85,774 California Powerwalls Just Broke a Grid Record That Lasted Less Than a Month

Tesla’s California Virtual Power Plant dashboard for Tuesday’s grid event. Credit: Tesla Energy/X

More than 85,000 Powerwall owners across California sent over 600 megawatts of stored power into the state’s grid on Tuesday evening, according to Tesla Energy, a new high for the company’s home battery Virtual Power Plant.

Tesla Energy posted the result on X at 9:59 a.m. PT on Thursday, calling it “a new record for the largest Powerwall VPP event” and pointing out that it came “less than a month later” than the previous one. The dashboard screenshot attached to the post gives the exact figures: 85,774 participating homes and 601 MW of participating peak power.

The same dashboard shows 932 megawatt-hours delivered during the October 6 evening event. Tesla’s whole California Powerwall fleet, counting homes that weren’t part of the event, peaked at 634 MW. Spread across every participating home, that works out to about 7 kilowatts per house at the peak.

The discharge lined up with the day’s peak on California’s grid. Data from the California Independent System Operator shows statewide demand reached 45,622 MW at 5 p.m. on Tuesday, and daily peaks topped 44,000 MW on Monday, Tuesday and Wednesday.

A Virtual Power Plant ties thousands of home batteries together so they can be dispatched like one large generator when the grid is stretched. The chart shows how that plays out over a day: the fleet charges through the middle of the day, then pours power out into the evening peak. Owners set a Backup Reserve in the Tesla app to keep energy for outages, and they can opt out of an event.

The previous Powerwall mark came on September 9, when Tesla Energy said about 69,000 California owners were sending more than 500 MW to the grid during a heatwave. Twelve days later, Sunrun and Tesla said their combined fleets had delivered 580 MW that same evening, including 517 MW from 110,000 Powerwalls, more than half of them owned and operated by Sunrun. Tuesday’s 601 MW tops both numbers.

California Powerwall owners in the VPP are paid through state programs, chiefly the Energy Commission’s Demand Side Grid Support (DSGS) program and the utilities’ Emergency Load Reduction Program (ELRP). The California Public Utilities Commission says ELRP pays $2 per kilowatt-hour to non-residential participants, a group that includes VPP aggregators, and when PG&E and Tesla launched their pilot in 2022, they said Powerwall owners would get $2 for every extra kilowatt-hour discharged during an event. Tesla paid out $9.9 million to VPP participants across the U.S. in 2024.

The richer DSGS program has been squeezed this year. In a May 2026 filing with the CPUC, Tesla said it had been “forced to transition thousands of customers” across all three big investor-owned utilities from DSGS to ELRP “because of DSGS’s budget shortfall.”

Tesla’s post doesn’t say which program or utility called Tuesday’s event, how much participating owners will earn from it, or whether any Sunrun-operated Powerwalls were counted in the 85,774. It also stopped short of calling 601 MW a record for all residential batteries, a title Sunrun and Tesla claimed together in September.

ELRP events can still be called on hot evenings through the end of October, so Tuesday may not be the fleet’s last outing of the season. Given that September’s record lasted 27 days, anyone watching Tesla’s dashboard on the next scorcher shouldn’t get too attached to 601 MW.