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 · 285 words
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.
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.
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.
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.
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.
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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
Most tested: Renewable energy transition in India, especially solar/clean energy and barriers to large-scale adoption.
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All 24 questions, sorted by sub-topic, with model answers and practice.
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.