RMI Estimates Battery Dispatch Avoided $29 Million in California Peak Energy Costs
- Grid Services & Demand Response News Utility-Scale BESS
Marin Holt
- 0
- 6 minutes read
- California peak energy costs avoided, July 2024: $29 million
- Battery supply in peak hours, July 2024: 717 GWh
- Texas share in most stressed hours of 2025: 6%–9%
- National battery tax collections: $290 million
- Potential annual health savings: $400 million
Utility-scale batteries avoided an estimated $29 million in California peak energy costs in July 2024, according to RMI. Batteries displaced higher-cost generation and supplied 717 GWh during peak hours that month.
The savings sit alongside reliability contributions in California and Texas, local tax receipts and projected health benefits from replacing gas peaker generation. RMI examined those impacts in Stored Potential, its assessment of utility-scale battery storage.
During California’s September 2022 heatwave, batteries delivered 6% of electricity demand at the moment of record peak demand, according to RMI. During the most stressed hours of California’s seven tightest days of 2024, batteries operated at 64% of installed capacity. Gas peakers operated at 67%.
In Texas, batteries supplied 6%–9% of electricity during the most grid-stressed hours of 2025, RMI said. They delivered up to 7 GW of fast-responding power.
Participation rules also carried a price. On Dec. 5, 2025, a day with otherwise normal grid conditions, a market rule change led many Texas batteries to reduce their participation in ancillary services. An analysis cited by RMI put the added wholesale cost at about $3.6 million over 24 hours.
Local revenue and community payments
RMI reported nationwide battery-related tax collections exceeding $290 million. In Medway, Massachusetts, a battery project’s host community agreement includes a $250,000 sidewalk fund and a $50,000 contribution for water and environmental planning.
The agreement also provides $50,000 a year for a community resilience fund, according to pv magazine USA. Homeowners within 300 feet qualify for up to $25,000 each if they demonstrate a loss in property value.
Health savings depend on displaced generation
RMI projected $5.3 million in annual health savings for Suffolk County from replacing a 500 MW New York gas peaker with a battery. The analysis used EPA tools.
Nationwide, RMI estimated potential annual health savings exceeding $400 million if the 66 GW of storage expected online by 2030 displaced existing gas peaker generation. That projection ties the health benefit to which plants lose operating hours.
Why It Matters
RMI’s California findings connect battery dispatch with lower peak energy costs and substantial output during stressed hours. The Texas example attaches a wholesale cost to reduced participation in ancillary services.
For host communities, the benefits also include tax receipts and negotiated payments such as Medway’s resilience funding. Looking toward 2030, RMI’s projected health savings depend on storage displacing gas peaker generation.
Critical Perspective
RMI estimates potential annual health savings exceeding $400 million, conditional on expected storage displacing existing gas peaker generation. The article does not establish that the projected battery fleet will actually replace those plants’ operating hours. Its Texas example also shows that market participation rules can change battery behavior and impose wholesale costs even under otherwise normal grid conditions. What evidence will RMI use to verify that battery additions cause the peaker displacement assumed in its health estimate?
