Sunrun and Tesla Dispatch 580 Megawatts To California's Grid During Heat Wave, Marking Largest Residential Distributed Power Plant Event In History

Sunrun and Tesla announced a historic energy dispatch on September 9, 2026, delivering over 580 megawatts of peak power to California's electricity grid during an extreme heat wave. Coordinated across more than 140,000 residential batteries—including 110,000 Tesla Powerwalls—the three-hour dispatch event provided enough electricity to power all households in Sacramento County during peak demand hours, successfully alleviating grid strain and wholesale energy price spikes. The dispatch was executed under California's Demand Side Grid Support (DSGS) and Emergency Load Reduction Program (ELRP). Tesla Powerwalls contributed 517 MW of the total capacity, with Sunrun managing 55% of those units alongside 30,000 third-party battery systems. A subsequent dispatch on September 10 delivered an additional 140 MW via Southern California Edison, demonstrating combined single-night potential exceeding 720 MW. This record-setting milestone demonstrates the rapid scaling of distributed energy resources and virtual power plants (VPPs) as viable alternatives to conventional peaker power plants. According to research from The Brattle Group, distributed battery networks could generate up to $206 million in net cost savings for California consumers by 2028, validating commercial partnerships with hyperscalers and utilities.