India recorded a peak power demand of 256.1 GW on April 25, 2026, with solar plants supplying 21.5 percent of the afternoon load — a historic high. Yet the same day told a more sobering story: solar contributed only 10.8 percent of daily generation across the full 24-hour period and a negligible 0.1 percent of evening needs after sunset. Simultaneously, India was forced to curtail 2.3 terawatt-hours of solar generation in 2025 — equivalent to 18 percent of average monthly solar output — because the absence of adequate battery storage made it impossible to absorb excess generation without destabilising the grid. States that paid for this curtailed electricity reimbursed producers without receiving any power.
The India Meteorological Department has forecast a below-normal monsoon at 92 percent of the Long Period Average for 2026 — the first such warning in 11 years — which will increase daytime cooling demand precisely when solar should be doing the heaviest lifting. Yet without storage, the late afternoon and evening hours when demand peaks after sunset will continue to be met by coal and gas, regardless of how much solar capacity India installs.
💡 Get AI-powered exam prep on your phone!
This issue represents one of India’s most critical infrastructure policy challenges: the disconnect between ambitious renewable energy capacity targets and the storage, transmission, and grid integration infrastructure required to make that capacity actually useful. For UPSC aspirants, it combines environmental policy, economic planning, energy security, and technological infrastructure in a single analytically rich topic.
Background and Context: India’s Renewable Trajectory and the Storage Gap
Five Important Key Points
- India’s solar capacity share of total installed electricity capacity has nearly doubled from approximately 15 percent in 2022 to nearly 28 percent in early 2026, yet solar’s share of generation on peak-demand days only increased from 5.6 percent in 2022 to 10.8 percent in April 2026, demonstrating the growing gap between installed capacity and usable output.
- In 2025, India curtailed 2.3 terawatt-hours of solar generation between May and December — with 0.9 TWh wasted in October alone — because insufficient battery storage capacity prevented absorption of excess afternoon generation into the evening demand peak, creating a fiscal cost for power that was generated but never delivered.
- India had only 0.7 GWh of battery energy storage systems (BESS) operational by end-2025, with another 2 GWh expected by December 2026 — numbers that are orders of magnitude below what is required to meaningfully shift solar generation from midday excess to evening peak demand.
- Standalone two-hour battery storage tariffs fell from approximately Rs 2.21 lakh per MW per month in early 2025 to Rs 1.48 lakh by year-end — a 33 percent cost reduction in a single year — indicating that battery economics are improving rapidly, making the storage buildout increasingly feasible if policy execution matches the opportunity.
- India’s renewable capacity grew by over 210 percent in the past decade, and renewable energy accounted for 89 percent of new capacity additions in FY 2024-25, yet absolute fossil fuel import dependence remains entrenched because the renewable buildout has not yet reduced India’s reliance on imported crude, gas, and coal for baseload and peak power.
The Solar Curtailment Problem: A Policy and Infrastructure Failure
Solar curtailment — the deliberate reduction of solar generation below what plants are capable of producing — occurs when the grid cannot absorb the electricity being generated. In India’s case, the primary driver is the absence of storage. Midday solar generation in states like Rajasthan, Gujarat, and Tamil Nadu now exceeds local demand and transmission capacity. Grid operators must either curtail generation or risk frequency imbalances that could cause cascading failures.
The economic cost of curtailment is concrete and borne by taxpayers. Under most power purchase agreements, distribution companies must pay generators even for curtailed electricity — electricity that was “taken” from the generator but never flowed to consumers. When 2.3 TWh is curtailed annually, the compensation runs into hundreds of crores at current tariff levels. This represents a direct fiscal cost of the storage gap, making battery investment not merely an environmental choice but a fiscal responsibility.
Battery Storage Economics and the Policy Imperative
The falling cost of battery storage is one of the most significant trends in global energy. Globally, lithium-ion battery pack prices have fallen from over $1,000 per kilowatt-hour in 2010 to under $100 per kilowatt-hour in 2024-25. This dramatic cost reduction is driven by Chinese manufacturing scale, improvements in cell chemistry, and supply chain maturation. India’s domestic battery manufacturing ecosystem, while nascent, is being supported through the Production Linked Incentive (PLI) scheme for Advanced Chemistry Cell (ACC) batteries — with Rs 18,100 crore allocated for 50 GWh of domestic manufacturing capacity.
