renewable energy.

7. In 21 states, there are 41 solar parks with a cumulative capacity of more than 26,144 MW that have already been approved by the MNRE. The Kurnool solar park was set up with 1000 MW; and with 2000 MW the largest solar park of Pavagada (Karnataka) is currently under installation.

8. The target for solar power (ground mounted) for 2018–2019 is given as 10 GW, and solar power (Rooftop) as 1 GW.

9. MNRE doubled the target for solar parks (projects of 500 MW or more) from 20 to 40 GW.

10. The cumulative installed capacity of wind power increased by 1.6 times in the last 4 years. In 2013–2014, it amounted to 21 GW, from 2017 to 2018 it amounted to 34 GW, and as of 31st of December 2018, it reached 35.138 GW. This shows that achievements were completed in wind power use.

11. An offshore wind policy was announced. Thirty-four companies (most significant global and domestic wind power players) competed in the “expression of interest” (EoI) floated on the plan to set up India’s first mega offshore wind farm with a capacity of 1 GW.

12. 682 MW small hydropower projects were installed during the last 4 years along with 600 watermills (mechanical applications) and 132 projects still under development.

13. MNRE is implementing green energy corridors to expand the transmission system. 9400 km of green energy corridors are completed or under implementation. The cost spent on it was INR 10141 crore (101,410 Million INR = 1425.01 USD). Furthermore, the total capacity of 19,000 MVA substations is now planned to be complete by March 2020.

14. MNRE is setting up solar pumps (off-grid application), where 90% of pumps have been set up as of today and between 2014–2015 and 2017–2018. Solar street lights were more than doubled. Solar home lighting systems have been improved by around 1.5 times. More than 2,575,000 solar lamps have been distributed to students. The details are illustrated in Fig. 5 .

15. From 2014–2015 to 2017–2018, more than 2.5 lakh (0.25 million) biogas plants were set up for cooking in rural homes to enable families by providing them access to clean fuel.

16. New policy initiatives revised the tariff policy mandating purchase and generation obligations (RPO and RGO). Four wind and solar inter-state transmission were waived; charges were planned, the RPO trajectory for 2022 and renewable energy policy was finalized.

17. Expressions of interest (EoI) were invited for installing solar photovoltaic manufacturing capacities associated with the guaranteed off-take of 20 GW. EoI indicated 10 GW floating solar energy plants.

18. Policy for the solar-wind hybrid was announced. Tender for setting up 2 GW solar-wind hybrid systems in existing projects was invited.

19. To facilitate R&D in renewable power technology, a National lab policy on testing, standardization, and certification was announced by the MNRE.

20. The Surya Mitra program was conducted to train college graduates in the installation, commissioning, operations, and management of solar panels. The International Solar Alliance (ISA) headquarters in India (Gurgaon) will be a new commencement for solar energy improvement in India.

21. The renewable sector has become considerably more attractive for foreign and domestic investors, and the country expects to attract up to USD 80 billion in the next 4 years from 2018–2019 to 2021–2022.

22. The solar power capacity expanded by more than eight times from 2.63 GW in 2013–2014 to 22 GW in 2017–2018.

23. A bidding for 115 GW renewable energy projects up to March 2020 was announced.

24. The Bureau of Indian Standards (BIS) acting for system/components of solar PV was established.

25. To recognize and encourage innovative ideas in renewable energy sectors, the Government provides prizes and awards. Creative ideas/concepts should lead to prototype development. The Name of the award is “Abhinav Soch-Nayi Sambhawanaye,” which means Innovative ideas—New possibilities.

Renewable energy target, installed capacity, under implementation and tendered [ 52 ]

Off-grid solar applications [ 52 ]

Solar energy

Under the National Solar Mission, the MNRE has updated the objective of grid-connected solar power projects from 20 GW by the year 2021–2022 to 100 GW by the year 2021–2022. In 2008–2009, it reached just 6 MW. The “Made in India” initiative to promote domestic manufacturing supported this great height in solar installation capacity. Currently, India has the fifth highest solar installed capacity worldwide. By the 31st of December 2018, solar energy had achieved 25,212.26 MW against the target of 2022, and a further 22.8 GW of capacity has been tendered out or is under current implementation. MNRE is preparing to bid out the remaining solar energy capacity every year for the periods 2018–2019 and 2019–2020 so that bidding may contribute with 100 GW capacity additions by March 2020. In this way, 2 years for the completion of projects would remain. Tariffs will be determined through the competitive bidding process (reverse e-auction) to bring down tariffs significantly. The lowest solar tariff was identified to be INR 2.44 per kWh in July 2018. In 2010, solar tariffs amounted to INR 18 per kWh. Over 100,000 lakh (10,000 million) acres of land had been classified for several planned solar parks, out of which over 75,000 acres had been obtained. As of November 2018, 47 solar parks of a total capacity of 26,694 MW were established. The aggregate capacity of 4195 MW of solar projects has been commissioned inside various solar parks (floating solar power). Table 18 shows the capacity addition compared to the target. It indicates that capacity addition increased exponentially.

Wind energy

As of the 31st of December 2018, the total installed capacity of India amounted to 35,138.15 MW compared to a target of 60 GW by 2022. India is currently in fourth position in the world for installed capacity of wind power. Moreover, around 9.4 GW capacity has been tendered out or is under current implementation. The MNRE is preparing to bid out for A 10 GW wind energy capacity every year for 2018–2019 and 2019–2020, so that bidding will allow for 60 GW capacity additions by March 2020, giving the remaining two years for the accomplishment of the projects. The gross wind energy potential of the country now reaches 302 GW at a 100 m above-ground level. The tariff administration has been changed from feed-in-tariff (FiT) to the bidding method for capacity addition. On the 8th of December 2017, the ministry published guidelines for a tariff-based competitive bidding rule for the acquisition of energy from grid-connected wind energy projects. The developed transparent process of bidding lowered the tariff for wind power to its lowest level ever. The development of the wind industry has risen in a robust ecosystem ensuring project execution abilities and a manufacturing base. State-of-the-art technologies are now available for the production of wind turbines. All the major global players in wind power have their presence in India. More than 12 different companies manufacture more than 24 various models of wind turbines in India. India exports wind turbines and components to the USA, Europe, Australia, Brazil, and other Asian countries. Around 70–80% of the domestic production has been accomplished with strong domestic manufacturing companies. Table 19 lists the capacity addition compared to the target for the capacity addition. Furthermore, electricity generation from the wind-based capacity has improved, even though there was a slowdown of new capacity in the first half of 2018–2019 and 2017–2018.

The national energy storage mission—2018

The country is working toward a National Energy Storage Mission. A draft of the National Energy Storage Mission was proposed in February 2018 and initiated to develop a comprehensive policy and regulatory framework. During the last 4 years, projects included in R&D worth INR 115.8 million (USD 1.66 million) in the domain of energy storage have been launched, and a corpus of INR 48.2 million (USD 0.7 million) has been issued. India’s energy storage mission will provide an opportunity for globally competitive battery manufacturing. By increasing the battery manufacturing expertise and scaling up its national production capacity, the country can make a substantial economic contribution in this crucial sector. The mission aims to identify the cumulative battery requirements, total market size, imports, and domestic manufacturing. Table 20 presents the economic opportunity from battery manufacturing given by the National Institution for Transforming India, also called NITI Aayog, which provides relevant technical advice to central and state governments while designing strategic and long-term policies and programs for the Indian government.

Small hydropower—3-year action agenda—2017

Hydro projects are classified as large hydro, small hydro (2 to 25 MW), micro-hydro (up to 100 kW), and mini-hydropower (100 kW to 2 MW) projects. Whereas the estimated potential of SHP is 20 GW, the 2022 target for India in SHP is 5 GW. As of the 31st of December 2018, the country has achieved 4.5 GW and this production is constantly increasing. The objective, which was planned to be accomplished through infrastructure project grants and tariff support, was included in the NITI Aayog’s 3-year action agenda (2017–2018 to 2019–2020), which was published on the 1st of August 2017. MNRE is providing central financial assistance (CFA) to set up small/micro hydro projects both in the public and private sector. For the identification of new potential locations, surveys and comprehensive project reports are elaborated, and financial support for the renovation and modernization of old projects is provided. The Ministry has established a dedicated completely automatic supervisory control and data acquisition (SCADA)—based on a hydraulic turbine R&D laboratory at the Alternate Hydro Energy Center (AHEC) at IIT Roorkee. The establishment cost for the lab was INR 40 crore (400 million INR, 95.62 Million USD), and the laboratory will serve as a design and validation facility. It investigates hydro turbines and other hydro-mechanical devices adhering to national and international standards [ 54 , 55 ]. Table 21 shows the target and achievements from 2007–2008 to 2018–2019.

National policy regarding biofuels—2018

Modernization has generated an opportunity for a stable change in the use of bioenergy in India. MNRE amended the current policy for biomass in May 2018. The policy presents CFA for projects using biomass such as agriculture-based industrial residues, wood produced through energy plantations, bagasse, crop residues, wood waste generated from industrial operations, and weeds. Under the policy, CFA will be provided to the projects at the rate of INR 2.5 million (USD 35,477.7) per MW for bagasse cogeneration and INR 5 million (USD 70,955.5) per MW for non-bagasse cogeneration. The MNRE also announced a memorandum in November 2018 considering the continuation of the concessional customs duty certificate (CCDC) to set up projects for the production of energy using non-conventional materials such as bio-waste, agricultural, forestry, poultry litter, agro-industrial, industrial, municipal, and urban wastes. The government recently established the National policy on biofuels in August 2018. The MNRE invited an expression of interest (EOI) to estimate the potential of biomass energy and bagasse cogeneration in the country. A program to encourage the promotion of biomass-based cogeneration in sugar mills and other industries was also launched in May 2018. Table 22 shows how the biomass power target and achievements are expected to reach 10 GW of the target of 2022 before the end of 2019.

The new national biogas and organic manure program (NNBOMP)—2018

The National biogas and manure management programme (NBMMP) was launched in 2012–2013. The primary objective was to provide clean gaseous fuel for cooking, where the remaining slurry was organic bio-manure which is rich in nitrogen, phosphorus, and potassium. Further, 47.5 lakh (4.75 million) cumulative biogas plants were completed in 2014, and increased to 49.8 lakh (4.98 million). During 2017–2018, the target was to establish 1.10 lakh biogas plants (1.10 million), but resulted in 0.15 lakh (0.015 million). In this way, the cost of refilling the gas cylinders with liquefied petroleum gas (LPG) was greatly reduced. Likewise, tons of wood/trees were protected from being axed, as wood is traditionally used as a fuel in rural and semi-urban households. Biogas is a viable alternative to traditional cooking fuels. The scheme generated employment for almost 300 skilled laborers for setting up the biogas plants. By 30th of May 2018, the Ministry had issued guidelines for the implementation of the NNBOMP during the period 2017–2018 to 2019–2020 [ 56 ].

The off-grid and decentralized solar photovoltaic application program—2018

The program deals with the energy demand through the deployment of solar lanterns, solar streetlights, solar home lights, and solar pumps. The plan intended to reach 118 MWp of off-grid PV capacity by 2020. The sanctioning target proposed outlay was 50 MWp by 2017–2018 and 68 MWp by 2019–2020. The total estimated cost amounted to INR 1895 crore (18950 Million INR, 265.547 million USD), and the ministry wanted to support 637 crores (6370 million INR, 89.263 million USD) by its central finance assistance. Solar power plants with a 25 KWp size were promoted in those areas where grid power does not reach households or is not reliable. Public service institutions, schools, panchayats, hostels, as well as police stations will benefit from this scheme. Solar study lamps were also included as a component in the program. Thirty percent of financial assistance was provided to solar power plants. Every student should bear 15% of the lamp cost, and the ministry wanted to support the remaining 85%. As of October 2018, lantern and lamps of more than 40 Lakhs (4 million), home lights of 16.72 lakhs (1.672 million) number, street lights of 6.40 lakhs (0.64 million), solar pumps of 1.96 lakhs (0.196 million), and 187.99 MWp stand-alone devices had been installed [ 57 , 58 ].

Major government initiatives for renewable energy

Technological initiatives.

