Renewable Energy And Storage Solve Massive Grid Problem In US

Texas's power grid has a history of strain during hot weather, but that's changing. For years, the state's grid operator, ERCOT, regularly asked residents to cut back on electricity use to avoid blackouts, issuing nearly 50 such appeals between 2008 and 2022. This summer, despite record heat and demand topping 91 gigawatts for the first time, ERCOT didn't issue a single one. The reason: a surge in solar power and battery storage. Solar alone made up 36% of the Texas grid this year, up from a combined 20% for wind and solar in 2023, and the added batteries can now supply power during the evening hours when demand peaks and solar output fades. That shift has also lowered wholesale electricity costs, from around $85 per megawatt-hour during peak times in 2023 to about $46 this year.

Part of this trend involves linking home solar panels and batteries into networks called virtual power plants, which store energy when renewable output is high and feed it back to the grid when needed. Texas is becoming a hub for this approach, and companies are expanding programs that let homeowners participate. Octopus Energy, for instance, is launching a US app to help households sign up for utility incentive programs, and is also offering home battery storage without the upfront purchase cost. A similar project called SHARE just launched in the Bay Area, connecting battery-equipped heat pumps and home batteries with utility PG&E, aiming to lower costs for participating households while adding capacity to the grid.