At 3:45 PM on May 21, India pulled 270.82 gigawatts from its grid — shattering the power demand record for the fourth straight day as the May heatwave pushed cooling loads to extremes. Your AC stayed on. That is the surprising part.
257 GW on May 18. Around 260 GW on May 19. 265.44 GW on May 20. Then 270.82 GW. Banda in Uttar Pradesh touched 48.2°C — among the worst of the heatwave hitting north India’s power grid. The IMD has heatwave warnings out for ten states. No one lost power at a national scale. A decade ago, this would have been a blackout story.
Who Actually Held the Grid Up
Coal. Coal provided 66% of generation at peak — 173.3 GW — ramping up and down as demand curved through the day. Solar contributed 24%, a real number, but only between sunrise and sunset. Renewables together met 30% of the peak. That sounds like a transition story. It isn’t, yet.
The flexibility is doing the work that the headlines about installed capacity can’t. India crossed 520 GW of installed capacity this decade. But capacity isn’t the same thing as the ability to follow a demand curve that climbs 13 GW in three days.
The Number Nobody Is Quoting
247 GW. That’s the night peak — the demand after sunset, when solar drops to zero and residential cooling stays on. The system met it, but spot electricity prices spiked, and some states with older grids saw brief outages. The day looks like a win. The evening looks like a warning.
There is no storage layer doing what coal is currently doing. Until there is, every additional gigawatt of solar makes the sunset cliff steeper, not gentler. The same problem is already curtailing 35 GW of solar capacity.
The grid won today. May isn’t over. The IMD’s heatwave forecast put summer demand at 275-285 GW. We just crossed 270 with a week left in May and June still ahead.
Coal can’t stretch forever. The monsoon, expected around May 26, decides whether this gets harder before it gets easier. India’s power demand record of 270 GW in the May 2026 heatwave was a stress test — and the next one will be steeper.