The Technology Development and Innovation Policy (TDIP) released on the 6th of October 2017 was endeavored to promote research, development, and demonstration (RD&D) in the renewable energy sector [ 59 ]. RD&D intended to evaluate resources, progress in technology, commercialization, and the presentation of renewable energy technologies across the country. It aimed to produce renewable power devices and systems domestically. The evaluation of standards and resources, processes, materials, components, products, services, and sub-systems was carried out through RD&D. A development of the market, efficiency improvements, cost reductions, and a promotion of commercialization (scalability and bankability) were achieved through RD&D. Likewise, the percentage of renewable energy in the total electricity mix made it self-sustainable, industrially competitive, and profitable through RD&D. RD&D also supported technology development and demonstration in wind, solar, wind-solar hybrid, biofuel, biogas, hydrogen fuel cells, and geothermal energies. RD&D supported the R&D units of educational institutions, industries, and non-government organizations (NGOs). Sharing expertise, information, as well as institutional mechanisms for collaboration was realized by use of the technology development program (TDP). The various people involved in this program were policymakers, industrial innovators, associated stakeholders and departments, researchers, and scientists. Renowned R&D centers in India are the National Institute of Solar Energy (NISE), Gurgaon, the National Institute of Bio-Energy (NIBE), Kapurthala, and the National Institute of Wind Energy (NIWE), Chennai. The TDP strategy encouraged the exploration of innovative approaches and possibilities to obtain long-term targets. Likewise, it efficiently supported the transformation of knowledge into technology through a well-established monitoring system for the development of renewable technology that meets the electricity needs of India. The research center of excellence approved the TDI projects, which were funded to strengthen R&D. Funds were provided for conducting training and workshops. The MNRE is now preparing a database of R&D accomplishments in the renewable energy sector.

The Impacting Research Innovation and Technology (IMPRINT) program seeks to develop engineering and technology (prototype/process development) on a national scale. IMPRINT is steered by the Indian Institute of Technologies (IITs) and Indian Institute of science (IISCs). The expansion covers all areas of engineering and technology including renewable technology. The ministry of human resource development (MHRD) finances up to 50% of the total cost of the project. The remaining costs of the project are financed by the ministry (MNRE) via the RD&D program for renewable projects. Currently (2018–2019), five projects are under implementation in the area of solar thermal systems, storage for SPV, biofuel, and hydrogen and fuel cells which are funded by the MNRE (36.9 million INR, 0.518426 Million USD) and IMPRINT. Development of domestic technology and quality control are promoted through lab policies that were published on the 7th of December 2017. Lab policies were implemented to test, standardize, and certify renewable energy products and projects. They supported the improvement of the reliability and quality of the projects. Furthermore, Indian test labs are strengthened in line with international standards and practices through well-established lab policies. From 2015, the MNRE has provided “The New and Renewable Energy Young Scientist’s Award” to researchers/scientists who demonstrate exceptional accomplishments in renewable R&D.

Financial initiatives

One hundred percent financial assistance is granted by the MNRE to the government and NGOs and 50% financial support to the industry. The policy framework was developed to guide the identification of the project, the formulation, monitoring appraisal, approval, and financing. Between 2012 and 2017, a 4467.8 million INR, 62.52 Million USD) support was granted by the MNRE. The MNRE wanted to double the budget for technology development efforts in renewable energy for the current three-year plan period. Table 23 shows that the government is spending more and more for the development of the renewable energy sector. Financial support was provided to R&D projects. Exceptional consideration was given to projects that worked under extreme and hazardous conditions. Furthermore, financial support was applied to organizing awareness programs, demonstrations, training, workshops, surveys, assessment studies, etc. Innovative approaches will be rewarded with cash prizes. The winners will be presented with a support mechanism for transforming their ideas and prototypes into marketable commodities such as start-ups for entrepreneur development. Innovative projects will be financed via start-up support mechanisms, which will include an investment contract with investors. The MNRE provides funds to proposals for investigating policies and performance analyses related to renewable energy.

Technology validation and demonstration projects and other innovative projects with regard to renewables received a financial assistance of 50% of the project cost. The CFA applied to partnerships with industry and private institutions including engineering colleges. Private academic institutions, accredited by a government accreditation body, were also eligible to receive a 50% support. The concerned industries and institutions should meet the remaining 50% expenditure. The MNRE allocated an INR 3762.50 crore (INR 37625 million, 528.634 million USD) for the grid interactive renewable sources and an INR 1036.50 crore (INR 10365 million, 145.629 million USD) for off-grid/distributed and decentralized renewable power for the year 2018–2019 [ 60 ]. The MNRE asked the Reserve Bank of India (RBI), attempting to build renewable power projects under “priority sector lending” (priority lending should be done for renewable energy projects and without any limit) and to eliminate the obstacles in the financing of renewable energy projects. In July 2018, the Ministry of Finance announced that it would impose a 25% safeguard duty on solar panels and modules imported from China and Malaysia for 1 year. The quantum of tax might be reduced to 20% for the next 6 months, and 15% for the following 6 months.

Policy and regulatory framework initiatives

The regulatory interventions for the development of renewable energy sources are (a) tariff determination, (b) defining RPO, (c) promoting grid connectivity, and (d) promoting the expansion of the market.

Tariff policy amendments—2018

On the 30th of May 2018, the MoP released draft amendments to the tariff policy. The objective of these policies was to promote electricity generation from renewables. MoP in consultation with MNRE announced the long-term trajectory for RPO, which is represented in Table 24 . The State Electricity Regulatory Commission (SERC) achieved a favorable and neutral/off-putting effect in the growth of the renewable power sector through their RPO regulations in consultation with the MNRE. On the 25th of May 2018, the MNRE created an RPO compliance cell to reach India’s solar and wind power goals. Due to the absence of implementation of RPO regulations, several states in India did not meet their specified RPO objectives. The cell will operate along with the Central Electricity Regulatory Commission (CERC) and SERCs to obtain monthly statements on RPO compliance. It will also take up non-compliance associated concerns with the relevant officials.

Repowering policy—2016

On the 09th of August 2016, India announced a “repowering policy” for wind energy projects. An about 27 GW turnaround was possible according to the policy. This policy supports the replacing of aging wind turbines with more modern and powerful units (fewer, larger, taller) to raise the level of electricity generation. This policy seeks to create a simplified framework and to promote an optimized use of wind power resources. It is mandatory because the up to the year 2000 installed wind turbines were below 500 kW in sites where high wind potential might be achieved. It will be possible to obtain 3000 MW from the same location once replacements are in place. The policy was initially applied for the one MW installed capacity of wind turbines, and the MNRE will extend the repowering policy to other projects in the future based on experience. Repowering projects were implemented by the respective state nodal agencies/organizations that were involved in wind energy promotion in their states. The policy provided an exception from the Power Purchase Agreement (PPA) for wind farms/turbines undergoing repowering because they could not fulfill the requirements according to the PPA during repowering. The repowering projects may avail accelerated depreciation (AD) benefit or generation-based incentive (GBI) due to the conditions appropriate to new wind energy projects [ 61 ].

The wind-solar hybrid policy—2018

On the 14th of May 2018, the MNRE announced a national wind-solar hybrid policy. This policy supported new projects (large grid-connected wind-solar photovoltaic hybrid systems) and the hybridization of the already available projects. These projects tried to achieve an optimal and efficient use of transmission infrastructure and land. Better grid stability was achieved and the variability in renewable power generation was reduced. The best part of the policy intervention was that which supported the hybridization of existing plants. The tariff-based transparent bidding process was included in the policy. Regulatory authorities should formulate the necessary standards and regulations for hybrid systems. The policy also highlighted a battery storage in hybrid projects for output optimization and variability reduction [ 62 ].

The national offshore wind energy policy—2015

The National Offshore Wind Policy was released in October 2015. On the 19th of June 2018, the MNRE announced a medium-term target of 5 GW by 2022 and a long-term target of 30 GW by 2030. The MNRE called expressions of Interest (EoI) for the first 1 GW of offshore wind (the last date was 08.06.2018). The EoI site is located in Pipavav port at the Gulf of Khambhat at a distance of 23 km facilitating offshore wind (FOWIND) where the consortium deployed light detection and ranging (LiDAR) in November 2017). Pipavav port is situated off the coast of Gujarat. The MNRE had planned to install more such equipment in the states of Tamil Nadu and Gujarat. On the 14 th of December 2018, the MNRE, through the National Institute of Wind Energy (NIWE), called tender for offshore environmental impact assessment studies at intended LIDAR points at the Gulf of Mannar, off the coast of Tamil Nadu for offshore wind measurement. The timeline for initiatives was to firstly add 500 MW by 2022, 2 to 2.5 GW by 2027, and eventually reaching 5 GW between 2028 and 2032. Even though the installation of large wind power turbines in open seas is a challenging task, the government has endeavored to promote this offshore sector. Offshore wind energy would add its contribution to the already existing renewable energy mix for India [ 63 ] .

The feed-in tariff policy—2018

On the 28th of January 2016, the revised tariff policy was notified following the Electricity Act. On the 30th May 2018, the amendment in tariff policy was released. The intentions of this tariff policy are (a) an inexpensive and competitive electricity rate for the consumers; (b) to attract investment and financial viability; (c) to ensure that the perceptions of regulatory risks decrease through predictability, consistency, and transparency of policy measures; (d) development in quality of supply, increased operational efficiency, and improved competition; (e) increase the production of electricity from wind, solar, biomass, and small hydro; (f) peaking reserves that are acceptable in quantity or consistently good in quality or performance of grid operation where variable renewable energy source integration is provided through the promotion of hydroelectric power generation, including pumped storage projects (PSP); (g) to achieve better consumer services through efficient and reliable electricity infrastructure; (h) to supply sufficient and uninterrupted electricity to every level of consumers; and (i) to create adequate capacity, reserves in the production, transmission, and distribution that is sufficient for the reliability of supply of power to customers [ 64 ].

Training and educational initiatives

The MHRD has developed strong renewable energy education and training systems. The National Council for Vocational Training (NCVT) develops course modules, and a Modular Employable Skilling program (MES) in its regular 2-year syllabus to include SPV lighting systems, solar thermal systems, SHP, and provides the certificate for seven trades after the completion of a 2-year course. The seven trades are plumber, fitter, carpenter, welder, machinist, and electrician. The Ministry of Skill Development and Entrepreneurship (MSDE) worked out a national skill development policy in 2015. They provide regular training programs to create various job roles in renewable energy along with the MNRE support through a skill council for green jobs (SCGJ), the National Occupational Standards (NOS), and the Qualification Pack (QP). The SCGJ is promoted by the Confederation of Indian Industry (CII) and the MNRE. The industry partner for the SCGJ is ReNew Power [ 65 , 66 ].

The global status of India in renewable energy

Table 25 shows the RECAI (Renewable Energy Country Attractiveness Index) report of 40 countries. This report is based on the attractiveness of renewable energy investment and deployment opportunities. RECAI is based on macro vitals such as economic stability, investment climate, energy imperatives such as security and supply, clean energy gap, and affordability. It also includes policy enablement such as political stability and support for renewables. Its emphasis lies on project delivery parameters such as energy market access, infrastructure, and distributed generation, finance, cost and availability, and transaction liquidity. Technology potentials such as natural resources, power take-off attractiveness, potential support, technology maturity, and forecast growth are taken into consideration for ranking. India has moved to the fourth position of the RECAI-2018. Indian solar installations (new large-scale and rooftop solar capacities) in the calendar year 2017 increased exponentially with the addition of 9629 MW, whereas in 2016 it was 4313 MW. The warning of solar import tariffs and conflicts between developers and distribution firms are growing investor concerns [ 67 ]. Figure 6 shows the details of the installed capacity of global renewable energy in 2016 and 2017. Globally, 2017 GW renewable energy was installed in 2016, and in 2017, it increased to 2195 GW. Table 26 shows the total capacity addition of top countries until 2017. The country ranked fifth in renewable power capacity (including hydro energy), renewable power capacity (not including hydro energy) in fourth position, concentrating solar thermal power (CSP) and wind power were also in fourth position [ 68 ].

Globally installed capacity of renewable energy in 2017—Global 2018 status report with regard to renewables [ 68 ]

The investment opportunities in renewable energy in India

The investments into renewable energy in India increased by 22% in the first half of 2018 compared to 2017, while the investments in China dropped by 15% during the same period, according to a statement by the Bloomberg New Energy Finance (BNEF), which is shown in Table 27 [ 69 , 70 ]. At this rate, India is expected to overtake China and become the most significant growth market for renewable energy by the end of 2020. The country is eyeing pole position for transformation in renewable energy by reaching 175 GW by 2020. To achieve this target, it is quickly ramping up investments in this sector. The country added more renewable capacity than conventional capacity in 2018 when compared to 2017. India hosted the ISA first official summit on the 11.03.2018 for 121 countries. This will provide a standard platform to work toward the ambitious targets for renewable energy. The summit will emphasize India’s dedication to meet global engagements in a time-bound method. The country is also constructing many sizeable solar power parks comparable to, but larger than, those in China. Half of the earth’s ten biggest solar parks under development are in India.

