Subject: Renewable Energy Sector

Why in the News

India’s data centre capacity is set to grow from about 1.5 gigawatts (GW) today to 6.5 GW by 2030, a fourfold expansion in four years, on investment the government estimates at nearly $200 billion over the coming decade. Google, Meta, Amazon and Microsoft have committed billions to build facilities, and States are competing for them with tax exemptions, cheap land and duty waivers. No policy document at the Central or State level has assessed what guaranteed power costs a grid already strained under 45 degree Celsius heat, where cooling water will come from, or what the thermal load of thousands of servers does to regions already near dangerous temperatures. The tension is that the facilities are clustering in exactly the regions where water and grid stress are most acute, and State policies attach almost no conditions to the incentives they offer.

Why is the scale of the build-out itself the problem?

1. A fourfold expansion in four years: Capacity nearly tripled from 520 megawatts (MW) in 2020 to nearly 1.5 GW today. The 6.5 GW projected for 2030 compresses the next round of growth into four years.
2. Electricity demand more than quadruples: Demand from data centres is expected to rise from about 13 terawatt-hours (TWh) in 2024 to roughly 57 TWh by 2030. The Union Ministry of Power estimates that artificial intelligence alone will add 26.3 GW of new demand by 2031-32.
3. States compete on incentives, not conditions: Maharashtra wants to be the data centre capital. Telangana has declared data centres “essential services”. Karnataka is reviewing its policy to attract more, and Rajasthan is offering tax exemptions and cheap land.

Why does data centre water use collide with groundwater stress?

1. The volume per facility: A 100 MW data centre consumes about 2 million litres of water daily, equal to the daily use of roughly 6,500 households. India’s data centres consumed an estimated 150 billion litres in 2024-25, projected to more than double to 358 billion litres annually by 2030.
2. Clustering in the most stressed regions: Rajasthan extracts 147.11 per cent of its annual groundwater recharge, the second highest rate in the country. Several groundwater assessment units in Maharashtra are classified as semi-critical. Telangana’s Irrigation Minister confirmed in May 2026 that 16 districts were under groundwater stress.
3. Cities already rationing: Hyderabad’s surface water supply dropped 20 per cent in the summer of 2024 on poor monsoon recharge, forcing the water board to ration supply. Mumbai’s reservoirs stood at 44.5 per cent of capacity in March 2026.
4. Unaccounted in every State policy: No State policy requires public disclosure of daily water consumption. None requires a hydrogeological assessment before approval. None mandates that water sourcing must not compete with agriculture or municipal supply.

Why can the grid not deliver the power the boom needs?

1. Record peaks and interconnection queues: Maharashtra’s peak demand hit 27,230 MW in April 2026, the highest ever handled by the State utility. Two-year waits for 220 kV grid interconnections across the country are lengthening project timelines.
2. Renewable power is being thrown away: India curtailed 300 gigawatt-hours of renewable energy in the first quarter of 2026 alone because the grid could not carry it, per an Ember Energy analysis of Central Electricity Authority data. Over five years India has met only about 80 per cent of its annual transmission targets, one in four major transmission schemes runs a year or more behind schedule, and 20 GW of renewable capacity faces connectivity delays of more than four months.
3. Wires lag panels: Rajasthan and Gujarat house the bulk of utility-scale solar and wind. Both face the longest queues at pooling stations (substations where several renewable plants aggregate output before it enters the transmission grid). Solar projects are being built faster than the lines to carry their power.
4. The coal default: Data centres need reliable, uninterrupted electricity. If renewable power cannot reach them, the power comes from coal, adding to the emissions India is trying to curtail.

How do data centres make their surroundings hotter?

1. The satellite evidence: A March 2026 University of Cambridge study of 20 years of NASA satellite data found that data centres raise land surface temperatures by an average of 2 degree Celsius within a 10 km radius, with extreme cases reaching 9.1 degree Celsius. About 340 million people globally live within these affected zones.
2. Indian cities are already at the edge: Mumbai’s land surface temperature rose from 40.9 degree Celsius in 2003 to 47.3 degree Celsius in 2023, driven largely by urbanisation and heat-trapping infrastructure. Hyderabad’s urban heat island intensity ranges from 5.74 to 6.82 degree Celsius, its urban area doubled between 2001 and 2020, and it recorded temperatures above 43 degree Celsius in the summer of 2024.
3. The feedback loop: Data centres generate heat, and that heat raises ambient temperature. Higher ambient temperature increases cooling demand. Higher cooling demand raises electricity consumption. Unless that electricity is fully renewable, emissions rise and feed the climate change that is making India hotter.

