The Monsoon Can Fail. India's Power Grid Must Not.

The El Niño of 2026 has exposed a weakness in India's electricity system. The monsoon delivered 13% less rainfall than normal, while national peak electricity demand reached a record 271 gigawatts (GW) in May and stayed close to that level through much of the monsoon. The July–September peak was roughly 40 GW, or 18%, higher than a year earlier, defying the seasonal decline that normally accompanies the rains. Hydropower generation fell 20% during July–September, with around 13 GW less available during peak-demand hours. But the regional differences were striking: hydropower fell 33% in the South and 22% in the West, while remaining relatively resilient elsewhere.

The mechanism is simple. Hot, dry weather raises demand for cooling and irrigation, while weak rainfall reduces hydropower precisely when flexible electricity is needed most. Air-conditioning is making electricity demand more seasonal and persistent into the night, especially in cities such as Delhi and Mumbai. Together, these pressures contributed to India's worst electricity shortages in more than three years.

April–May 2027 could be worse. Reservoirs have entered the dry season with less water, and El Niño is forecast to continue into early 2027. If temperatures soar, cooling demand may rise while hydro remains constrained. Limited additional thermal capacity is scheduled to come online before summer. India needs a response that can be deployed quickly.

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Yet 2026 also demonstrates what India got right: a growing diversity of electricity resources. Solar generation rose by 34% and wind by 12%, helping meet India's rising electricity demand. Much of this growth came from record renewable capacity additions, including utility-scale, rooftop and agricultural solar across different regions. Importantly, however, their seasonal generation patterns remained broadly consistent with historical trends. Unlike hydropower, solar and wind did not experience comparable disruptions during the El Niño year.

The electricity market made the benefits of this diversity visible. During solar-rich afternoons, low-cost generation frequently produced an energy surplus: Indian Energy Exchange prices routinely hovered around ₹2 per unit or lower. After sunset, however, this surplus turned into scarcity. Coal plants helped fill the gap—supplying about 21 GW more in June than a year earlier—but thermal generation and constrained hydropower could not fully meet evening demand. Exchange prices repeatedly hit the ₹10-per-unit ceiling. The lesson is not that India has too much renewable energy; it lacks enough flexibility and energy storage to deliver cheap power when it is most needed.

Geographical diversity also provides insurance against weather risk. Clouds over Rajasthan do not necessarily coincide with clouds over Tamil Nadu. Wind strengthens during the monsoon, when solar typically weakens. And unlike higher latitude regions such as Germany, where winter solar generation can fall to 15–20% of summer levels, India's weakest month delivers roughly 80% of its strongest across a geographically diverse fleet.

Our study simulating 120 solar-plus-battery plants in 18 Indian states over ten historical weather years, including El Niño and La Niña, illustrates this advantage. Individual solar plants experienced prolonged cloudy spells, but coordinated operation across states supplied a constant power target over  99% of modeled hours. These results assume substantial storage, adequate transmission and coordination; nevertheless, a portfolio can be far more reliable than its individual plants.

What should India do?

First, make April–May 2027 an emergency storage priority. Set a target of 15 GW / 60 GWh storage, at existing solar sites where grid connections are idle after sunset. But be realistic: only projects already awarded or under construction are plausible candidates for commissioning before summer. Over 100 GW of battery storage projects have already applied for transmission connectivity at existing solar plants. Prioritize those projects now, and remove connection and approval bottlenecks. Batteries can charge on abundant afternoon solar and discharge at the hours of greatest scarcity. Waiting for new conventional plants will not solve the immediate problem.

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Second, make diversity an explicit goal of the next renewable buildout. Continue investing across states and resource types—including utility-scale, rooftop and agricultural solar, wind and storage—based on how projects complement the national fleet, not simply their individual tariffs. Build interstate transmission to move electricity from unaffected regions to those under weather stress. High-temperature, low-sag conductors can roughly double the capacity of suitable existing lines without new rights-of-way, subject to network constraints.

Third, make cooling efficiency a multi-year resilience strategy. Room ACs alone add 10-15 GW each year to weather-sensitive peak demand, totaling about 180 GW by 2035. Stronger efficiency standards can avoid up to 50 GW of that peak, reduce consumer bills and relieve the grid during heatwaves, when supply is already strained.

Fourth, make electricity demand responsive. Enable frictionless open access so industries can procure abundant, low-cost clean power during solar-rich hours. Allow large consumers to respond to real-time electricity prices, with forward contracts and hedging to manage price risks. Offer incentives to industries and commercial buildings to shift or reduce consumption during grid stress through demand-response and resilience programmes. Agricultural demand is already being shifted towards solar hours through dedicated solar feeders. Even brief, coordinated AC compressor pauses across thousands of buildings can provide valuable flexibility without significantly affecting comfort. Consumers should be rewarded for helping balance the grid, not simply asked to endure shortages.

India cannot control the monsoon. It can control whether a bad monsoon becomes a power crisis.