In 2014, the world largest solar park was the Topaz solar farm in California with a 550 MW facility. In 2015, another operator in California, Solar Star, edged its capacity up to 579 MW. By 2016, India’s Kamuthi Solar Power Project in Tamil Nadu was on top with 648 MW of capacity (set up by the Adani Green Energy, part of the Adani Group, in Tamil Nadu). As of February 2017, the Longyangxia Dam Solar Park in China was the new leader, with 850 MW of capacity [ 71 ]. Currently, there are 600 MW operating units and 1400 MW units under construction. The Shakti Sthala solar park was inaugurated on 01.03.2018 in Pavagada (Karnataka, India) which is expected to become the globe’s most significant solar park when it accomplishes its full potential of 2 GW. Another large solar park with 1.5 GW is scheduled to be built in the Kadappa region [ 72 ]. The progress in solar power is remarkable and demonstrates real clean energy development on the ground.

The Kurnool ultra-mega solar park generated 800 million units (MU) of energy in October 2018 and saved over 700,000 tons of CO 2 . Rainwater was harvested using a reservoir that helps in cleaning solar panels and supplying water. The country is making remarkable progress in solar energy. The Kamuthi solar farm is cleaned each day by a robotic system. As the Indian economy expands, electricity consumption is forecasted to reach 15,280 TWh in 2040. With the government’s intent, green energy objectives, i.e., the renewable sector, grow considerably in an attractive manner with both foreign and domestic investors. It is anticipated to attract investments of up to USD 80 billion in the subsequent 4 years. The government of India has raised its 175 GW target to 225 GW of renewable energy capacity by 2022. The competitive benefit is that the country has sun exposure possible throughout the year and has an enormous hydropower potential. India was also listed fourth in the EY renewable energy country attractive index 2018. Sixty solar cities will be built in India as a section of MNRE’s “Solar cities” program.

In a regular auction, reduction in tariffs cost of the projects are the competitive benefits in the country. India accounts for about 4% of the total global electricity generation capacity and has the fourth highest installed capacity of wind energy and the third highest installed capacity of CSP. The solar installation in India erected during 2015–2016, 2016–2017, 2017–2018, and 2018–2019 was 3.01 GW, 5.52 GW, 9.36 GW, and 6.53 GW, respectively. The country aims to add 8.5 GW during 2019–2020. Due to its advantageous location in the solar belt (400 South to 400 North), the country is one of the largest beneficiaries of solar energy with relatively ample availability. An increase in the installed capacity of solar power is anticipated to exceed the installed capacity of wind energy, approaching 100 GW by 2022 from its current levels of 25.21226 GW as of December 2018. Fast falling prices have made Solar PV the biggest market for new investments. Under the Union Budget 2018–2019, a zero import tax on parts used in manufacturing solar panels was launched to provide an advantage to domestic solar panel companies [ 73 ].

Foreign direct investment (FDI) inflows in the renewable energy sector of India between April 2000 and June 2018 amounted to USD 6.84 billion according to the report of the department of industrial policy and promotion (DIPP). The DIPP was renamed (gazette notification 27.01.2019) the Department for the Promotion of Industry and Internal Trade (DPIIT). It is responsible for the development of domestic trade, retail trade, trader’s welfare including their employees as well as concerns associated with activities in facilitating and supporting business and startups. Since 2014, more than 42 billion USD have been invested in India’s renewable power sector. India reached US$ 7.4 billion in investments in the first half of 2018. Between April 2015 and June 2018, the country received USD 3.2 billion FDI in the renewable sector. The year-wise inflows expanded from USD 776 million in 2015–2016 to USD 783 million in 2016–2017 and USD 1204 million in 2017–2018. Between January to March of 2018, the INR 452 crore (4520 Million INR, 63.3389 million USD) of the FDI had already come in. The country is contributing with financial and promotional incentives that include a capital subsidy, accelerated depreciation (AD), waiver of inter-state transmission charges and losses, viability gap funding (VGF), and FDI up to 100% under the automated track.

The DIPP/DPIIT compiles and manages the data of the FDI equity inflow received in India [ 74 ]. The FDI equity inflow between April 2015 and June 2018 in the renewable sector is illustrated in Fig. 7 . It shows that the 2018–2019 3 months’ FDI equity inflow is half of that of the entire one of 2017–2018. It is evident from the figure that India has well-established FDI equity inflows. The significant FDI investments in the renewable energy sectors are shown in Table 28 . The collaboration between the Asian development bank and Renew Power Ventures private limited with 44.69 million USD ranked first followed by AIRRO Singapore with Diligent power with FDI equity inflow of 44.69 USD million.

The FDI equity inflow received between April 2015 and June 2018 in the renewable energy sector [ 73 ]

Strategies to promote investments

Strategies to promote investments (including FDI) by investors in the renewable sector:

Decrease constraints on FDI; provide open, transparent, and dependable conditions for foreign and domestic firms; and include ease of doing business, access to imports, comparatively flexible labor markets, and safeguard of intellectual property rights.

Establish an investment promotion agency (IPA) that targets suitable foreign investors and connects them as a catalyst with the domestic economy. Assist the IPA to present top-notch infrastructure and immediate access to skilled workers, technicians, engineers, and managers that might be needed to attract such investors. Furthermore, it should involve an after-investment care, recognizing the demonstration effects from satisfied investors, the potential for reinvestments, and the potential for cluster-development due to follow-up investments.

It is essential to consider the targeted sector (wind, solar, SPH or biomass, respectively) for which investments are required.

Establish the infrastructure needed for a quality investor, including adequate close-by transport facilities (airport, ports), a sufficient and steady supply of energy, a provision of a sufficiently skilled workforce, the facilities for the vocational training of specialized operators, ideally designed in collaboration with the investor.

Policy and other support mechanisms such as Power Purchase Agreements (PPA) play an influential role in underpinning returns and restricting uncertainties for project developers, indirectly supporting the availability of investment. Investors in renewable energy projects have historically relied on government policies to give them confidence about the costs necessary for electricity produced—and therefore for project revenues. Reassurance of future power costs for project developers is secured by signing a PPA with either a utility or an essential corporate buyer of electricity.

FiT have been the most conventional approach around the globe over the last decade to stimulate investments in renewable power projects. Set by the government concerned, they lay down an electricity tariff that developers of qualifying new projects might anticipate to receive for the resulting electricity over a long interval (15–20 years). These present investors in the tax equity of renewable power projects with a credit that they can manage to offset the tax burden outside in their businesses.

Table 29 presents the 2018 renewable energy investment report, source-wise, by the significant players in renewables according to the report of the Bloomberg New Energy Finance Report 2018. As per this report, global investment in renewable energy was USD of 279.8 billion in 2017. The top ten in the total global investments are China (126.1 $BN), the USA (40.5 $BN), Japan (13.4 $BN), India (10.9 $BN), Germany (10.4 $BN), Australia (8.5 $BN), UK (7.6 $BN), Brazil (6.0 $BN), Mexico (6.0 $BN), and Sweden (3.7 $BN) [ 75 ]. This achievement was possible since those countries have well-established strategies for promoting investments [ 76 , 77 ].

The appropriate objectives for renewable power expansion and investments are closely related to the Nationally Determined Contributions (NDCs) objectives, the implementation of the NDC, on the road to achieving Paris promises, policy competence, policy reliability, market absorption capacity, and nationwide investment circumstances that are the real purposes for renewable power expansion, which is a significant factor for the investment strategies, as is shown in Table 30 .

The demand for investments for building a Paris-compatible and climate-resilient energy support remains high, particularly in emerging nations. Future investments in energy grids and energy flexibility are of particular significance. The strategies and the comparison chart between China, India, and the USA are presented in Table 31 .

Table 32 shows France in the first place due to overall favorable conditions for renewables, heading the G20 in investment attractiveness of renewables. Germany drops back one spot due to a decline in the quality of the global policy environment for renewables and some insufficiencies in the policy design, as does the UK. Overall, with four European countries on top of the list, Europe, however, directs the way in providing attractive conditions for investing in renewables. Despite high scores for various nations, no single government is yet close to growing a role model. All countries still have significant room for increasing investment demands to deploy renewables at the scale required to reach the Paris objectives. The table shown is based on the Paris compatible long-term vision, the policy environment for renewable energy, the conditions for system integration, the market absorption capacity, and general investment conditions. India moved from the 11th position to the 9th position in overall investments between 2017 and 2018.

A Paris compatible long-term vision includes a de-carbonization plan for the power system, the renewable power ambition, the coal and oil decrease, and the reliability of renewables policies. Direct support policies include medium-term certainty of policy signals, streamlined administrative procedures, ensuring project realization, facilitating the use of produced electricity. Conditions for system integration include system integration-grid codes, system integration-storage promotion, and demand-side management policies. A market absorption capacity includes a prior experience with renewable technologies, a current activity with renewable installations, and a presence of major renewable energy companies. General investment conditions include non-financial determinants, depth of the financial sector as well, as an inflation forecast.

Employment opportunities for citizens in renewable energy in India

Global employment scenario.

According to the 2018 Annual review of the IRENA [ 78 ], global renewable energy employment touched 10.3 million jobs in 2017, an improvement of 5.3% compared with the quantity published in 2016. Many socio-economic advantages derive from renewable power, but employment continues to be exceptionally centralized in a handful of countries, with China, Brazil, the USA, India, Germany, and Japan in the lead. In solar PV employment (3.4 million jobs), China is the leader (65% of PV Jobs) which is followed by Japan, USA, India, Bangladesh, Malaysia, Germany, Philippines, and Turkey. In biofuels employment (1.9 million jobs), Brazil is the leader (41% of PV Jobs) followed by the USA, Colombia, Indonesia, Thailand, Malaysia, China, and India. In wind employment (1.1 million jobs), China is the leader (44% of PV Jobs) followed by Germany, USA, India, UK, Brazil, Denmark, Netherlands, France, and Spain.

Table 33 shows global renewable energy employment in the corresponding technology branches. As in past years, China maintained the most notable number of people employed (3880 million jobs) estimating for 43% of the globe’s total which is shown in Fig. 8 . In India, new solar installations touched a record of 9.6 GW in 2017, efficiently increasing the total installed capacity. The employment in solar PV improved by 36% and reached 164,400 jobs, of which 92,400 represented on-grid use. IRENA determines that the building and installation covered 46% of these jobs, with operations and maintenance (O&M) representing 35% and 19%, individually. India does not produce solar PV because it could be imported from China, which is inexpensive. The market share of domestic companies (Indian supplier to renewable projects) declined from 13% in 2014–2015 to 7% in 2017–2018. If India starts the manufacturing base, more citizens will get jobs in the manufacturing field. India had the world’s fifth most significant additions of 4.1 GW to wind capacity in 2017 and the fourth largest cumulative capacity in 2018. IRENA predicts that jobs in the wind sector stood at 60,500.

Renewable energy employment in selected countries [ 79 ]

The jobs in renewables are categorized into technological development, installation/de-installation, operation, and maintenance. Tables 34 , 35 , 36 , and 37 show the wind industry, solar energy, biomass, and small hydro-related jobs in project development, component manufacturing, construction, operations, and education, training, and research. As technology quickly evolves, workers in all areas need to update their skills through continuing training/education or job training, and in several cases could benefit from professional certification. The advantages of moving to renewable energy are evident, and for this reason, the governments are responding positively toward the transformation to clean energy. Renewable energy can be described as the country’s next employment boom. Renewable energy job opportunities can transform rural economy [ 79 , 80 ]. The renewable energy sector might help to reduce poverty by creating better employment. For example, wind power is looking for specialists in manufacturing, project development, and construction and turbine installation as well as financial services, transportation and logistics, and maintenance and operations.

The government is building more renewable energy power plants that will require a workforce. The increasing investments in the renewable energy sector have the potential to provide more jobs than any other fossil fuel industry. Local businesses and renewable sectors will benefit from this change, as income will increase significantly. Many jobs in this sector will contribute to fixed salaries, healthcare benefits, and skill-building opportunities for unskilled and semi-skilled workers. A range of skilled and unskilled jobs are included in all renewable energy technologies, even though most of the positions in the renewable energy industry demand a skilled workforce. The renewable sector employs semi-skilled and unskilled labor in the construction, operations, and maintenance after proper training. Unskilled labor is employed as truck drivers, guards, cleaning, and maintenance. Semi-skilled labor is used to take regular readings from displays. A lack of consistent data on the potential employment impact of renewables expansion makes it particularly hard to assess the quantity of skilled, semi-skilled, and unskilled personnel that might be needed.