Do State policies ask for anything in return for their incentives?

1. Generous on incentives: State policies offer electricity duty exemptions, transmission charge waivers, stamp duty relief and fast-track clearances.
2. Silent on conditions: None of the major State policies requires a grid impact assessment before commissioning, mandatory renewable energy sourcing, or a thermal load assessment for surrounding communities.
3. Telangana guarantees power in a stressed State: The “essential services” classification guarantees data centres uninterrupted power even during shortages, in a State where 16 districts face groundwater stress and temperatures have reached 47 degree Celsius.
4. Maharashtra diluted its own mandate: The State’s policy originally required 100 per cent renewable energy for core operations. In June 2026 it cut the requirement to 51 per cent, framed as improving project viability.
5. The exceptions, and their limit: Gujarat’s Data Centre Policy 2026-29 mandates at least 51 per cent green energy sourcing. Karnataka’s IT Minister told the Assembly in March 2026 that the State was reviewing its policy over water and energy concerns, and Tamil Nadu has linked incentives to renewable compliance. Even where mandates exist, enforcement and verification remain weak.

Why is the constraint market design rather than generation capacity?

1. Capacity is not the bottleneck: The Union Ministry of Power holds that India’s generation pipeline can absorb the additional demand from data centres. The constraint is market design and transmission infrastructure.
2. Price grid services separately: The Council on Energy, Environment and Water (CEEW) argues for climate-intelligent power markets in which short-term markets pay separately for ramping, storage and demand response.
3. Storage at the pooling station: Ember calculates that roughly 3 to 4 GW of two-hour battery storage at renewable pooling stations could have absorbed most of the generation curtailed in early 2026. The technical pieces exist; the gap is regulatory and commercial.

What should a national sustainability framework contain?

1. Enforceable use standards: CEEW proposes phased power and water use standards with enforceable benchmarks, and a national AI Energy Star rating that lets buyers and regulators compare how energy efficient a facility or model actually is.
2. Who pays for the grid: The Institute for Energy Economics and Financial Analysis (IEEFA) warns that a significant part of the associated infrastructure cost could be socialised. Where wider grid infrastructure is required, government support or dedicated financing should stop the cost being passed to consumers through higher tariffs.
3. Siting away from stressed hubs: IEEFA points to coastal locations. These offer proximity to near-shore wind and solar, and seawater cooling without desalination. Most facilities instead cluster around Mumbai, Hyderabad, Bengaluru and the National Capital Region, where water and grid stress are most acute.
4. Four minimum standards: A national framework would set minimum standards for renewable energy sourcing, water consumption disclosure, grid impact assessment and thermal load evaluation. It would give investors one set of expectations and consumers one set of protections, on the premise that environmental constraints are economic constraints.

Challenges to a national data centre framework

1. Split jurisdiction: Water is a State List subject and electricity sits on the Concurrent List, so a Central standard on water sourcing or grid impact binds no State unless the State adopts it. Eg. The Ministry of Electronics and Information Technology’s draft National Data Centre Policy of 2020 addressed infrastructure status and single-window clearance, not resource standards.
   The Fix: Route the standards through the Central Electricity Authority’s technical standards and the Bureau of Energy Efficiency, which already bind connected consumers, and tie Central incentive money to State adoption.
2. Mandates without metering: A renewable sourcing mandate is only as good as the verification behind it, and discoms already miss the obligations they carry. Eg. State distribution companies have missed Renewable Purchase Obligation targets for years, forcing the Ministry of New and Renewable Energy to renotify trajectories.
   The Fix: Require third-party audited reporting of power usage effectiveness and water usage effectiveness (ratios of total facility energy and water to that used by computing equipment) as a condition of every incentive.
3. Cooling technology is a trade-off, not a free fix: Liquid and immersion cooling cut water use but raise capital cost and still dump heat locally. Eg. Evaporative cooling, the cheapest option at 45 degree Celsius, is also the most water intensive.
   The Fix: Set the water standard by climate zone rather than one national number, so a coastal seawater-cooled site and an inland Rajasthan site face different limits.

