India's Evening Fossil Ramp Rises 22 GW Even as Midday Solar Cuts Thermal Output
Solar hit 10% of global power in H1 2026, but India's non-sunny hour fossil burn is climbing faster than daytime cuts can offset.
India's fossil generation during non-sunny hours averaged 168 GW in H1 2026, up 22 GW from the same period in 2023, according to an Ember report published on 12 August. At 7 p.m., output peaked at 174 GW, nearly 50 GW above the midday low. Coal is ramping up after sunset to fill the gap that solar leaves behind.5
Solar's advance in India is real. Midday fossil generation averaged 125 GW at 1 p.m. in H1 2026, down from 135 GW at the same hour in H1 2023, Ember found. India's solar share of the power mix reached a record 10.9% in Q1 of fiscal year 2026-27, crossing 10% for the first time, Asian Power reported on 4 August (2026-08-04). Yet even as peak demand hit 271 GW, renewable output faced curtailment because the grid cannot absorb all the midday supply now being added.5,3
Globally, the picture looks cleaner. Solar supplied 10% of world electricity in H1 2026, up from 8.9% in H1 2025 and 5.6% in H1 2023, putting it ahead of wind in the global generation mix for the first time, Ember said. Solar met more than 25% of global electricity demand between 11 a.m. and 2 p.m. on the average day in H1 2026, dropping to near zero between 8 p.m. and 5 a.m. Total global solar generation doubled from 769 TWh in H1 2023 to 1,564 TWh in H1 2026.5
China drove most of that growth. In 2025, the country likely added more than 300 GW of solar and 100 GW of wind, both records for any country ever, Carbon Brief analysis published in May (2026-05-19) showed. Chinese electricity demand still grew 5% year-on-year, yet non-fossil sources covered the entire increase, pushing coal generation down 1.6%, a fall of 90 TWh. India's coal output dropped 3.0%, or 46 TWh, in the same year.1
That simultaneous coal decline in both countries is historically unusual. It was the first such drop in half a century, Carbon Brief noted. The two countries' power sectors drove 93% of the rise in global CO2 emissions from 2015 to 2024, so any sustained reduction in their coal burn carries outsized weight for global emissions trajectories.1
But the headline coal numbers do not tell the full daily story in India. Daytime fossil output falls while the sun shines. After sunset, thermal plants ramp hard to cover the gap. The 22 GW rise in non-sunny hour fossil output since H1 2023 means total daily fossil burn is not declining as fast as the midday trough implies.5
Solar's global advance also has not displaced fossil fuels at the consumption level. Renewables supplied only about 40% of the increase in global energy demand, according to an Oilprice.com analysis published on 13 August (2026-08-13). Solar can grow 30% in a year while global fossil fuel consumption still rises, because electricity demand and transport fuels are expanding faster than clean capacity can displace them.4
In Asia broadly, the shift is already reshaping competitive dynamics. Solar overtook gas to become the continent's third-largest electricity source, Carbon Brief analysis from 12 June (2026-06-12) showed. LNG-fired plants in several Asian markets are being pushed increasingly into evening and overnight hours, a pattern India's own dispatch data now illustrates in stark form.2
Batteries are the variable that could change the calculus. Ember estimated that storage additions of 459 GWh expected in 2026 could shift 34% of new daily solar generation into non-sunny hours, flattening the evening ramp and reducing the call on thermal capacity. Whether actual deployment tracks that estimate through H2 2026 is the number to watch, given that curtailment is already rising even as India sets demand records.5
The curtailment problem during the day and the ramp problem after sunset are two sides of the same grid constraint. India is adding solar faster than its transmission infrastructure can absorb, while simultaneously needing more dispatchable capacity once the sun goes down. Battery additions that fall short of Ember's 459 GWh estimate would leave that gap unclosed and keep coal firmly in the evening dispatch stack.5,3