Key findings in renewable energy employment

The findings comprise (a) that the majority of employment in the renewable sector is contract based, and that employees do not benefit from permanent jobs or security. (b) Continuous work in the industry has the potential to decrease poverty. (c) Most poor citizens encounter obstacles to entry-level training and the employment market due to lack of awareness about the jobs and the requirements. (d) Few renewable programs incorporate developing ownership opportunities for the citizens and the incorporation of women in the sector. (e) The inadequacy of data makes it challenging to build relationships between employment in renewable energy and poverty mitigation.

Recommendations for renewable energy employment

When building the capacity, focus on poor people and individuals to empower them with training in operation and maintenance.

Develop and offer training programs for citizens with minimal education and training, who do not fit current programs, which restrict them from working in renewable areas.

Include women in the renewable workforce by providing localized training.

Establish connections between training institutes and renewable power companies to guarantee that (a) trained workers are placed in appropriate positions during and after the completion of the training program and (b) training programs match the requirements of the renewable sector.

Poverty impact assessments might be embedded in program design to know how programs motivate poverty reduction, whether and how they influence the community.

Allow people to have a sense of ownership in renewable projects because this could contribute to the growth of the sector.

The details of the job being offered (part time, full time, contract-based), the levels of required skills for the job (skilled, semi-skilled and unskilled), the socio-economic status of the employee data need to be collected for further analysis.

Conduct investigations, assisted by field surveys, to learn about the influence of renewable energy jobs on poverty mitigation and differences in the standard of living.

Challenges faced by renewable energy in India

The MNRE has been taking dedicated measures for improving the renewable sector, and its efforts have been satisfactory in recognizing various obstacles.

Policy and regulatory obstacles

A comprehensive policy statement (regulatory framework) is not available in the renewable sector. When there is a requirement to promote the growth of particular renewable energy technologies, policies might be declared that do not match with the plans for the development of renewable energy.

The regulatory framework and procedures are different for every state because they define the respective RPOs (Renewable Purchase Obligations) and this creates a higher risk of investments in this sector. Additionally, the policies are applicable for just 5 years, and the generated risk for investments in this sector is apparent. The biomass sector does not have an established framework.

Incentive accelerated depreciation (AD) is provided to wind developers and is evident in developing India’s wind-producing capacity. Wind projects installed more than 10 years ago show that they are not optimally maintained. Many owners of the asset have built with little motivation for tax benefits only. The policy framework does not require the maintenance of the wind projects after the tax advantages have been claimed. There is no control over the equipment suppliers because they undertake all wind power plant development activities such as commissioning, operation, and maintenance. Suppliers make the buyers pay a premium and increase the equipment cost, which brings burden to the buyer.

Furthermore, ready-made projects are sold to buyers. The buyers are susceptible to this trap to save income tax. Foreign investors hesitate to invest because they are exempted from the income tax.

Every state has different regulatory policy and framework definitions of an RPO. The RPO percentage specified in the regulatory framework for various renewable sources is not precise.

RPO allows the SERCs and certain private firms to procure only a part of their power demands from renewable sources.

RPO is not imposed on open access (OA) and captive consumers in all states except three.

RPO targets and obligations are not clear, and the RPO compliance cell has just started on 22.05.2018 to collect the monthly reports on compliance and deal with non-compliance issues with appropriate authorities.

Penalty mechanisms are not specified and only two states in India (Maharashtra and Rajasthan) have some form of penalty mechanisms.

The parameter to determine the tariff is not transparent in the regulatory framework and many SRECs have established a tariff for limited periods. The FiT is valid for only 5 years, and this affects the bankability of the project.

Many SERCs have not decided on adopting the CERC tariff that is mentioned in CERCs regulations that deal with terms and conditions for tariff determinations. The SERCs have considered the plant load factor (PLF) because it varies across regions and locations as well as particular technology. The current framework does not fit to these issues.

Third party sale (TPS) is not allowed because renewable generators are not allowed to sell power to commercial consumers. They have to sell only to industrial consumers. The industrial consumers have a low tariff and commercial consumers have a high tariff, and SRCS do not allow OA. This stops the profit for the developers and investors.

Institutional obstacles

Institutes, agencies stakeholders who work under the conditions of the MNRE show poor inter-institutional coordination. The progress in renewable energy development is limited by this lack of cooperation, coordination, and delays. The delay in implementing policies due to poor coordination, decrease the interest of investors to invest in this sector.

The single window project approval and clearance system is not very useful and not stable because it delays the receiving of clearances for the projects ends in the levy of a penalty on the project developer.

Pre-feasibility reports prepared by concerned states have some deficiency, and this may affect the small developers, i.e., the local developers, who are willing to execute renewable projects.

The workforce in institutes, agencies, and ministries is not sufficient in numbers.

Proper or well-established research centers are not available for the development of renewable infrastructure.

Customer care centers to guide developers regarding renewable projects are not available.

Standards and quality control orders have been issued recently in 2018 and 2019 only, and there are insufficient institutions and laboratories to give standards/certification and validate the quality and suitability of using renewable technology.

Financial and fiscal obstacles

There are a few budgetary constraints such as fund allocation, and budgets that are not released on time to fulfill the requirement of developing the renewable sector.

The initial unit capital costs of renewable projects are very high compared to fossil fuels, and this leads to financing challenges and initial burden.

There are uncertainties related to the assessment of resources, lack of technology awareness, and high-risk perceptions which lead to financial barriers for the developers.

The subsidies and incentives are not transparent, and the ministry might reconsider subsidies for renewable energy because there was a sharp fall in tariffs in 2018.

Power purchase agreements (PPA) signed between the power purchaser and power generators on pre-determined fixed tariffs are higher than the current bids (Economic survey 2017–2018 and union budget on the 01.02.2019). For example, solar power tariff dropped to 2.44 INR (0. 04 USD) per unit in May 2017, wind power INR 3.46 per unit in February 2017, and 2.64 INR per unit in October 2017.

Investors feel that there is a risk in the renewable sector as this sector has lower gross returns even though these returns are relatively high within the market standards.

There are not many developers who are interested in renewable projects. While newly established developers (small and local developers) do not have much of an institutional track record or financial input, which are needed to develop the project (high capital cost). Even moneylenders consider it risky and are not ready to provide funding. Moneylenders look exclusively for contractors who have much experience in construction, well-established suppliers with proven equipment and operators who have more experience.

If the performance of renewable projects, which show low-performance, faces financial obstacles, they risks the lack of funding of renewable projects.

Financial institutions such as government banks or private banks do not have much understanding or expertise in renewable energy projects, and this imposes financial barriers to the projects.

Delay in payment by the SERCs to the developers imposes debt burden on the small and local developers because moneylenders always work with credit enhancement mechanisms or guarantee bonds signed between moneylenders and the developers.

Market obstacles

Subsidies are adequately provided to conventional fossil fuels, sending the wrong impression that power from conventional fuels is of a higher priority than that from renewables (unfair structure of subsidies)

There are four renewable markets in India, the government market (providing budgetary support to projects and purchase the output of the project), the government-driven market (provide budgetary support or fiscal incentives to promote renewable energy), the loan market (taking loan to finance renewable based applications), and the cash market (buying renewable-based applications to meet personal energy needs by individuals). There is an inadequacy in promoting the loan market and cash market in India.

The biomass market is facing a demand-supply gap which results in a continuous and dramatic increase in biomass prices because the biomass supply is unreliable (and, as there is no organized market for fuel), and the price fluctuations are very high. The type of biomass is not the same in all the states of India, and therefore demand and price elasticity is high for biomass.

Renewable power was calculated based on cost-plus methods (adding direct material cost, direct labor cost, and product overhead cost). This does not include environmental cost and shields the ecological benefits of clean and green energy.

There is an inadequate evacuation infrastructure and insufficient integration of the grid, which affects the renewable projects. SERCs are not able to use all generated power to meet the needs because of the non-availability of a proper evacuation infrastructure. This has an impact on the project, and the SERCs are forced to buy expensive power from neighbor states to fulfill needs.

Extending transmission lines is not possible/not economical for small size projects, and the seasonality of generation from such projects affect the market.

There are few limitations in overall transmission plans, distribution CapEx plans, and distribution licenses for renewable power. Power evacuation infrastructure for renewable energy is not included in the plans.

Even though there is an increase in capacity for the commercially deployed renewable energy technology, there is no decline in capital cost. This cost of power also remains high. The capital cost quoted by the developers and providers of equipment is too high due to exports of machinery, inadequate built up capacity, and cartelization of equipment suppliers (suppliers join together to control prices and limit competition).

There is no adequate supply of land, for wind, solar, and solar thermal power plants, which lead to poor capacity addition in many states.

Technological obstacles

Every installation of a renewable project contributes to complex risk challenges from environmental uncertainties, natural disasters, planning, equipment failure, and profit loss.

MNRE issued the standardization of renewable energy projects policy on the 11th of December 2017 (testing, standardization, and certification). They are still at an elementary level as compared to international practices. Quality assurance processes are still under starting conditions. Each success in renewable energy is based on concrete action plans for standards, testing and certification of performance.

The quality and reliability of manufactured components, imported equipment, and subsystems is essential, and hence quality infrastructure should be established. There is no clear document related to testing laboratories, referral institutes, review mechanism, inspection, and monitoring.

There are not many R&D centers for renewables. Methods to reduce the subsidies and invest in R&D lagging; manufacturing facilities are just replicating the already available technologies. The country is dependent on international suppliers for equipment and technology. Spare parts are not manufactured locally and hence they are scarce.

Awareness, education, and training obstacles

There is an unavailability of appropriately skilled human resources in the renewable energy sector. Furthermore, it faces an acute workforce shortage.

After installation of renewable project/applications by the suppliers, there is no proper follow-up or assistance for the workers in the project to perform maintenance. Likewise, there are not enough trained and skilled persons for demonstrating, training, operation, and maintenance of the plant.

There is inadequate knowledge in renewables, and no awareness programs are available to the general public. The lack of awareness about the technologies is a significant obstacle in acquiring vast land for constructing the renewable plant. Moreover, people using agriculture lands are not prepared to give their land to construct power plants because most Indians cultivate plants.

The renewable sector depends on the climate, and this varying climate also imposes less popularity of renewables among the people.

The per capita income is low, and the people consider that the cost of renewables might be high and they might not be able to use renewables.

The storage system increases the cost of renewables, and people believe it too costly and are not ready to use them.

The environmental benefits of renewable technologies are not clearly understood by the people and negative perceptions are making renewable technologies less prevalent among them.

Environmental obstacles

A single wind turbine does not occupy much space, but many turbines are placed five to ten rotor diameters from each other, and this occupies more area, which include roads and transmission lines.

In the field of offshore wind, the turbines and blades are bigger than onshore wind turbines, and they require a substantial amount of space. Offshore installations affect ocean activities (fishing, sand extraction, gravel extraction, oil extraction, gas extraction, aquaculture, and navigation). Furthermore, they affect fish and other marine wildlife.

Wind turbines influence wildlife (birds and bats) because of the collisions with them and due to air pressure changes caused by wind turbines and habitat disruption. Making wind turbines motionless during times of low wind can protect birds and bats but is not practiced.

Sound (aerodynamic, mechanical) and visual impacts are associated with wind turbines. There is poor practice by the wind turbine developers regarding public concerns. Furthermore, there are imperfections in surfaces and sound—absorbent material which decrease the noise from turbines. The shadow flicker effect is not taken as severe environmental impact by the developers.

Sometimes wind turbine material production, transportation of materials, on-site construction, assembling, operation, maintenance, dismantlement, and decommissioning may be associated with global warming, and there is a lag in this consideration.

Large utility-scale solar plants require vast lands that increase the risk of land degradation and loss of habitat.

The PV cell manufacturing process includes hazardous chemicals such as 1-1-1 Trichloroethene, HCL, H 2 SO 4 , N 2 , NF, and acetone. Workers face risks resulting from inhaling silicon dust. The manufacturing wastes are not disposed of properly. Proper precautions during usage of thin-film PV cells, which contain cadmium—telluride, gallium arsenide, and copper-indium-gallium-diselenide are missing. These materials create severe public health threats and environmental threats.

Hydroelectric power turbine blades kill aquatic ecosystems (fish and other organisms). Moreover, algae and other aquatic weeds are not controlled through manual harvesting or by introducing fish that can eat these plants.

Discussion and recommendations based on the research

Policy and regulation advancements.

The MNRE should provide a comprehensive action plan or policy for the promotion of the renewable sector in its regulatory framework for renewables energy. The action plan can be prepared in consultation with SERCs of the country within a fixed timeframe and execution of the policy/action plan.

The central and state government should include a “Must run status” in their policy and follow it strictly to make use of renewable power.

A national merit order list for renewable electricity generation will reduce power cost for the consumers. Such a merit order list will help in ranking sources of renewable energy in an ascending order of price and will provide power at a lower cost to each distribution company (DISCOM). The MNRE should include that principle in its framework and ensure that SERCs includes it in their regulatory framework as well.