Conclusion

The data centres will be built, and the only open question is on whose terms. The unresolved tension is between States competing on incentives and a resource base that no State policy has been made to account for. What to watch is whether the Centre converts the four standards, renewable sourcing, water disclosure, grid impact and thermal load, into an enforceable national framework before the projected capacity is locked in. The nearer marker is whether Karnataka’s policy review produces conditions or only more incentives.

Back2Basics

1. Urban heat island: An urban heat island is the difference in temperature between a built-up city and its rural surroundings, caused by concrete, asphalt and roofs absorbing and re-emitting heat that vegetation and soil would have released through evaporation.
2. Intensity: Its intensity is that temperature gap in degrees, so Hyderabad’s 5.74 to 6.82 degree Celsius means the city runs that much hotter than its surroundings at the same hour.
3. Why data centres add to it: Servers convert almost all the electricity they draw into heat, and cooling systems reject that heat into the surrounding air or water, so a large facility acts as a fixed heat source inside the island.

“[2026] Which of the following statements with regard to Green Hydrogen is/are correct?

1. It is decarbonized hydrogen obtained from natural gas reforming combined with carbon capture and storage (CCS).

2. It is produced using electrolysis of water with electricity generated by renewable energy.

3. National Green Hydrogen Mission of India aims for abatement of nearly 50 MMT of annual greenhouse gas emissions by 2030.

(a) 1 only (b) 2 and 3 only (c) 2 only (d) 1, 2 and 3

Why in the News

Insufficient transmission lines have emerged as a major obstacle to India’s renewable energy expansion, with many solar projects being curtailed during daylight hours, a rating agency assessment released on 19 August 2026 found. The constraint has shifted the binding limit on India’s energy transition from how fast capacity can be built to how much of it the grid can actually carry, and new project bidding has collapsed in response.

What is curtailment of renewable power?

1. Forced reduction of output: Curtailment occurs when a power generator is forced to reduce or stop producing electricity because of oversupply and grid congestion, even though the plant is capable of generating.
2. Why solar is hit hardest: Solar output peaks in the middle of the day, when several projects on the same corridor feed in simultaneously and demand is not correspondingly high, so the surplus cannot be evacuated.
3. What it costs the generator: A curtailed unit is generation permanently lost, since sunlight cannot be stored without additional storage capacity, and the fixed cost of the asset continues to accrue against a smaller output.
4. Scale of the problem: Around 37% of renewable energy capacity at substations affected by curtailment in the northern, western and southern regions operates under short term access arrangements, and this capacity faces 30% to 50% curtailment during the day.

What is Temporary General Network Access?

1. Short term use of spare grid capacity: Temporary General Network Access (T-GNA) is a short term arrangement that allows a renewable energy project to use available capacity on the inter-State transmission system, typically for periods ranging from a single time block to about 11 months.
2. Why it is precarious: T-GNA gives no firm entitlement to evacuate power, so projects operating under it are particularly vulnerable to curtailment, which raises their operational costs and, on prolonged use, reduces the supplier’s revenues.

What is the inter-State transmission system?

1. The national transmission backbone: The inter-State transmission system is the network of high voltage lines and substations that carries power across State boundaries, planned centrally and operated as a single national grid, on which access rights are allotted separately from generation approvals.

What is a Power Purchase Agreement?

1. The contract that makes a project bankable: A Power Purchase Agreement (PPA) is the long term contract under which a distribution company or intermediary agrees to buy a defined quantity of power from a generator at an agreed tariff, and without a signed PPA a project has no assured revenue stream against which lenders will disburse.

What is firm and dispatchable renewable energy?

1. Renewable power with an assured supply obligation: Firm and dispatchable renewable energy (FDRE) is renewable generation contracted with an obligation to supply a specified quantum during specified hours, achieved by combining solar, wind and storage, so that the buyer receives a guaranteed profile rather than whatever the weather delivers.

What is round the clock renewable power?

1. Renewable supply across all 24 hours: Round the clock (RTC) power is a contracting structure in which the developer commits to supply renewable energy across every hour of the day at a specified availability, again by combining complementary sources with storage.

How severe is the curtailment, region by region?

