Renewable Energy and Climate Mitigation Tech

Beyond wetlands, wildlife and climate finance sits a fourth, technology-heavy corner of the Environment syllabus: the actual hardware of cutting emissions. Green hydrogen, rooftop solar, ethanol blending, carbon capture, even geoengineering, all answer the same question UPSC keeps asking in different forms: what is India actually building, and by when? This note works through each mitigation technology with the real scheme names and numbers examiners test, then ties them together under India's Panchamrit commitments.

Green hydrogen: the new industrial fuel

The Union Cabinet approved the National Green Hydrogen Mission on 4 January 2023 with an outlay of ₹19,744 crore. Its headline target: 5 Million Metric Tonnes (MMT) of green hydrogen production capacity per annum by 2030, alongside roughly 125 GW of added renewable capacity to power the electrolysers that make it. Green hydrogen is hydrogen produced by splitting water using renewable electricity, distinct from grey hydrogen (made from natural gas) and blue hydrogen (grey hydrogen with the resulting carbon captured). The Mission's main delivery mechanism is the Strategic Interventions for Green Hydrogen Transition (SIGHT) programme, which incentivises electrolyser manufacturing and green hydrogen production alongside pilot projects in steel, mobility and shipping. The government projects this will unlock over ₹8 lakh crore in investment, create 6 lakh jobs, and avert nearly 50 MMT of CO2 a year by 2030.

Solar power and biofuels: scaling the supply side

PM Surya Ghar: Muft Bijli Yojana is the residential solar push, aiming to put rooftop panels on 1 crore households by March 2027, adding about 30 GW of capacity and giving eligible households up to 300 units of free electricity a month through a capital subsidy (up to 60% of cost for a 2 kW system, capped at 3 kW). Biofuels moved just as fast: the National Policy on Biofuels, 2018, amended in 2022, advanced the target for 20% ethanol blending in petrol (E20) from 2030 to Ethanol Supply Year (ESY) 2025-26, reached roughly five years early, building on 10% blending achieved in June 2022, five months ahead of its own schedule. Feedstock has diversified well beyond sugarcane molasses to include surplus food grains, maize, and residues such as rice straw and bagasse, a hedge against betting on one crop.

Solar power at scale: the National Solar Mission and India's solar parks

The Jawaharlal Nehru National Solar Mission (JNNSM), launched by the Ministry of New and Renewable Energy on 11 January 2010 as one of the eight missions under the NAPCC, set out to establish India as a global leader in solar energy. Its original target was 20,000 MW of grid-connected solar capacity by 2022, delivered across three phases running from the tail of the 11th Five Year Plan through the 13th. The Union Cabinet raised that target fivefold in 2015, to 1,00,000 MW (100 GW) by 2022, split roughly into 40 GW of rooftop solar and 60 GW of large and medium-scale grid-connected projects, a two-step target history worth holding as two separate numbers rather than one.

To get large-scale solar built without every developer separately chasing land, water and transmission access, MNRE's Scheme for Development of Solar Parks and Ultra Mega Solar Power Projects, rolled out on 12 December 2014, funds shared infrastructure, land, roads, water, evacuation lines, at dedicated sites so developers can set up generation capacity directly rather than assembling scattered small projects. Its own target grew the same way JNNSM's did: an initial 20,000 MW across at least 25 parks, enhanced to 40,000 MW on 21 March 2017, with over 38,000 MW already sanctioned across a dozen states and the scheme's implementation window extended into 2025-26. Rajasthan's Bhadla Solar Park and Karnataka's Pavagada Solar Park are its best known outputs.

The combined effect shows up in the capacity numbers. India's installed solar capacity grew from just 2.82 GW in March 2014 to over 150 GW (150.26 GW) by March 2026, more than fiftyfold in a decade, and the Ministry of New and Renewable Energy now places India third globally in total renewable energy installed capacity, behind only China and the United States and ahead of Brazil, per IRENA's Renewable Energy Statistics 2026. India crossed the 50% non-fossil share of installed electricity capacity milestone in June 2025, MNRE reports, five years ahead of the 2030 timeline that figure carries under the Panchamrit and India's NDC.

The International Solar Alliance: India's solar diplomacy

The International Solar Alliance (ISA), conceived jointly by India and France, was launched at the UN Climate Change Conference (COP21) in Paris on 30 November 2015. Its headquarters sits at the National Institute of Solar Energy campus in Gwal Pahari, Gurugram, Haryana, land and buildings given by India rent free for 25 years. ISA's own Framework Agreement, opened for signature at Marrakech on 15 November 2016, entered into force on 6 December 2017 once 15 countries had ratified it, making ISA the first intergovernmental organisation to be headquartered in India.

