Sunrun and Tesla Say Home Batteries Sent a Record 745 MW to California's Grid on Oct. 6. Here's What It Means for Powerwall Owners

California's home batteries just had their biggest night yet. In a release on Wednesday, Oct. 14, 2026, Sunrun said residential batteries run by Sunrun and Tesla delivered 669 MW to the state's grid on the evening of Oct. 5 and a record 745 MW on Oct. 6, during a multi-day heat wave. Sunrun calls them the two largest residential distributed power plant dispatches in U.S. history. It says 745 MW was enough to power every household in San Francisco and San Jose combined at peak.

How the record was set

According to Sunrun, the California Energy Commission and the utilities asked for the dispatches, and the two companies discharged home batteries over multi-hour evening peaks. Both nights, the state's Demand Side Grid Support (DSGS) program kicked in after the grid operator's day-ahead locational marginal price passed $200 per megawatt-hour. Sunrun says Oct. 5 was also the first time this year that DSGS and the utilities' Emergency Load Reduction Program (ELRP) called events at the same time across all participating investor-owned utility territories.

The record has been climbing fast. Sunrun lists 539 MW on July 29, 2025, 580 MW on Sept. 9, 2026, then 669 MW and 745 MW on back-to-back October evenings.

Tesla's own number for the same night

Tesla Energy reported its share separately. On Oct. 8 it posted that on Tuesday, Oct. 6, more than 85,000 California Powerwall owners sent over 600 MW to the grid. TeslaNorth, reading the dashboard Tesla attached, gives the exact figures: 85,774 participating homes, 601 MW of participating peak power and 932 MWh delivered over the evening. Tesla called that the largest Powerwall virtual power plant (VPP) event so far.

The two figures can't simply be added up or subtracted. Neither company has said how much of the 745 MW came from Tesla's fleet, and TeslaNorth notes that Tesla's post doesn't say whether Sunrun-operated Powerwalls were counted in the 85,774. In September, by comparison, the companies said 517 MW of the 580 MW total came from about 110,000 Powerwalls, more than half of them owned and run by Sunrun.

What owners get paid

Neither release says what participants earn for these two nights. TeslaNorth points to the programs behind them. The CPUC 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 each extra kilowatt-hour discharged during an event. Tesla paid $9.9 million to U.S. VPP participants in 2024. The better-paying DSGS program has been tight this year: in a May 2026 CPUC filing, Tesla said a DSGS budget shortfall had "forced" it to move thousands of customers to ELRP.

More events could come. ELRP can still call hot-evening events through the end of October, TeslaNorth notes. Sunrun also says a Google-funded distributed power plant with PG&E in the San Jose area, which aims to enroll nearly 21,000 existing devices from Sunrun, Tesla and Everyday Electric, is expected to start its first dispatches this month. Sunrun's own forward-looking statements say that initiative is still under a non-binding letter of intent.

What it means for owners: If you have a Powerwall in California and are enrolled in Tesla's VPP, this is the kind of evening the program pays for. Check your Backup Reserve setting in the Tesla app before the next heat wave; it controls how much energy stays in the battery for an outage, and you can opt out of individual events. For investors, it's a sign that Tesla's installed Powerwall base is becoming a grid resource, though Tesla doesn't break out VPP revenue. Q3 results are due after the close on Wednesday, Oct. 21.