Fallbrook Energy Storage
San Diego Gas & Electric CompanySan Diego County
Fallbrook Energy Storage is SDG&E’s original 40 MW / 160 MWh lithium-ion battery facility in northern San Diego County. SDG&E announced that it began commercial operation in May 2023; the August 2026 EIA inventory lists plant 61365 as operating. Its four-hour rating belongs to this original facility. The adjacent Fallbrook 2 project has a separate 29.6 MW procurement scope, so the utility’s rounded 70 MW Fallbrook portfolio label should not replace this plant’s 40 MW rating. The facility stores electricity for later dispatch through CAISO energy markets.
EIA plant 61365 · Inventory for Aug 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| FBES | Batteries | Operating | 40 | 40 |
This EIA plant 61365 is the original 40 MW / 160 MWh facility. SDG&E’s rounded 70 MW Fallbrook portfolio label includes a separate expansion scope; it is not the nameplate rating of this original plant.
Source: SDG&E June 2026 electric-generation testimony · as of 2026-06
SDG&E’s July 2023 completion announcement states that the 40 MW Fallbrook project began commercial operation in May 2023. Dates in earlier planning documents were forecasts and should not replace that reported milestone.
Source: SDG&E Fallbrook completion announcement · as of 2023-07-06
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Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| FBES | 40 MW 40 MW summer | Batteries Electricity used for energy storage · BA | Mar 2023 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
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SDG&E procured the 40 MW Fallbrook project through its Track IV preferred-resources local-capacity requirements solicitation in response to CAISO-identified local capacity needs.
EIA-923 reports gross generation and net grid exchange for storage plants. Gross generation is shown as a discharge proxy; it is not a cycle count or conventional capacity factor.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Palomar Energy | 559 MW | CA | |
| Miramar Energy Facility | 106 MW | CA | |
| Cuyamaca Peak Energy Plant | 48.7 MW | CA | |
| Fallbrook Energy StorageCurrent | 40 MW | CA | |
| Top Gun Energy Storage | 30 MW | CA | |
| Melrose BESS | 20 MW | CA | |
| Elliott Energy Storage | 10 MW | CA | |
| Boulevard Energy Storage | 10 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioThe California Public Utilities Commission approved the AES–SDG&E build-own-transfer contract for the Fallbrook Battery Energy Storage System. The approved design specified 40 MW lithium-ion technology with four-hour discharge duration and an expected online date of March 31, 2021.
EIA-860 lists generator FBES with this operating date.
SDG&E announced the completion of the Fallbrook Energy Storage facility as the second-largest asset in its utility-owned energy storage portfolio. The facility participates in CAISO energy markets and can be dispatched to help balance statewide electricity supply and demand.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
This EIA plant 61365 is the original 40 MW / 160 MWh facility. SDG&E’s rounded 70 MW Fallbrook portfolio label includes a separate expansion scope; it is not the nameplate rating of this original plant.
SDG&E’s July 2023 completion announcement states that the 40 MW Fallbrook project began commercial operation in May 2023. Dates in earlier planning documents were forecasts and should not replace that reported milestone.
Fallbrook Energy Storage reports 40 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Fallbrook Energy Storage is a batteries facility in San Diego County, CA, participating in the CAISO market.
Fallbrook Energy Storage is in San Diego County, CA, inside the CAISO balancing area.
Fallbrook Energy Storage is operated by San Diego Gas & Electric Co according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Fallbrook Energy Storage reported 38 GWh over the twelve months to 2026-07. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
By capacity, Fallbrook Energy Storage ranks #350 of 1,061 operating plants of the same technology nationally. It ranks #113 of 272 in CA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.