Tesla Powerwalls did most of the heavy lifting as California’s home batteries set a new grid record last week. 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 today.

That’s 28% more than the 580 MW record the two companies set less than a month ago. And it’s bigger than most gas peaker plants in the state.

Sunrun and Tesla pulled a record 580 megawatts of power from home batteries onto California’s grid during a heat wave on September 9, the largest residential distributed power plant event ever recorded.

The dispatch pooled more than 140,000 home batteries across the state and ran for a three-hour window in the evening, when the grid was straining under air-conditioning load.

Tesla has launched Tesla Home, a home energy management platform powered by an AI engine called Opticaster that it says makes “hundreds of decisions” a day about when to store and use electricity to lower your bill.

However, it’s not an entirely new product as Electrek has been reporting on Tesla’s Opticaster for 5 years.