SERCs might be allowed to remove policies and regulatory uncertainty surrounding renewable energy. SERCs might be allowed to identify the thrust areas of their renewable energy development.

There should be strong initiatives from municipality (local level) approvals for renewable energy-based projects.

Higher market penetration is conceivable only if their suitable codes and standards are adopted and implemented. MNRE should guide minimum performance standards, which incorporate reliability, durability, and performance.

A well-established renewable energy certificates (REC) policy might contribute to an efficient funding mechanism for renewable energy projects. It is necessary for the government to look at developing the REC ecosystem.

The regulatory administration around the RPO needs to be upgraded with a more efficient “carrot and stick” mechanism for obligated entities. A regulatory mechanism that both remunerations compliance and penalizes for non-compliance may likely produce better results.

RECs in India should only be traded on exchange. Over-the-counter (OTC) or off-exchange trading will potentially allow greater participation in the market. A REC forward curve will provide further price determination to the market participants.

The policymakers should look at developing and building the REC market.

Most states have defined RPO targets. Still, due to the absence of implemented RPO regulations and the inadequacy of penalties when obligations are not satisfied, several of the state DISCOMs are not complying completely with their RPO targets. It is necessary that all states adhere to the RPO targets set by respective SERCs.

The government should address the issues such as DISCOM financials, must-run status, problems of transmission and evacuation, on-time payments and payment guarantees, and deemed generation benefits.

Proper incentives should be devised to support utilities to obtain power over and above the RPO mandated by the SERC.

The tariff orders/FiTs must be consistent and not restricted for a few years.

Transmission requirements

The developers are worried that transmission facilities are not keeping pace with the power generation. Bays at the nearest substations are occupied, and transmission lines are already carrying their full capacity. This is due to the lack of coordination between MNRE and the Power Grid Corporation of India (PGCIL) and CEA. Solar Corporation of India (SECI) is holding auctions for both wind and solar projects without making sure that enough evacuation facilities are available. There is an urgent need to make evacuation plans.

The solution is to develop numerous substations and transmission lines, but the process will take considerably longer time than the currently under-construction projects take to get finished.

In 2017–2018, transmission lines were installed under the green energy corridor project by the PGCIL, with 1900 circuit km targeted in 2018–2019. The implementation of the green energy corridor project explicitly meant to connect renewable energy plants to the national grid. The budget allocation of INR 6 billion for 2018–2019 should be increased to higher values.

The mismatch between MNRE and PGCIL, which are responsible for inter-state transmission, should be rectified.

State transmission units (STUs) are responsible for the transmission inside the states, and their fund requirements to cover the evacuation and transmission infrastructure for renewable energy should be fulfilled. Moreover, STUs should be penalized if they fail to fulfill their responsibilities.

The coordination and consultation between the developers (the nodal agency responsible for the development of renewable energy) and STUs should be healthy.

Financing the renewable sector

The government should provide enough budget for the clean energy sector. China’s annual budget for renewables is 128 times higher than India’s. In 2017, China spent USD 126.6 billion (INR 9 lakh crore) compared to India’s USD 10.9 billion (INR 75500 crore). In 2018, budget allocations for grid interactive wind and solar have increased but it is not sufficient to meet the renewable target.

The government should concentrate on R&D and provide a surplus fund for R&D. In 2017, the budget allotted was an INR 445 crore, which was reduced to an INR 272.85 crore in 2016. In 2017–2018, the initial allocation was an INR 144 crore that was reduced to an INR 81 crore during the revised estimates. Even the reduced amounts could not be fully used, there is an urgent demand for regular monitoring of R&D and the budget allocation.

The Goods and Service Tax (GST) that was introduced in 2017 worsened the industry performance and has led to an increase in costs and poses a threat to the viability of the ongoing projects, ultimately hampering the target achievement. These GST issues need to be addressed.

Including the renewable sector as a priority sector would increase the availability of credit and lead to a more substantial participation by commercial banks.

Mandating the provident funds and insurance companies to invest the fixed percentage of their portfolio into the renewable energy sector.

Banks should allow an interest rebate on housing loans if the owner is installing renewable applications such as solar lights, solar water heaters, and PV panels in his house. This will encourage people to use renewable energy. Furthermore, income tax rebates also can be given to individuals if they are implementing renewable energy applications.

Improvement in manufacturing/technology

The country should move to domestic manufacturing. It imports 90% of its solar cell and module requirements from Malaysia, China, and Taiwan, so it is essential to build a robust domestic manufacturing basis.

India will provide “safeguard duty” for merely 2 years, and this is not adequate to build a strong manufacturing basis that can compete with the global market. Moreover, safeguard duty would work only if India had a larger existing domestic manufacturing base.

The government should reconsider the safeguard duty. Many foreign companies desiring to set up joint ventures in India provide only a lukewarm response because the given order in its current form presents inadequate safeguards.

There are incremental developments in technology at regular periods, which need capital, and the country should discover a way to handle these factors.

To make use of the vast estimated renewable potential in India, the R&D capability should be upgraded to solve critical problems in the clean energy sector.

A comprehensive policy for manufacturing should be established. This would support capital cost reduction and be marketed on a global scale.

The country should initiate an industry-academia partnership, which might promote innovative R&D and support leading-edge clean power solutions to protect the globe for future generations.

Encourage the transfer of ideas between industry, academia, and policymakers from around the world to develop accelerated adoption of renewable power.

Awareness about renewables

Social recognition of renewable energy is still not very promising in urban India. Awareness is the crucial factor for the uniform and broad use of renewable energy. Information about renewable technology and their environmental benefits should reach society.

The government should regularly organize awareness programs throughout the country, especially in villages and remote locations such as the islands.

The government should open more educational/research organizations, which will help in spreading knowledge of renewable technology in society.

People should regularly be trained with regard to new techniques that would be beneficial for the community.

Sufficient agencies should be available to sell renewable products and serve for technical support during installation and maintenance.

Development of the capabilities of unskilled and semiskilled workers and policy interventions are required related to employment opportunities.

An increase in the number of qualified/trained personnel might immediately support the process of installations of renewables.

Renewable energy employers prefer to train employees they recruit because they understand that education institutes fail to give the needed and appropriate skills. The training institutes should rectify this issue. Severe trained human resources shortages should be eliminated.

Upgrading the ability of the existing workforce and training of new professionals is essential to achieve the renewable goal.

Hybrid utilization of renewables

The country should focus on hybrid power projects for an effective use of transmission infrastructure and land.

India should consider battery storage in hybrid projects, which support optimizing the production and the power at competitive prices as well as a decrease of variability.

Formulate mandatory standards and regulations for hybrid systems, which are lagging in the newly announced policies (wind-solar hybrid policy on 14.05.2018).

The hybridization of two or more renewable systems along with the conventional power source battery storage can increase the performance of renewable technologies.

Issues related to sizing and storage capacity should be considered because they are key to the economic viability of the system.

Fiscal and financial incentives available for hybrid projects should be increased.

The renewable sector suffers notable obstacles. Some of them are inherent in every renewable technology; others are the outcome of a skewed regulative structure and marketplace. The absence of comprehensive policies and regulation frameworks prevent the adoption of renewable technologies. The renewable energy market requires explicit policies and legal procedures to enhance the attention of investors. There is a delay in the authorization of private sector projects because of a lack of clear policies. The country should take measures to attract private investors. Inadequate technology and the absence of infrastructure required to establish renewable technologies should be overcome by R&D. The government should allow more funds to support research and innovation activities in this sector. There are insufficiently competent personnel to train, demonstrate, maintain, and operate renewable energy structures and therefore, the institutions should be proactive in preparing the workforce. Imported equipment is costly compared to that of locally manufactured; therefore, generation of renewable energy becomes expensive and even unaffordable. Hence, to decrease the cost of renewable products, the country should become involve in the manufacturing of renewable products. Another significant infrastructural obstacle to the development of renewable energy technologies is unreliable connectivity to the grid. As a consequence, many investors lose their faith in renewable energy technologies and are not ready to invest in them for fear of failing. India should work on transmission and evacuation plans.

Inadequate servicing and maintenance of facilities and low reliability in technology decreases customer trust in some renewable energy technologies and hence prevent their selection. Adequate skills to repair/service the spare parts/equipment are required to avoid equipment failures that halt the supply of energy. Awareness of renewable energy among communities should be fostered, and a significant focus on their socio-cultural practices should be considered. Governments should support investments in the expansion of renewable energy to speed up the commercialization of such technologies. The Indian government should declare a well-established fiscal assistance plan, such as the provision of credit, deduction on loans, and tariffs. The government should improve regulations making obligations under power purchase agreements (PPAs) statutorily binding to guarantee that all power DISCOMs have PPAs to cover a hundred percent of their RPO obligation. To accomplish a reliable system, it is strongly suggested that renewables must be used in a hybrid configuration of two or more resources along with conventional source and storage devices. Regulatory authorities should formulate the necessary standards and regulations for hybrid systems. Making investments economically possible with effective policies and tax incentives will result in social benefits above and beyond the economic advantages.

Availability of data and materials

Not applicable.

Abbreviations

Accelerated depreciation

Billion units

Central Electricity Authority of India

Central electricity regulatory commission

Central financial assistance

Expression of interest

Foreign direct investment

Feed-in-tariff

Ministry of new and renewable energy

Research and development

Renewable purchase obligations

State electricity regulatory

Small hydropower

Terawatt hours

Waste to energy

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The authors gratefully acknowledge the support provided by the Research Consultancy Institute (RCI) and the department of Electrical and Computer Engineering of Effat University, Saudi Arabia.

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Kumar. J, C.R., Majid, M.A. Renewable energy for sustainable development in India: current status, future prospects, challenges, employment, and investment opportunities. Energ Sustain Soc 10 , 2 (2020). https://doi.org/10.1186/s13705-019-0232-1

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Exploring the optoelectronic and thermoelectric properties of Ge 1− x Bi x Te (at x  = 12% and 24%) using GGA and GGA + SO approximation for renewable energy applications: a DFT study

• Original Paper
• Published: 16 May 2024

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• Naqash H. Malik 1 ,
• Qaiser Rafiq   ORCID: orcid.org/0009-0003-9085-3444 2 ,
• Muhammad Farooq Nasir 1 ,
• Sikander Azam 1 ,
• Muhammad Tahir Khan 3 , 4 ,
• Munirah D. Albaqami 5 &
• Saikh Mohammad 5  

The growing material for optoelectronics, thermoelectric and renewable energy applications includes Ge 1− x Bi x Te ( x  = 12% and 24%). So, by using DFT and WEIN2k code, we calculated the electronic, optical and also thermoelectric properties of Ge 1− x Bi x Te ( x  = 12% and 24%). In GGA and GGA + SO, the band structures are studied which shows metallic nature. The entire geometric optimization process was carried out based on the cell parameters. Obtained results suggested that Ge 1− x Bi x Te ( x  = 12% and 24%) exhibits a predominantly metallic behavior. From through study of electronic charge density, we verified that the nature of examined material is primarily metallic. Bottom of the conduction and top of valence bands are due to Bi, Ge- p and Ti- p / s orbitals with minimal contributions of Bi-s orbitals states. We estimated optical parameters like optical conductivity, absorption coefficient, dielectric function, reflectivity coefficient, loss function, and refractive index for the polarized incident radiation. Finally, we calculated thermoelectric attributes like seebeck coefficient and others with the use of Boltzmann transport theory. The calculated optical and thermoelectric properties suggested that the doped system could be a potential material for optoelectronic applications with high absorption coefficient values in visible and ultraviolet region. This research provides valuable insights into the potential use of Ge 1-x Bi x Te for both x  = 12% and 24% by using GGA + SO as promising candidate for renewable energy applications.

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Acknowledgements

This work was funded by the Researchers Supporting Project Number (RSP2024R267) King Saud University, Riyadh, Saudi Arabia.

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Naqash H. Malik, Muhammad Farooq Nasir & Sikander Azam

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Qaiser Rafiq

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Malik, N.H., Rafiq, Q., Nasir, M.F. et al. Exploring the optoelectronic and thermoelectric properties of Ge 1− x Bi x Te (at x  = 12% and 24%) using GGA and GGA + SO approximation for renewable energy applications: a DFT study. Chem. Pap. (2024). https://doi.org/10.1007/s11696-024-03506-2

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DOI : https://doi.org/10.1007/s11696-024-03506-2

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Flowable Energy Storage

Deepak Dubal (Queensland University of Technology, Australia)

Yun Suk Huh (Inha University, South Korea)

Yongdan Li (Aalto University, Finland)

Peng Tan (University of Science and Technology of China)

This Energy Advances themed collection will report research across a broad scope of topics related to flowable energy storage, including redox flow batteries (including lithium-sulfur, vanadium and aqueous organic systems), electrochemical flow capacitors, and component design for these systems. Studies reporting solutions to cost and safety barriers to grid-scale and commercial use of flowable energy storage technologies are welcomed.