The PLI-ACC scheme is necessary but insufficient. Manufacturing incentives create supply; offtake creates demand. India needs to mandate co-located BESS alongside utility-scale solar projects above a threshold size, establish a BESS procurement trajectory similar to the renewable purchase obligation mechanism, and provide viability gap funding for grid-scale storage projects in states with high curtailment rates. The National Electricity Plan and the Electricity (Amendment) Act framework should be updated to include storage mandates.
Grid Architecture and Transmission Constraints
Battery storage alone cannot solve India’s solar utilisation problem. Even if storage is available at generation sites, the electricity must reach demand centres through adequate transmission infrastructure. India’s inter-regional transmission capacity, managed by Power Grid Corporation of India (PGCIL), has improved significantly but remains a bottleneck in several corridors — particularly the north-south corridor connecting Rajasthan and Gujarat’s solar surplus to the southern states.
The Green Energy Corridors project, funded partly through KfW (German development bank) and AIIB (Asian Infrastructure Investment Bank), has added dedicated transmission capacity for renewable energy, but the pace of transmission expansion still lags behind solar capacity addition. A solar plant that cannot evacuate power to the grid is economically stranded even if technically operational.
Environmental and Climate Dimensions
India’s Nationally Determined Contribution (NDC) under the Paris Agreement includes achieving approximately 50 percent of cumulative electric power installed capacity from non-fossil fuel-based energy resources by 2030. Solar energy is central to meeting this target. However, NDC commitments are defined in terms of installed capacity, not generation share. A country can technically meet its capacity target while continuing to rely heavily on coal for actual electricity generation if storage and grid integration are inadequate.
India’s 2025 solar curtailment of 2.3 TWh represents approximately 2 million tonnes of CO2-equivalent emissions that were effectively “wasted” — solar potential that, had it been stored and used, would have displaced coal generation. Building storage infrastructure is therefore directly a climate action measure, not merely an energy management one.
The below-normal monsoon forecast for 2026 adds urgency. Reduced hydropower generation from lower reservoir levels will require thermal power plants to compensate during evening hours. A robust BESS infrastructure could instead shift stored solar generation to these hours, reducing both fossil fuel dependence and carbon emissions.
Way Forward
The Union Ministry of Power should immediately issue a mandatory co-location storage order requiring all new solar projects above 500 MW to include a minimum of two hours of BESS capacity. The Central Electricity Regulatory Commission should update power purchase agreement frameworks to allow storage dispatch obligations. The Green Hydrogen Mission and BESS deployment should be coordinated under a single National Clean Energy Storage Authority to avoid institutional fragmentation. State electricity boards in high-curtailment states (Rajasthan, Tamil Nadu, Gujarat) should receive viability gap funding specifically for grid-scale storage through an enhanced Revamped Distribution Sector Scheme mechanism. Finally, India should leverage its G20 presidency legacy to establish a multilateral battery storage technology partnership that accelerates access to cell chemistry innovations outside Chinese supply chains.
Relevance for UPSC and SSC Examinations
This topic is directly relevant to UPSC GS Paper III under “Infrastructure: Energy, Ports, Roads, Airports, Railways etc.”; “Conservation, Environmental Pollution and Degradation”; “Government Schemes and their Outcomes”; and “Achievements of Indians in Science and Technology.” For the Essay paper, themes of sustainable development, India’s green transition, and energy justice draw from this material. Key terms: Battery Energy Storage Systems (BESS), solar curtailment, PLI-ACC scheme, Nationally Determined Contribution, Green Energy Corridors, grid integration, PGCIL, National Electricity Plan, peak demand, capacity factor. For SSC examinations, geography of India’s energy resources, environmental current affairs, and government schemes on renewable energy are all standard coverage areas.