2020 · Paper V · 10 marksFrequently asked

What is "Clean Energy"? List the sources of clean energy and explain how they work. Which of these sources can be used or are already widely used in India?

In short

Clean energy is energy produced with little or no greenhouse gas or pollution, from solar (PV cells), wind (turbines), hydro, biomass, geothermal and hydrogen fuel cells. Solar, wind, hydro and biomass are already widely used in India, while geothermal and fuel cells remain emerging.

Model answer

Ghissu Editorial · Verified 4 Oct 2026

Introduction
India’s clean energy transition1 addresses climate change and rising energy demand, aiming for 50% non-fossil capacity by 2030 (reached in 2025) and net-zero emissions by 2070. This shift is vital for sustainable development and energy security.
Institutional Framework and State Initiatives
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Policy and Incentives

The National Solar Mission targets 500 GW renewable capacity by 2030; schemes like Perform, Achieve and Trade (PAT) and Carbon Credit Trading Scheme32 (CCTS) promote energy efficiency and carbon reduction. Fiscal incentives such as Generation Based Incentives encourage private investment.

Clean Energy Sources and Mechanisms
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Solar and Wind Energy

Solar power uses photovoltaic cells to convert sunlight into electricity; capacity surged to 140 GW by 2026 due to declining costs and government support. Wind turbines convert air currents to electricity, with 54.65 GW installed, including Rayalaseema and coastal Andhra Pradesh, harnessing both coastal and inland wind resources.

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Hydropower and Biomass

Hydropower plants on Krishna and Godavari rivers generate significant renewable energy4 by channeling flowing water through turbines. Biomass energy, derived from agricultural residues and wood, still meets much of rural cooking and heating needs, with an estimated availability of 750 million metric tonnes annually.

Challenges and Outcomes
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Rural Energy Access

The PM Surya Ghar mission has brought rooftop solar to over a million homes, enhancing affordability and reducing fossil fuel dependence, improving energy equity.

Way Forward
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Technology and Grid Modernization

Boost R&D in emerging technologies like green hydrogen and advanced energy storage to reduce import dependence. Expand smart grids and storage infrastructure, especially in Andhra Pradesh, to manage renewable variability and improve grid stability.

Conclusion
India’s clean energy progress, backed by robust policies and state efforts, is key to sustainable growth and meeting climate commitments5.

This model answer is indicative and the model can make mistakes; please verify key facts independently.

Hand-drawn diagram: Clean energy sources and how they work. Clean energy sources and how they work. Diagram (tree): Clean energy sources and how they work; Clean energy; Solar: sunlight to electricity; Wind: air currents turn turbines; Hydro: flowing water drives turbines; Biomass: residues release stored energy; Fuel cells: hydrogen plus oxygen
Diagram: Clean energy sources and how they work

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This chapter in the exam

Energy: needs, resources, policy; Nuclear programme and policy24 questions

Asked in 8 of 8 sittings since 2008

2008
2
2011
2
2012
5
2016
4
2017
3
2020
3
2023
4
2025
1

Most tested: Renewable energy transition in India, especially solar/clean energy and barriers to large-scale adoption.

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Question from the official APPSC Group-I Mains 2020 paper. Answer written by Ghissu's engine and checked against our editorial standards. Found an error? Tell us and we correct it within 48 hours.

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