Membership is where this cluster is most often tested, because it genuinely changed shape. The original Framework Agreement limited full ISA membership to countries lying wholly or partly between the Tropics of Cancer and Capricorn, the sunshine belt with the greatest solar resource. ISA's first General Assembly amended this on 3 October 2018 to open membership to every United Nations member state; the amendment entered into force on 15 July 2020. A statement describing ISA membership as limited to tropical countries is therefore describing the alliance's pre-2018 design, not its current one: ISA counts over 120 member countries today, per its own account, well beyond the tropics. Its mandate is to mobilise finance, policy support and capacity building for solar deployment across member countries, and its own flagship platform, the Green Grids Initiative, One Sun One World One Grid (jointly launched by India and the United Kingdom at COP26 in Glasgow, November 2021), proposes an interconnected global grid to move solar power from where the sun is shining to wherever demand needs it, across time zones and continents.

Wind energy: onshore scale, offshore ambition

Wind is India's second-largest renewable source by installed capacity, and it remains almost entirely onshore even today. Cumulative wind capacity has crossed 56 GW (56.09 GW as of 31 March 2026, MNRE), up from 21.04 GW in March 2014, placing India fourth in the world in installed wind turbine capacity, concentrated in the wind corridors of Tamil Nadu, Gujarat, Karnataka, Maharashtra, Rajasthan and Andhra Pradesh.

Offshore wind is the genuinely testable policy gap in this space. The Union Cabinet approved the National Offshore Wind Energy Policy on 9 September 2015, naming MNRE the nodal ministry for offshore areas within India's Exclusive Economic Zone, up to 200 nautical miles from the baseline, and the National Institute of Wind Energy (NIWE) the nodal agency for allocating offshore wind blocks. Nearly a decade later, with no offshore project actually commissioned, the Cabinet approved a Viability Gap Funding (VGF) scheme on 19 June 2024 at a total outlay of ₹7,453 crore: ₹6,853 crore to install and commission the country's first 1 GW of offshore wind capacity, 500 MW each off Gujarat and Tamil Nadu, plus ₹600 crore to upgrade two ports for the heavy logistics offshore turbines require. The scheme is meant to seed an ecosystem for an eventual 37 GW of offshore wind by 2029-30, at an estimated investment of roughly ₹4.5 lakh crore. A question testing whether India has achieved offshore wind capacity, rather than merely policy and funding for it, is testing exactly this gap: a 2015 policy followed by 2024 viability funding, with commissioning still ahead.

Carbon capture, utilisation and storage

Carbon Capture, Utilisation and Storage (CCUS) targets emissions that renewable energy cannot reach: cement, steel and other hard-to-abate industrial sectors, where the chemistry itself releases CO2, not just the fuel burned. NITI Aayog released its CCUS Policy Framework report in November 2022, framing CCUS as essential to India's updated NDC targets (50% non-fossil capacity and 45% lower emissions intensity by 2030, net zero by 2070) precisely because continuing coal dependence makes some emissions unavoidable without it. The report sets an ambition of 750 MTPA of CO2 captured, utilised or stored by 2050, projecting 8 to 10 million jobs, and lists real end uses: green urea, building materials, methanol, ethanol, and enhanced oil recovery. Capture and store locks CO2 away permanently underground; capture and utilise turns it into a product; direct air capture, a different idea again, pulls CO2 from ambient air rather than a factory flue.

Geoengineering: the last-resort category

Geoengineering means deliberate, planet-scale intervention to counter climate change, and UPSC tests it mainly as a classification question. It splits into two families: Solar Radiation Management (SRM), which reflects incoming sunlight back to space (stratospheric aerosol injection, marine cloud brightening), and Carbon Dioxide Removal (CDR), which pulls CO2 already in the atmosphere back out (afforestation, direct air capture, ocean fertilisation). The two solve different problems: SRM cools the planet without touching CO2 concentrations, so it does nothing for ocean acidification and risks disrupting monsoon patterns at scale; CDR reduces atmospheric CO2 but works far more slowly. No geoengineering technique is deployed at climate-relevant scale anywhere today, including in India, it remains a research and governance question, which is why exam statements tend to name one specific technique rather than "engineering the climate" in general.

Ozone-depleting substances and the HFC pivot

A genuine two-step story UPSC likes to compress into one trick question. Step one: the Montreal Protocol (1987) phased out CFCs and HCFCs, the refrigerants destroying the ozone layer. Step two: their replacement, hydrofluorocarbons (HFCs), do not deplete ozone at all, but are extremely potent greenhouse gases, some many thousand times more warming than CO2, molecule for molecule. The Kigali Amendment (2016) closed this loophole by bringing HFCs under a phase-down schedule despite them not being ozone-depleting substances. India, classified as an Article 5 Group 2 country for its high ambient temperatures and cooling demand, agreed to freeze HFC consumption and production at its 2024-26 baseline from 1 January 2028, then cut it 10% by 2032, rising to an 85% cut by 2047. A question describing HFCs as "ozone-depleting" is testing exactly this distinction, and it is false: HFCs are a climate problem, not an ozone problem.

