Tesla, Sunrun VPP Delivers Record 580 MW to California Grid — SkimNews
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- Sunrun and Tesla dispatched a record 580 MW from 140,000-plus home batteries onto California's grid during a September 9 heat wave — the largest residential distributed power plant event ever recorded — running for a three-hour evening window when air-conditioning load was peaking.
- Of those batteries, roughly 110,000 Tesla Powerwalls delivered 517 MW (Sunrun says it owns or operates 55% of them), while 30,000-plus batteries from other manufacturers in Sunrun's fleet contributed the remaining 63 MW — enough to power every household in Sacramento County at peak.
- The dispatch ran through two programs: the California Energy Commission's DSGS, which auto-triggered once the day-ahead price crossed $200/MWh, and the CPUC's Emergency Load Reduction Program (ELRP), called directly by utilities as the heat wave peaked.
- A follow-up dispatch the next evening, September 10, pulled another 140-plus MW at Southern California Edison's request.
- Sunrun CEO Mary Powell said the distributed fleet operates at a scale larger than many peaker power plants combined, noting typical natural gas peakers run 50 to 250 MW.
- A Brattle Group report cited by Sunrun projects up to $206 million in net savings for Californians by 2028 from this style of dispatch, with homeowners in the programs paid for power fed back to the grid.
- In June, Tesla, Sunrun, and Renew Home announced a separate 16.8 GW virtual power plant aimed at data centers — the same residential-storage model running live at smaller scale in the September 9 dispatch.
Why it matters: Grid operators secured 580 MW of peak capacity from 140,000 home batteries in a three-hour window — outpacing typical natural gas peakers (50-250 MW each) without building new plants that would sit idle most of the year. California homeowners enrolled in DSGS/ELRP get paid for the power they feed back, and a Brattle Group report cited by Sunrun projects up to $206 million in net savings for Californians by 2028.
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