Tesla Powerwalls supply most of record 745 MW California grid dispatch

Sunrun Tesla Powerwalls did most of the heavy lifting as California’s home batteries set a new grid record. On October 6, more than 85,000 Powerwall owners sent over 600 MW to the grid, the bulk of a combined 745 MW dispatch that Sunrun announced. That is 28% more than the 580 MW record the two companies set less than a month ago, and bigger than most gas peaker plants in the state.

Tesla Energy put out its own numbers on October 8, two days after the event. The company stated that over 85,000 Powerwall owners across California dispatched more than 600 MW to help meet peak demand, calling it a new record for the largest Powerwall VPP event. Sunrun followed with a release stating that the companies delivered 669 MW on October 5 and 745 MW on October 6, though it did not break out how much came from Sunrun customers versus Tesla customers.

Comparing Tesla’s figure against Sunrun’s total shows that Powerwalls account for roughly 80% of the record. In September, the share was even higher, with 517 MW of the 580 MW coming from about 110,000 Powerwalls, of which Sunrun owns or operates 55%. Sunrun is the largest Powerwall channel in the country. Tesla’s math reveals that just over 600 MW from about 85,000 homes works out to roughly 7 kW per home, well above the 5 kW continuous output of a Powerwall 2, pointing to a fleet increasingly made of Powerwall 3 units rated at 11.5 kW and homes with multiple batteries.

The events took place during an October heat wave at the request of the California Energy Commission and the state’s utilities. Batteries discharged through multi-hour evening peaks to cut demand and push down real-time power prices. According to Sunrun, October 5 was the first event this year where the state’s Demand Side Grid Support (DSGS) and Emergency Load Reduction Program (ELRP) both called dispatches at the same time across every participating investor-owned utility territory. DSGS kicks in once CAISO’s day-ahead price passes $200/MWh. Sunrun notes that 745 MW is enough to cover every household in San Francisco and San Jose combined during peak hours. The company now has more than 120,000 home batteries enrolled in California grid programs.

The previous residential record of 539 MW stood from July 29, 2025, until September 9, 2026, growing 8% in over a year and then 28% in four weeks. Customers are compensated for helping strengthen grid reliability.

Looking ahead, Sunrun announced that a Google-funded distributed power plant with PG&E in the San Jose area plans to enroll nearly 21,000 devices with Tesla and Everyday Electric, formerly known as Renew Home. Initial dispatches are expected this month, marking the first concrete piece of the 16.8 GW virtual power plant plan for data centers announced in June by Tesla, Sunrun, and Renew Home, though the Tesla and Everyday Electric part of the project remains under a non-binding letter of intent.