1. The affected regions: Curtailment at substations has been recorded in the northern, western and southern regions, the three regions carrying the bulk of India’s solar and wind capacity.
2. Share on temporary access: Around 37% of renewable capacity at affected substations across these three regions operates under T-GNA.
3. The daily loss: Capacity operating under T-GNA faces 30% to 50% curtailment during daylight hours.
4. Western region: About 55% of the affected capacity in western India was under T-GNA, and peak curtailment reached 8,617 MW as of 6 August 2026.
5. Northern region: The corresponding peak curtailment figure for the northern region was 5,573 MW.
6. What the concentration means: The western region, which hosts the largest solar and wind clusters, is also the region most dependent on temporary access, so the two vulnerabilities compound rather than offset.

Why has new capacity bidding collapsed even as construction continues?

1. Construction pipeline remains large: More than 150 GW of renewable projects were under construction as of 30 June 2026.
2. Awards have fallen sharply: After 40.6 GW was awarded in 2024-25, awards fell to 14.7 GW in 2025-26 and stood at only 4.7 GW through 10 August 2026.
3. Contracts awarded but not signed: Between 40 GW and 45 GW of capacity with bids already awarded remained without signed PPAs as of April 2026.
4. Delays in firming PPAs: Delays in converting awarded bids into signed PPAs are identified as an impediment independent of the transmission constraint.
5. Land acquisition: Land acquisition for both generation sites and transmission corridors continues to stall projects.
6. Distribution company finances: The financial position of distribution companies limits their willingness to sign long term purchase obligations at all, since a new PPA adds a fixed payment liability to a stressed balance sheet.
7. The bidding mix is changing: New bidding is shifting toward firm and dispatchable renewable energy and round the clock power, which require storage and therefore carry a higher tariff than plain solar.

Is the binding constraint on India’s energy transition generation capacity or grid capacity?

1. The generation side is not the problem: More than 150 GW is under construction and renewable energy including large hydro is projected to account for more than 35% of electricity generation by 2029-30, against 22% in 2024-25.
2. The evacuation side is: Capacity is being commissioned faster than transmission corridors are being built, which is why up to half of the output of projects on temporary access is being discarded during the hours it is generated.
3. The market has already priced the constraint: New awards fell from 40.6 GW to 4.7 GW in eighteen months, which is the developer response to a corridor that cannot carry what is already built.
4. Storage is the second missing input: Timely execution of intra-State and inter-State transmission infrastructure, along with greater storage capacity, is identified as critical to sustaining renewable additions, because a line that is congested at noon is idle at night.
5. Why this reframes the target: A target expressed in installed capacity measures what has been built, while a target expressed in share of generation measures what actually reaches consumers, and curtailment is precisely the gap between the two.

How is transmission and renewable infrastructure financed in India?

Source: Backgrounder, Infrastructure Financing.docx

1. Why bank lending failed: Commercial banks funded 25 to 30 year infrastructure assets with one to three year deposits, and this asset liability mismatch produced stressed assets crossing Rs 10 lakh crore in Indian banking by 2017.
2. National Bank for Financing Infrastructure and Development: Established in 2021 under a dedicated Act of Parliament as India’s first dedicated infrastructure development finance institution, providing non recourse long term financing with 20 to 30 year tenors that match infrastructure asset life.
3. Its scale: As of December 2025 it had sanctioned approximately Rs 3.03 lakh crore and disbursed approximately Rs 1.09 lakh crore.
4. Partial Credit Enhancement: It partially guarantees bonds issued by infrastructure companies and special purpose vehicles, upgrading their credit rating from BBB to AA or AAA so that insurance companies and pension funds can participate, with the first such facility sanctioned in February 2026.
5. Sector specific development finance institutions: REC and PFC finance power generation, transmission and distribution by raising long term bonds and lending to State electricity boards and private power companies.
6. POWERGRID InvIT: The first Infrastructure Investment Trust in the power sector, set up in 2020, with proceeds channelled into new and under construction transmission projects.
7. How an InvIT recycles capital: The sponsor transfers only the right to collect revenues for a defined concession period and receives upfront capital which it reinvests in new projects, while ownership is never transferred and the asset reverts at the end of the concession.
8. The SEBI safeguard: SEBI requires a minimum of 80% of InvIT assets to be in completed operational projects, which protects investors from construction risk, and InvITs may raise debt up to 49% of asset value.
9. Infrastructure Risk Guarantee Fund: Announced in the 2026-27 Budget, it provides partial guarantees to lenders financing infrastructure projects, covering a portion of the loss on default so that lenders extend credit where they previously refused, while the partial cover preserves due diligence incentives.
10. Sovereign green bonds: Issued by the Government of India since 2022-23 with proceeds ring fenced for renewable energy, clean transport and sustainable water management, establishing a sovereign benchmark for long term green paper.
11. The recycling logic: The architecture is designed so that the government builds, the asset stabilises and generates revenue, the asset is monetised through an InvIT, and the capital returns to fund the next tranche of the National Infrastructure Pipeline without a fresh budget allocation each cycle.
12. Monetisation targets: The National Monetisation Pipeline 2.0, announced in February 2026, targets Rs 16.72 lakh crore including private sector investment of Rs 5.8 lakh crore over 2025-26 to 2029-30, nearly three times the first pipeline’s target.

