PG&E pays a large premium for that power, do you know nothing at all about the subject? See others on this thread who participate in these programs.
"The Tesla and PG&E ELRP will compensate you $2.00 for every additional kWh that your Powerwall delivers during an event beyond typical behavior. As of 2024, there will be a minimum of seven events each year. Typically, customers can earn up to $20 per Powerwall per event. If the California grid has a significant number of emergencies, however, there could be as many as 60 hours of events. This can result in customers earning between $200 and $600 per Powerwall, depending on the number of emergency events during the summer. Other factors, including your Powerwall’s energy capacity and charge behavior, play a role into your total compensation."
Hardly a large premium for a 5-10k instillation. At the stated rate it should only take ~50 years for ROI. Sign me up!