Manuscripts should be submitted via the Royal Society of Chemistry’s online submission service and the Editorial Office informed by email. Please state the code “YAFlowEn23” in the “Comments to the Editor” submission question when you submit your manuscript, to indicate that this is a submission for the themed collection. The Editorial Office reserves the right to check suitability of submissions in relation to the scope of the collection and inclusion of accepted articles in the collection is not guaranteed. All manuscripts will be subject to the journal's usual peer review process. Accepted manuscripts will be added to the online collection as soon as they are online and they will be published in a regular issue of Energy Advances .

Nanomaterials for Solar Energy Conversion

30 September 2024

Robert Pankow (The University of Texas at El Paso)

Rengui Li (Dalian Institute of Chemical Physics, Chinese Academy of Sciences)

Fiona Beck (Australian National University)

Aruna Ivaturi (University of Strathclyde)

In this gold open-access themed collection, we aim to cover the latest developments at the forefront of this field, with a focus on emerging materials and methods.

Topics of interest include, but are not limited to:

• Nanomaterials in photovoltaics – including quantum dot and nanowire-based solar cells, and thin-film solar cells incorporating nanomaterials.
• Nanomaterials for solar fuel production – encompassing photo(electro)catalytic water splitting, CO2 conversion, N2 conversion and the related solar-driven catalysis.
• Nanomaterial based devices – including integrating nanomaterials into solar cells, plasmonic effects in improving the performance of solar cells, and more resource-efficient methods of manufacturing nanomaterials and devices.
• Papers considering the fundamental behaviour of nanomaterials, including charge carrier transport and quantum effects. These studies should consider the relevance of these phenomena in the context of advancing energy science.

By harnessing the potential of nanomaterials, we can develop more cost-effective and sustainable solar cells, photo(electro)catalysts, and solar fuel devices, thus reducing our dependence on fossil fuels and mitigating environmental impacts associated with energy production. Understanding the fundamental principles underlying nanomaterial-based solar energy conversion can pave the way for innovative solutions to global energy challenges.

Energy Advances publishes exciting research across the spectrum of energy science, including energy storage, materials science, policy, technology, digital materials and beyond. Authors are welcome to submit original research as a Communication article or Full Paper or contribute a review article. Please  contact the editorial office to register your interest or for more information. Alternatively, you can submit a manuscript below.

Manuscripts should be submitted via the Royal Society of Chemistry’s online submission service and the Editorial Office informed by email. Please state the code “YANaSoEn24” in the “Comments to the Editor” submission question when you submit your manuscript, to indicate that this is a submission for the themed collection. The Editorial Office reserves the right to check suitability of submissions in relation to the scope of the collection and inclusion of accepted articles in the collection is not guaranteed. All manuscripts will be subject to the journal's usual peer review process. Accepted manuscripts will be added to the online collection as soon as they are online and will be published in a regular issue of Energy Advances.

Exploring the Frontiers: Unveiling New Horizons in Carbon Efficient Biomass Utilization

Open for submissions now

31 October 2024

Guest Editor(s):

Zhi-Hua Liu (Tianjin University), Bing-Zhi Li (Tianjin University), Joshua Yuan (Washington University in St. Louis), James Clark (University of York), Vânia Zuin Zeidler (Leuphana Universitat Luneburg), Lieve Laurens (National Renewable Energy Laboratory), Arthur Ragauskas (The University of Tennessee Knoxville), Joao Coutinho (CICECO-Universidade de Aveiro) and Buxing Han (Institute of Chemistry, Chinese Academy of Sciences)

Lignocellulosic biomass, which is the most plentiful source of renewable energy, serves as a vital storehouse of energy within chemical bonds formed during photosynthetic CO 2 reduction. The utilization of this abundant natural resource has a transformative role in the advancement of sustainable development and human civilization. Biomass conversion employs environmentally friendly techniques to convert renewable bioresources into valuable products such as biofuels, chemicals, and materials. Biomass utilization contributes significantly to the transition towards bio-economy, green chemistry, and carbon neutrality. This themed collection intends to showcase cutting-edge research, advancements, and innovations in carbon efficient biomass utilization, with a particular focus on uncovering new possibilities and opportunities in this field.

This themed collection also aims to showcase innovative biotechnical solutions that can effectively transform biomass for a wide range of applications, while also addressing the current challenges and prospects in the field of carbon efficient biomass utilization. We believe that this themed collection will be of great interest to researchers in various fields such as green chemistry, synthetic biology, artificial intelligence, enzyme engineering, lignin valorization, biorefineries, sustainability, and environmental studies, among others.

Preferred topics include but are not limited to:

• Biomass fractionation technologies : Exploration of emerging deconstruction and fractionation approaches to enhance the accessibility and convertibility of the biomass.
• Enzymatic and microbial conversion : Prospecting novel enzymes and microorganisms for efficient bioconversion of carbohydrates and lignin into value-added biofuels, biochemicals, and biomaterials.
• Synthetic biology approaches : Highlighting the application of synthetic biology principles to design microbial cell factory for improved biomass conversion; designing biosensors to regulate metabolic networks and enhance microbial cell factory performance.
• Biocatalysis and enzyme engineering : Showcasing advancements in biocatalysis and enzyme engineering to enhance their efficiency, specificity, and stability in carbohydrates and lignin conversion.
• Artificial intelligence (AI) technology : Exploiting cutting-edge AI and machine learning techniques for screening, mining, engineering, and de novo design of vital ligninolytic enzymes and other important enzymes in biomass and lignin valorization.
• Design and evaluation of sustainable and carbon efficient biomass utilization : Exploring innovative approaches and routes to enhance the sustainability and carbon efficiency of biomass and lignin valorization; developing a synthesis solution for producing biodegradable and sustainable materials from biomass utilization; promoting a circular carbon economy and striving towards carbon neutrality in biomass utilization.
• Other innovative technical strategies for carbon efficient biomass utilization .

This call for papers is open for the following article types:

• Communications
• Full papers

If you would like to contribute to this themed collection, you can submit your article directly through the journal’s online submission service . Please answer the themed collection question in the submission form when uploading your files to say that this is a contribution to the themed collection and add a “Note to the Editor” that this is from the Open Call. The Editorial Office reserves the right to check the suitability of submissions in relation to the scope of both the journal and the collection, and the inclusion of accepted articles in the final themed issue is not guaranteed.

All submissions undergo our fair and impartial peer-review and accepted articles will be published online in a citeable form, included in the web collection and published in an issue as soon as they are ready.

Green Chemistry  is a Transformative Journal, and Plan S compliant

Impact factor: 9.8*

Time to first decision (all decisions): 13.0 days**

Time to first decision (peer reviewed only): 35.0 days***

Chair: Javier Pérez-Ramírez

Indexed in Web of Science

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Green Chemistry Emerging Investigators Series

Open for nominations now

Green Chemistry is proud to present its Emerging Investigator Series, showcasing the work being conducted by Emerging Investigators. This collection aims to highlight the excellent research being carried out by researchers in the early stages of their independent careers from across the breadth of green chemistry.

The Emerging Investigators Series has an overall objective to showcase the full diversity of cutting-edge research carried out by newer voices from across the worldwide green chemistry community.

This themed collection is an invitation-only initiative, with nominations curated by our Editorial Office. We will however consider additional applications and nominations on their own merit, and we encourage the green chemistry community to send in their nominees. Self-nominations are welcome!

In order to be eligible to feature as an Emerging Investigator, contributors must:

• Publish research within the scope of the journal.
• Have completed their PhD.
• Be actively pursuing an independent research career.
• Be at an early stage of their independent career (typically this will be within 15 years of completing their PhD, but appropriate consideration will be given to those who have taken a career break or followed a different career path).

To best meet the needs of our contributing authors, there will be no fixed deadlines . Accepted articles will be published online in a citeable form, included in the web collection and collated in an online issue as soon as they are ready. We aim to promote all the papers and authors periodically.

By contributing as a corresponding author, the researchers will be internationally recognised as outstanding emerging scientists in the field. This collection provides an excellent opportunity to raise their profile in the community, and a short profile of each researcher will be featured in the journal.

How to nominate

Nominations must be made via email to  [email protected]  including the following information about the nominee:

• Current affiliation
• Current email address
• Researcher/group website (optional)

Liquid-based Materials: Novel Concepts from Fundamentals to Applications

1 November 2023

10 April 2024

Prof. Xu Hou (Xiamen University, China), Prof. Jungmok Seo (Yonsei University, South Korea)

Industrial Chemistry & Materials is pleased to announce a call for papers for Liquid-based Materials, which are structures or functions based on liquid or soft substances. 

This themed collection aims to collect the recent research breakthroughs, reviews, perspectives and comments on liquid-based materials from fundamentals to applications.

Topics: Advanced gel materials; Liquid metals; ionic liquids; Smart/responsive liquids; Liquid-infused surfaces/membranes; Micro/nanofluidic devices; Soft matter; Bioinspired liquid-based materials; Particles at the liquid interface; Functional & adaptive surfaces, etc.

Editor-in-Chief: Suojiang Zhang

Gold open access, APCs waived until 2025

Time to first decision (all decisions): 6 days**

Time to first decision (peer-reviewed only): 23 days***

Indexed in the Chemical Abstracts (CA) and Directory of Open Access Journals (DOAJ).

Read news on our ICM blog

Open access publishing

Frontiers in Electrocatalysis for Clean Energy

06 December 2023

26 April 2024

Huang Yizhong, (NTU, Singapore) Anders Hagfeldt, (Uppsala University, Sweden) Kelsey Stoerzinger, (University of Minnesota, USA) Ahsan Ul Haq Qurashi, (Khalifa University, Abu Dhabi)

In this themed collection, the major focus will be on materials interplay in the electrochemical microenvironment, long term stability of earth abundant electrocatalysts, frontiers in theoretical understanding of nano-interfaces, role of Operando techniques, Benchmarking C 2 products from CO 2 reduction and outperforming electrocatalytic materials for other electrochemical reactions.

• Electrocatalysts in confined atmosphere (materials interplay and micro-environment).
• Long-term stability of earth-abundant electrocatalysts, Single, Dual (Dimers) and Tri (trimers) atom electrocatalysts and their theoretical investigations.
• Anti-corrosive performance of electrocatalysts, Operando investigations of next-generation electrocatalysts, critical role of novel conducting support for electrocatalysts, electrocatalyst structural transformation and influence of micro-environment.
• Long-term electrocatalyst performance in PV integrated reactions.
• Benchmarking electrocatalyst for C 2 products in carbon dioxide conversion.
• Outperforming electrocatalyst for nitrogen & nitrate reduction, hydrogen and hydrogen peroxide production and their overall efficiency.

Submissions to the journal should fit within the scope of  Journal of Materials Chemistry A – Please see the journal’s website for more information on the journal’s scope, standards, article types and author guidelines.

If you would like to contribute to this themed collection, please submit your article directly through the Journal of Materials Chemistry A submission service . Please mention that your submission is a contribution to the ‘Advancing energy-materials through high-throughput experiments and computation ‘collection in the “Themed issues” section of the submission form and add a “Note to the Editor” that this is from the Open Call.

The Editorial Office reserves the right to check the suitability of submissions in relation to the scope of both the journal and the collection, and as such inclusion of accepted articles in the final themed collection is not guaranteed. All submissions will be subject to initial assessment and sent for peer review, if appropriate. We cannot guarantee peer review or acceptance of your submission in the journal.

If you have any questions about the collection or the submission process, please contact the Editorial Office  and they will be able to assist.

Journal of Materials Chemistry A  is a Transformative Journal and Plan S compliant

Impact factor: 11.9*

Time to first decision (all decisions): 10.0 days**

Time to first decision (peer-reviewed only): 30.0 days***

Editor-in-Chief: Anders Hagfeldt

Molecular Photoswitches for Energy storage

26 January 2024

13 June 2024

Prof. Rachel Evans (University of Cambridge)

Prof. Grace Han (Brandeis University)

Prof. Tao Li (Shanghai Jiao Tong University)

Prof. Dr. Hermann A. Wegner (Justus-Liebig Universität)

The necessity to harvest and store energy is one of the greatest challenges of today. The sun represents in this respect the ultimate energy source on earth. The utilization of light as energy input is therefore highly desirable. Molecular photoswitches do exactly that, as they can be switched between two states. Such processes have great potential in energy storage. This special issue celebrates results in all areas covering molecular photoswitches in the broadest sense for energy storage:

Appropriate topics include, but are not limited to:

• Design, synthesis and characterization of photoswitches
• Application of photoswitches for energy storage, such as molecular solar thermal energy storage systems
• Incorporation of photoswitches in devices for energy storage
• Investigation of diverse triggering methods for energy release (e.g. electro-catalysis)    
• Phase transitions and latent heat storage-release induced by the photoswitching processes
• Theoretical screening of photoswitch candidates for improved energy storage

Submissions to the journal should contain chemistry in the context of a material and should fit within the scope of  Journal of Materials Chemistry C or Journal of Materials Chemistry A . Please see the journal’s page for more information on the journal’s scope, standards, article types and author guidelines.

