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Home Batteries Power California Grid
21 Sep
Summary
- Over 140,000 home batteries supplied power.
- Capacity equaled a large power plant.
- Event occurred during extreme heat.
On the evening of September 9, 2026, more than 140,000 home batteries across California collectively supplied over 580 megawatts of peak power to the state's energy grid. This historic dispatch, involving Sunrun and Tesla customers, demonstrated the capability of distributed energy resources to function as a significant power source, comparable to a large conventional power plant.
The large-scale event occurred during a period of extreme heat and high electricity demand. To help manage the grid, batteries discharged power for three hours. This action aimed to increase the grid's operating margin and reduce real-time energy prices, benefiting all Californians. Participating batteries were distributed statewide, supporting all three major investor-owned utility service territories.
This significant grid support was coordinated through the California Energy Commission's Demand Side Grid Support program and the California Public Utilities Commission's Emergency Load Reduction Program. The event's trigger was a high wholesale energy price, highlighting the economic viability and grid-serving potential of residential battery systems when integrated effectively.