Panchamrit and India's net-zero roadmap

India's mitigation targets across all these technologies eventually route back to one framework: the Panchamrit ("five nectar elements"), announced by the Prime Minister at COP26 in Glasgow on 1 November 2021. The five: raising non-fossil energy capacity to 500 GW by 2030; meeting 50% of energy requirements from renewable energy by 2030; cutting total projected carbon emissions by one billion tonnes between then and 2030; reducing the emissions intensity of GDP by 45% (over 2005 levels) by 2030; and achieving net-zero emissions by 2070. India's updated NDC, submitted after COP26, formally carries the 2030 non-fossil-capacity and emissions-intensity numbers. Every technology above, hydrogen, solar, biofuels, CCUS, delivers one or more of these five numbers, not a stand-alone commitment.

Exam angle

Statement questions on this cluster usually swap a number between two similar-sounding targets: non-fossil energy capacity (500 GW) is not the renewable share of energy consumption (50%); ethanol blending's original 2030 deadline moved to 2025-26, so a question citing the old date is testing whether you noticed; CCUS and CDR both remove carbon but at opposite ends of the supply chain (industrial flue gas versus ambient air); and HFCs are routinely mislabelled as ozone-depleting when they are precisely the gas class Kigali regulates because they are not. Anchor each technology to its one governing number and document, and most traps collapse.

Solar and wind carry their own version of the same trick. The National Solar Mission's target moved once, from 20,000 MW to 1,00,000 MW in 2015, so a question anchored to the old 20 GW figure is testing whether the revision registered; the Solar Park Scheme's own capacity moved separately, from 20,000 MW to 40,000 MW in 2017, and conflating the mission target with the park scheme target is a distinct error from conflating old and new numbers within either one. The International Solar Alliance is the sharpest trap of all: it genuinely was restricted to countries between the Tropics of Cancer and Capricorn at launch, so an older-style question testing that restriction is not wrong for its own year, but a current-facts question describing ISA membership as tropics-only today is wrong, since the 2018 amendment opened it to every UN member state. On wind, the trap is timeline, not geography: India approved a National Offshore Wind Energy Policy in 2015 and only reached Cabinet-approved viability funding for its first 1 GW in 2024, with zero megawatts actually commissioned through both dates, so any statement implying India already operates offshore wind capacity is out of date regardless of which year's policy document it quotes.

Quick revision points

• National Green Hydrogen Mission (Jan 2023): 5 MMT/year by 2030, ₹19,744 crore outlay, delivered via the SIGHT programme.
• PM Surya Ghar: 1 crore households, about 30 GW of rooftop solar, by March 2027.
• Ethanol blending: E20 target advanced from 2030 to ESY 2025-26 under the National Policy on Biofuels, 2018 (amended 2022), reached ahead of schedule.
• National Solar Mission (JNNSM): launched 11 January 2010; original target 20,000 MW by 2022, raised to 1,00,000 MW by 2022 in 2015 (40 GW rooftop, 60 GW grid-connected).
• Solar Park Scheme: rolled out 12 December 2014, target enhanced from 20,000 MW to 40,000 MW on 21 March 2017; Bhadla (Rajasthan) and Pavagada (Karnataka) are its flagship parks.
• India's solar and renewable position: installed solar capacity over 150 GW by March 2026 (from 2.82 GW in 2014); India ranks third globally in total renewable energy installed capacity (IRENA, 2026), behind China and the US.
• International Solar Alliance: launched COP21 Paris, 30 November 2015, by India and France; HQ at NISE campus, Gurugram; Framework Agreement in force from 6 December 2017; originally limited to Tropic of Cancer-Capricorn countries, opened to all UN member states by a 2018 amendment (in force 15 July 2020), 120+ members today.
• Wind energy: over 56 GW installed capacity (March 2026), almost entirely onshore, India ranks fourth globally. National Offshore Wind Energy Policy approved 9 September 2015; Cabinet approved a ₹7,453 crore Viability Gap Funding scheme for India's first 1 GW of offshore wind (19 June 2024, Gujarat and Tamil Nadu), with no offshore capacity commissioned yet.
• CCUS: NITI Aayog framework (Nov 2022), 750 MTPA capture, utilisation or storage target by 2050.
• Geoengineering: SRM (reflects sunlight) versus CDR (removes CO2), neither deployed at climate-relevant scale anywhere.
• Kigali Amendment: brings HFCs (not ozone-depleting, but high-warming) under the Montreal Protocol; India freezes HFCs from 2028 (2024-26 baseline), cutting 85% by 2047.
• Panchamrit (COP26, 2021): 500 GW non-fossil capacity, 50% renewable energy share, 1 billion tonne emissions cut, 45% emissions-intensity cut (all by 2030), net zero by 2070.

Try a few questions now to see how these targets get tested against each other.