If you would like to contribute to this themed collection, you can submit your article directly to the online submission system for  Journal of Materials Chemistry C or Journal of Materials Chemistry A . Please mention that this submission is a contribution to the  Molecular Photoswitches for Energy storage in the “Themed issues” section of the submission form and add a “Note to the Editor” that this is from the Open Call.

Nanomaterials for a sustainable future: From materials to devices and systems

25 March 2024

2 September 2024

Professor Guohua Jia (Curtin University, Australia), Professor Hongxia Wang (Queensland University of Technology, Australia), Professor Xuyong Yang (Shanghai University, China), Professor Lina Quan (Virginia Tech, USA) and Professor Yun Liu (Australian National University, Australia)

As modern society’s demand for energy continues to grow, the development of nanomaterials for reducing energy consumption and generating and storing energy is becoming increasingly important. With advances in synthesis methods and theoretical simulations of nanomaterials, attention has turned to how nanomaterials can be rationally designed and synthesized, transformed into energy devices, and ultimately, how devices (such as solar cells, batteries, fuel cells, supercapacitors, light-emitting diodes, photodetectors etc.) can be integrated into systems to tackle real global challenges. This  Journal of Materials Chemistry A , Journal of Materials Chemistry C  and  Nanoscale  cross-journal collection will capture the cutting-edge innovations in nanomaterials synthesis, simulation, device fabrication, and system integration that are driving this field forward.

• Multifunctional materials (electrical, magnetic, electrochemical, optical, and mechanical materials, etc.)
• Quantum materials (quantum dots, 2D materials, photonics materials, etc.)
• Energy materials (materials for catalysis, CO2 reduction, batteries, hydrogen and solar energy conversion, etc.)
• Materials chemistry calculations (DFT and molecular dynamic simulation and modelling, machine learning assisted design and materials screening, etc.)
• Materials for environment (materials for environment protection, pollutants and toxic products, treatment, environmental remediation, etc.)
• Advanced characterization methods for materials (in-situ Raman, NMR, XRD; synchrotron radiation, neutron diffraction, atomic force microscopy, transmission electron microscopy, etc.)

Submissions to the collection should fit within the scope of  Journal of Materials Chemistry A ,  Journal of Materials Chemistry C  or  Nanoscale . Please see the individual journal pages for more information on the scope, standards, article types and author guidelines.

If you would like to contribute to this themed collection, you can submit your article directly to the online submission system for  Journal of Materials Chemistry A ,  Journal of Materials Chemistry C  or  Nanoscale . Please quote the code XXSusFut24 in the “Themed issues” section of the submission form and add a “Note to the Editor” that this is from the open call.

All manuscripts will undergo the normal initial assessment and peer review processes, if appropriate, in line with the journal’s high standards, managed by the journal editors. Accepted manuscripts will be added to the online collection as soon as they are published and they will be featured in a regular issue of the relevant journal. Please note that peer review or acceptance are not guaranteed.

MSDE Emerging Investigators Series

1 January 2022

MSDE  is proud to present its Emerging Investigators Series. This collection gathers the very best work from scientists in the early stages of their independent careers. It highlights up-and-coming scientists in the early stages of their independent careers in recognition of their potential to influence future directions in the field of molecular engineering.

Emerging Investigators should be at an early stage of their independent career (this should typically be within 12 years of attaining their doctorate or equivalent degree but appropriate consideration is given to those who have taken a career break, work in systems where their time period to independence may vary or who followed an alternative study path).

Manuscripts should be submitted via the Royal Society of Chemistry’s  online submission service  and the Editorial Office informed by  email . Please add a “note to the editor” in the submission form when you submit your manuscript to say that this is a submission for the themed collection. The Editorial Office reserves the right to check suitability of submissions in relation to the scope of the collection and inclusion of accepted articles in the collection is not guaranteed. All manuscripts will be subject to the journal's usual peer review process. Accepted manuscripts will be added to the online collection as soon as they are online and they will be published in a regular issue of  MSDE .

MSDE is a Transformative Journal and Plan S compliant

Impact factor: 3.6*

Time to first decision (all decisions): 30.0 days**

Time to first decision (peer reviewed only): 38.0 days***

CiteScore: 7.2****

Editor-in-chief: Claire S Adjiman

Indexed in Web of Science and Scopus

Sustainable Laboratories

20 October 2022

Our new  Sustainable Laboratories report  shines a spotlight on some of the complexities associated with the need to make research more environmentally sustainable, and to coincide with the launch of this report RSC Sustainability is welcoming papers, reviews, and perspectives, which address various approaches to reduce the environmental impact of research and make laboratories more sustainable.

Scientists all over the globe are developing innovative technologies that will be key in achieving the UN Sustainable Development Goals. At the same time, some scientific research is contributing to greenhouse gas emissions, plastic waste, and other environmental issues. This presents many challenges as well as opportunities for researchers, who are increasingly aware of the environmental footprint of their work.

You and your research have the power to make the world a better place. If you’re looking into developing new sustainable technologies or finding cleaner chemical solutions, then we want to hear from you. RSC Sustainability is a dedicated forum for your quality discoveries, offering a space for research to grow and make an impact around the globe.

Time to first decision (all decisions): 26.0 days**

Time to first decision (peer-reviewed only): 39.0 days***

Gold open access, APCs waived until mid-2025

Editor-in-chief: Tom Welton

Publication frequency: every month

Indexed in the Directory of Open Access Journals (DOAJ) and Scopus

Open access

Sustainable Composites

29 September 2023

Professor Ian Hamerton (University of Bristol, UK), Dr Lois Hobson (Centre for Process Innovation, UK), Dr Jonathan Wagner (Loughborough University, UK)

This cross-journal themed collection contributes to the action plan from the Sustainable Composite Materials report by the RSC. It aims to create opportunities for researchers to publish peer-reviewed studies on sustainable composites.

Conference special issue: 6th EuChemS Conference on Green and Sustainable Chemistry

1 April 2024

Luigi Vaccaro (Università degli Studi di Perugia, Italia), Arjan W. Kleij (ICIQ, Spain), Ana Aguiar-Ricardo (FCT NOVA, Portugal) and Paolo Melchiorre (ICIQ, Spain & University of Bologna, Italy)

In celebration of the 6th EuChemS Conference on Green and Sustainable Chemistry, a series of journals across the Royal Society of Chemistry are hosting a themed collection to celebrate research in this area. As a global society publisher, the RSC positions itself as a leading voice for the chemical sciences, which puts sustainability in the spotlight. We recognise the potential of the chemical sciences to provide innovative solutions to the most pressing challenges – and the importance of giving a platform to scientists whose discoveries catalyse global change.

This collection will celebrate both the vibrant and collaborative spirit of the conference, and the contribution green & sustainable chemistry makes to solving global challenges.

The journals that are available to receive submissions in response to this open call include Catalysis Science & Technology , Green Chemistry , RSC Advances , Reaction Chemistry & Engineering and RSC Sustainability .

The scope of this collection covers the breadth of green & sustainable chemistry, with emphasis on the following areas:

• Alternative fuels and green energy
• Benign low-energy chemical processes
• Biomass and CO2 utilization
• Green chemistry metrics and environmental assessment
• Pollution prevention and remediation
• Sustainable catalytic, industrial and synthetic processes
• Waste recycling and valorisation and the circular (bio)economy

The submission deadline is 1st April 2024.

Manuscripts should be submitted via the Royal Society of Chemistry’s online submission service and the Editorial Office informed by email. Please state the code “ XX6GCEUC24 ” in the “Comments to the Editor” submission question when you submit your manuscript, to indicate that this is a submission for the themed collection. The Editorial Office reserves the right to check suitability of submissions in relation to the scope of the collection and inclusion of accepted articles in the collection is not guaranteed. All manuscripts will be subject to the journal's usual peer review process. Accepted manuscripts will be added to the online collection as soon as they are online and they will be published in a regular issue of the journal.

Energy Materials Redesign, Reuse and Repurpose

31 July 2024

Cristina Pozo-Gonzalo Instituto de Carboquimica-CSIC) Bethan Charles (University of Bristol, UK) Xiaolei Wang (University of Alberta, Canada) Erlantz Lizundia (Universidad del Pais Vasco, Spain)

A huge amount of research funding and effort is devoted to producing new materials for energy applications that are cheaper, more efficient or have higher capacity than the materials already available on the market. But how sustainable are these materials? RSC Sustainability is accepting papers for a new themed collection centred on how energy materials can be recycled. If you have work that may be suitable, enquire now.

CO 2 Conversion

14 August 2024

Haichao Liu (Peking University, China) Carlos Alemán (Universitat Politècnica de Catalunya, Spain) John Mondal (CSIR-Indian Institute of Chemical Technology, India) Xiao Jiang (Aramco Research Center, USA)

As the world moves away from fossil fuels, it will be imperative that there are alternative sources of carbon to allow for continued manufacturing of the products that society has come to rely on. Utilising CO 2 has the added benefit of reducing the impact of its effects as a greenhouse gas. RSC Sustainability is seeking submissions describing work on converting carbon dioxide to more useful compounds for a new themed collection on CO 2 conversion. Enquire now for more information.

The RSC Sustainability CO 2 Conversion-themed collection seeks to publish work on the following topics:

• Catalytic conversion of CO 2 , to value-added chemicals or fuels.
• Electrochemical conversion of CO 2
• Photochemical conversion of CO 2
• Biological conversion of CO 2 using algae or bacteria

We welcome submissions that report new or improved methodologies, or that optimise or improve the sustainability of an existing process. We also welcome submissions from industrial and policy, as well as academic, perspectives.

If you would like to submit to this collection, write the themed collection shortcode SUCO224 in the comments to the editor section of your submission.

Circular Economy

28 August 2024

Vincent Nyamori (University of KwaZulu-Natal, South Africa) Alice Fan (University of York, UK) Matthew Davies (Swansea University, UK) Manie Vosloo (North-West University, South Africa)

The principle of the Circular Economy will be pivotal to achieving a sustainable future, and chemistry will be integral in making it a reality. RSC Sustainability is proud to announce a new themed collection devoted to efforts to minimising waste, ensuring materials are recycled and that any waste that is generated is converted into a more valuable resource. If you have work that fits with this, enquire now about the RSC Sustainability Circular Economy-themed collection.

Sustainable Energy & Fuels Emerging Investigators Series

1 July 2022

N/A (these ongoing series do not have Guest Editors)

Sustainable Energy & Fuels  is delighted to announce our Emerging Investigators Series, highlighting the very best work from researchers in the early stages of their independent careers. The collection showcases research from early career energy scientists who are working towards making future energy technologies more sustainable, in line with UN Sustainable Development Goal 7 and the scope of Sustainable Energy & Fuels.

Emerging Investigators should be at an early stage of their independent career (this should typically be within 10 years of attaining their doctorate or equivalent degree but appropriate consideration is given to those who have taken a career break, work in systems where their time period to independence may vary or who followed an alternative study path).

Manuscripts should be submitted via the Royal Society of Chemistry’s  online submission service  and the Editorial Office informed by  email . Please add a “note to the editor” in the submission form when you submit your manuscript to say that this is a submission for the themed collection. The Editorial Office reserves the right to check the suitability of submissions in relation to the scope of the collection and inclusion of accepted articles in the collection is not guaranteed. All manuscripts will be subject to the journal's usual peer review process. Accepted manuscripts will be added to the online collection as soon as they are online and they will be published in a regular issue of  Sustainable Energy & Fuels .