Challenges to India’s Renewable Energy Expansion

1. Transmission build lags generation build: A solar park can be commissioned in about a year while a high voltage corridor takes several years, so the two cannot be commissioned in step. e.g. peak curtailment in western India reached 8,617 MW as of 6 August 2026 on capacity that was already generating.
2. Temporary access gives no firm evacuation right: Projects on T-GNA can be curtailed at the system operator’s discretion, which makes their revenue unpredictable and their debt harder to service. e.g. around 37% of affected capacity across three regions runs on T-GNA and faces 30% to 50% daytime curtailment.
3. Storage capacity is inadequate to absorb the midday surplus: Without batteries or pumped hydro the same corridor is congested at noon and underused at night. e.g. the shift in new bidding toward firm and dispatchable and round the clock contracts is itself an admission that plain solar without storage no longer clears.
4. Distribution company finances limit offtake: Loss making distribution utilities avoid signing new long term purchase obligations irrespective of tariff. e.g. 40 GW to 45 GW of awarded capacity remained without signed PPAs as of April 2026.
5. Right of way and land acquisition for transmission corridors: Transmission lines cross many districts and require sustained land and forest clearances along the whole route. e.g. land acquisition is named alongside transmission constraints as an independent impediment to project completion.
6. Geographic concentration of resource: Solar and wind resources are concentrated in a few States while demand centres lie elsewhere, so the transition is dependent on long distance evacuation. e.g. the western and northern regions together account for the two largest curtailment figures recorded.
7. Tariff pressure from cheap early bids: Projects awarded at very low tariffs in earlier competitive rounds have thin margins that curtailment erases entirely. e.g. the collapse of awards from 40.6 GW in 2024-25 to 4.7 GW through August 2026 shows developers withdrawing rather than bidding lower.
8. Grid stability with high variable renewable share: A grid carrying more than 35% renewable generation needs inertia, frequency response and balancing reserves that thermal plants currently supply. e.g. must run thermal capacity has to be retained and paid for even as it operates at low plant load factors.
9. Module and cell supply chain dependence: Domestic content requirements raise capital costs while imported modules expose projects to trade policy shocks. e.g. changes in duty on imported solar cells and modules have repeatedly reset project economics after bids were submitted.
10. Delayed payments to generators: Payment delays by distribution utilities strain developer working capital independently of curtailment. e.g. the late payment surcharge rules had to be framed specifically to enforce a payment discipline that contracts alone did not achieve.

Conclusion

India’s renewable programme has moved past the point where generation capacity is the constraint, and the evidence for that is a 150 GW construction pipeline coexisting with up to 50% daytime curtailment on capacity that is already running. The market has responded not by building more but by bidding less, with awards falling from 40.6 GW to 4.7 GW in eighteen months, and by shifting toward firm and dispatchable contracts that price the constraint into the tariff. Whether renewable energy reaches more than 35% of generation by 2029-30 now depends on the execution of intra-State and inter-State transmission lines and on storage capacity, not on the pace of solar commissioning.

“[2022, GS3, 15 marks] Do you think India will meet 50 percent of its energy needs from renewable energy by 2030 ? Justify your answer. How will the shift of subsidies from fossil fuels to renewables help achieve the above objective? Explain.”