Solar Plus Batteries Make Their Strongest Case In Texas
Texas’s grid operator ERCOT set an all-time demand record of roughly 91 GW on July 22, about 6 per cent above the 85.5 GW mark from August 2023, and then spent much of the summer breaking the old record again and again. What did not happen is the story. In 2023, ERCOT issued nearly a dozen conservation warnings and briefly declared a grid emergency. In 2026 it needed neither. Local paper The Houston Chronicle, which put the question to more than half a dozen grid experts, reports a unanimous answer: solar panels and batteries.
The numbers behind that verdict are stark. On the record days, solar output hit a new high of about 34.7 GW and batteries discharged a record 11.98 GW into the evening peak, leaving more than 20 GW of buffer between demand and committed generation. At the previous record in August 2023, Texas had roughly 4 GW of batteries online. CenterPoint Energy’s president, Jason Wells, told the paper that batteries let ERCOT call fewer gas plants into service during the evening surge and kept consumer prices flatter than a record summer would normally allow.
What the Peak Actually Looked Like
None of this makes Texas fossil-free. US Energy Information Administration data shows that at the 6 pm peak on July 22, gas supplied 48 per cent of demand and solar 32 per cent, and gas carried most of the night. ERCOT also expects demand to roughly double within six years as data centres arrive, which means the summer of 2026 is a first test, not a final result. But the hour that once broke grids, the early-evening peak after the sun fades, is now being shaved by batteries that charged on midday solar.
India’s Version of the Same Evening
India is running the same experiment with a very different toolkit. Demand crossed 270 GW in late May, and grid regulator Grid-India reported a late-evening deficit of about 2.57 GW. Clean capacity overtook fossil capacity in India in August, yet coal still supplies roughly 70 per cent of actual generation. An analysis of April’s 256 GW record noted that it was met without any storage in use, because every unit of solar was consumed as it was generated.
Storage is arriving, but from a low base. The India Energy Storage Alliance counts 8.5 GWh of operational battery capacity at the end of the first half of 2026, an eleven-fold rise in a year, against a Central Electricity Authority estimate of 411.4 GWh needed by 2031-32. The Ministry of Power now requires solar tenders to include co-located storage of at least two hours, sized at 10 per cent of the solar capacity, transmission charges are waived for qualifying projects, and the 2026-27 Budget exempted customs duty on components for making lithium-ion cells for stationary storage.
Pushed Versus Pulled
The contrast worth drawing is between a build-out pulled by price signals and one pushed by tenders. Texas’s battery fleet has grown several-fold in about three years, driven by market economics rather than mandates, according to KilowattLogic’s analysis, and CenterPoint says the payoff has shown up in flatter consumer prices. India’s tender-led model offers bankable contracts and control over the mix, but its pace is set by the tender calendar and by grid connectivity rather than by the evening price. Neither is obviously superior, but the Texas result shows us that evening revenue certainty is the variable that moves capital fastest.
India also has a cheaper lever that Texas never needed. Estimates claim that lowering the minimum operating level of coal plants from 55 to 40 per cent could free around 34 GW of room for daytime renewables without a single battery. Of course, thermal plant operators have contested this, and called it unviable. But the route clearly exiosts, as shown in Europe or even China.