Sustainable Energy & Fuels  is a Transformative Journal, and Plan S compliant

Impact factor: 5.6*

Time to first decision (all decisions): 9.0 days**

Time to first decision (peer reviewed only): 31.0 days***

Editor-in-Chief: Garry Rumbles

CiteScore: 9.5****

Green strategies for valorising underexplored biomasses to obtain novel food ingredients, additives, and products

2 October 2024

Elena Ibañez (CIAL-CSIC, Spain; ORCID 0000-0002-0275-6958 ), Lidia Montero (CIAL-CSIC, Spain; ORCID 0000-0001-5722-138X ), Jose Mendiola (CIAL-CSIC, Spain; ORCID 0000-0001-6709-349X )

Aiming to fulfil the Sustainable Development Goals towards the 2030 agenda, new strategies are needed to ensure the sustainable production of products and ingredients. One of these strategies is the use of underexplored biomasses from different origins (animal, plant, microbial, marine, terrestrial, agricultural by-products, etc.), which could provide new food ingredients, additives or products that meet sustainability criteria and allow the development of circular bioeconomy strategies within the food industry. Valorisation of underexplored biomass and underutilized resources can open the door to novel products with new applications and improved characteristics, while new technological and greener processes, meeting the criteria of low environmental impact and high productivity, can improve the sustainability of the food industry. Therefore, the present collection aims at gathering original manuscripts, review articles and opinion articles within its scope, which includes, but is not limited to, the following topics:

• New underexplored biomasses and underutilised resources to obtain novel food ingredients
• New underexplored biomasses and underutilised resources to obtain new additives and products with improved characteristics
• New green processes to extract compounds/ingredients from underused biomasses
• New green manufacturing processes to develop new products for the food industry
• New green biorefinery processes for underexplored biomasses and underutilized resources
• Life Cycle Assessment or other metric tools to evaluate the greenness of a process or product

Authors are welcome to submit original review articles. The manuscript should be prepared according to our article guidelines and submitted via our online system.

All manuscripts will be subject to the usual initial assessment and peer review processes as necessary, and inclusion in the Collection will be at the discretion of the Guest Editors. Please indicate in your submission that you are submitting to this Collection and inform the Editorial Office by email .

Following our peer-review process, we will publish accepted articles online in a citeable form as soon as they are ready, with compilation and promotion of the complete collection in late 2024.

Sustainable Food Technology is a gold open access journal focused on cutting-edge strategies for food production that aim to provide quality and safe foods in an environmentally conscious and sustainable way. We are covering all article processing charges (APCs) until mid-2025, so it is currently free to publish in this journal.

What would you like to know about Sustainable Food Technology ?

Time to first decision (all decisions): 33.0 days**

Time to first decision (peer-reviewed only): 49.0 days***

Editor-in-Chief: Jorge Barros Velázquez

*2022 Journal Citation Reports (Clarivate Analytics, 2023)

**The median time from submission to first decision including manuscripts rejected without peer review from the previous calendar year

***The median time from submission to first decision for peer-reviewed manuscripts from the previous calendar year

****CiteScore™ 2022 available at   www.scopus.com/sources

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Renewable Energy

Renewable energy comes from sources that will not be used up in our lifetimes, such as the sun and wind.

Earth Science, Experiential Learning, Engineering, Geology

Wind Turbines in a Sheep Pasture

Wind turbines use the power of wind to generate energy. This is just one source of renewable energy.

Photograph by Jesus Keller/ Shutterstock

The wind, the sun, and Earth are sources of  renewable energy . These energy sources naturally renew, or replenish themselves.

Wind, sunlight, and the planet have energy that transforms in ways we can see and feel. We can see and feel evidence of the transfer of energy from the sun to Earth in the sunlight shining on the ground and the warmth we feel when sunlight shines on our skin. We can see and feel evidence of the transfer of energy in wind’s ability to pull kites higher into the sky and shake the leaves on trees. We can see and feel evidence of the transfer of energy in the geothermal energy of steam vents and geysers .

People have created different ways to capture the energy from these renewable sources.

Solar Energy

Solar energy can be captured “actively” or “passively.”

Active solar energy uses special technology to capture the sun’s rays. The two main types of equipment are photovoltaic cells (also called PV cells or solar cells) and mirrors that focus sunlight in a specific spot. These active solar technologies use sunlight to generate electricity , which we use to power lights, heating systems, computers, and televisions.

Passive solar energy does not use any equipment. Instead, it gets energy from the way sunlight naturally changes throughout the day. For example, people can build houses so their windows face the path of the sun. This means the house will get more heat from the sun. It will take less energy from other sources to heat the house.

Other examples of passive solar technology are green roofs , cool roofs, and radiant barriers . Green roofs are completely covered with plants. Plants can get rid of pollutants in rainwater and air. They help make the local environment cleaner.

Cool roofs are painted white to better reflect sunlight. Radiant barriers are made of a reflective covering, such as aluminum. They both reflect the sun’s heat instead of absorbing it. All these types of roofs help lower the amount of energy needed to cool the building.

Advantages and Disadvantages There are many advantages to using solar energy. PV cells last for a long time, about 20 years.

However, there are reasons why solar power cannot be used as the only power source in a community. It can be expensive to install PV cells or build a building using passive solar technology.

Sunshine can also be hard to predict. It can be blocked by clouds, and the sun doesn’t shine at night. Different parts of Earth receive different amounts of sunlight based on location, the time of year, and the time of day.

Wind Energy

People have been harnessing the wind’s energy for a long, long time. Five-thousand years ago, ancient Egyptians made boats powered by the wind. In 200 B.C.E., people used windmills to grind grain in the Middle East and pump water in China.

Today, we capture the wind’s energy with wind turbines . A turbine is similar to a windmill; it has a very tall tower with two or three propeller-like blades at the top. These blades are turned by the wind. The blades turn a generator (located inside the tower), which creates electricity.

Groups of wind turbines are known as wind farms . Wind farms can be found near farmland, in narrow mountain passes, and even in the ocean, where there are steadier and stronger winds. Wind turbines anchored in the ocean are called “ offshore wind farms.”

Wind farms create electricity for nearby homes, schools, and other buildings.

Advantages and Disadvantages Wind energy can be very efficient . In places like the Midwest in the United States and along coasts, steady winds can provide cheap, reliable electricity.

Another great advantage of wind power is that it is a “clean” form of energy. Wind turbines do not burn fuel or emit any pollutants into the air.

Wind is not always a steady source of energy, however. Wind speed changes constantly, depending on the time of day, weather , and geographic location. Currently, it cannot be used to provide electricity for all our power needs.

Wind turbines can also be dangerous for bats and birds. These animals cannot always judge how fast the blades are moving and crash into them.

Geothermal Energy

Deep beneath the surface is Earth’s core . The center of Earth is extremely hot—thought to be over 6,000 °C (about 10,800 °F). The heat is constantly moving toward the surface.

We can see some of Earth’s heat when it bubbles to the surface. Geothermal energy can melt underground rocks into magma and cause the magma to bubble to the surface as lava . Geothermal energy can also heat underground sources of water and force it to spew out from the surface. This stream of water is called a geyser.

However, most of Earth’s heat stays underground and makes its way out very, very slowly.

We can access underground geothermal heat in different ways. One way of using geothermal energy is with “geothermal heat pumps.” A pipe of water loops between a building and holes dug deep underground. The water is warmed by the geothermal energy underground and brings the warmth aboveground to the building. Geothermal heat pumps can be used to heat houses, sidewalks, and even parking lots.

Another way to use geothermal energy is with steam. In some areas of the world, there is underground steam that naturally rises to the surface. The steam can be piped straight to a power plant. However, in other parts of the world, the ground is dry. Water must be injected underground to create steam. When the steam comes to the surface, it is used to turn a generator and create electricity.

In Iceland, there are large reservoirs of underground water. Almost 90 percent of people in Iceland use geothermal as an energy source to heat their homes and businesses.

Advantages and Disadvantages An advantage of geothermal energy is that it is clean. It does not require any fuel or emit any harmful pollutants into the air.

Geothermal energy is only avaiable in certain parts of the world. Another disadvantage of using geothermal energy is that in areas of the world where there is only dry heat underground, large quantities of freshwater are used to make steam. There may not be a lot of freshwater. People need water for drinking, cooking, and bathing.

Biomass Energy

Biomass is any material that comes from plants or microorganisms that were recently living. Plants create energy from the sun through photosynthesis . This energy is stored in the plants even after they die.

Trees, branches, scraps of bark, and recycled paper are common sources of biomass energy. Manure, garbage, and crops , such as corn, soy, and sugar cane, can also be used as biomass feedstocks .

We get energy from biomass by burning it. Wood chips, manure, and garbage are dried out and compressed into squares called “briquettes.” These briquettes are so dry that they do not absorb water. They can be stored and burned to create heat or generate electricity.

Biomass can also be converted into biofuel . Biofuels are mixed with regular gasoline and can be used to power cars and trucks. Biofuels release less harmful pollutants than pure gasoline.

Advantages and Disadvantages A major advantage of biomass is that it can be stored and then used when it is needed.

Growing crops for biofuels, however, requires large amounts of land and pesticides . Land could be used for food instead of biofuels. Some pesticides could pollute the air and water.

Biomass energy can also be a nonrenewable energy source. Biomass energy relies on biomass feedstocks—plants that are processed and burned to create electricity. Biomass feedstocks can include crops, such as corn or soy, as well as wood. If people do not replant biomass feedstocks as fast as they use them, biomass energy becomes a non-renewable energy source.

Hydroelectric Energy

Hydroelectric energy is made by flowing water. Most hydroelectric power plants are located on large dams , which control the flow of a river.

Dams block the river and create an artificial lake, or reservoir. A controlled amount of water is forced through tunnels in the dam. As water flows through the tunnels, it turns huge turbines and generates electricity.

Advantages and Disadvantages Hydroelectric energy is fairly inexpensive to harness. Dams do not need to be complex, and the resources to build them are not difficult to obtain. Rivers flow all over the world, so the energy source is available to millions of people.

Hydroelectric energy is also fairly reliable. Engineers control the flow of water through the dam, so the flow does not depend on the weather (the way solar and wind energies do).

However, hydroelectric power plants are damaging to the environment. When a river is dammed, it creates a large lake behind the dam. This lake (sometimes called a reservoir) drowns the original river habitat deep underwater. Sometimes, people build dams that can drown entire towns underwater. The people who live in the town or village must move to a new area.

Hydroelectric power plants don’t work for a very long time: Some can only supply power for 20 or 30 years. Silt , or dirt from a riverbed, builds up behind the dam and slows the flow of water.

Other Renewable Energy Sources

Scientists and engineers are constantly working to harness other renewable energy sources. Three of the most promising are tidal energy , wave energy , and algal (or algae) fuel.

Tidal energy harnesses the power of ocean tides to generate electricity. Some tidal energy projects use the moving tides to turn the blades of a turbine. Other projects use small dams to continually fill reservoirs at high tide and slowly release the water (and turn turbines) at low tide.

Wave energy harnesses waves from the ocean, lakes, or rivers. Some wave energy projects use the same equipment that tidal energy projects do—dams and standing turbines. Other wave energy projects float directly on waves. The water’s constant movement over and through these floating pieces of equipment turns turbines and creates electricity.

Algal fuel is a type of biomass energy that uses the unique chemicals in seaweed to create a clean and renewable biofuel. Algal fuel does not need the acres of cropland that other biofuel feedstocks do.

Renewable Nations

These nations (or groups of nations) produce the most energy using renewable resources. Many of them are also the leading producers of nonrenewable energy: China, European Union, United States, Brazil, and Canada

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Completing the picture: How the circular economy tackles climate change

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Completing the Picture: How the Circular Economy Tackles Climate Change reveals the need for a fundamental shift in the global approach to cutting emissions.

Released in collaboration with Material Economics, the paper sets out that while moving to renewables can address 55% of global GHG emissions, to achieve UN climate goals it is imperative to tackle the remaining 45%.

Concentrating on five key areas (cement, plastics, steel, aluminium, and food)  Completing the Picture: How the Circular Economy Tackles Climate Change  illustrates how designing out waste, keeping materials in use, and regenerating farmland can reduce these emissions by 9.3 billion tonnes. That is equivalent to eliminating current emissions from all forms of transport globally.

The paper demonstrates how businesses, financial institutions, and policymakers can build a thriving and resilient economy while playing an essential role in reaching climate targets.

The full paper including executive summary is available in English ,  Español ,  Português ,  中文  

To quote this study, please use the following reference: Ellen MacArthur Foundation, Completing the picture: How the circular economy tackles climate change (2019).

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Climate and the circular economy

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Completing the Picture: Designing a food system that’s positive for nature and our climate

Cop27: key takeaways.

Tackling the climate crisis needs more than clean energy: we need circular economy solutions

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This topic area examines how the circular economy can help shape a nature-positive future.

News and updates from The Ellen MacArthur Foundation

The Ellen MacArthur Foundation works to accelerate the transition to a circular economy. We develop and promote the idea of a circular economy, and work with business, academia, policymakers, and institutions to mobilise systems solutions at scale, globally.

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