Pala Energy Storage Yard
San Diego Gas & Electric Company (SDG&E)San Diego County
Pala Energy Storage Yard is SDG&E’s battery site beside Pala Substation in San Diego County. EIA’s August 2026 inventory lists SES2 operating at 1 MW / 2 MWh and the older 0.5 MW SES1 unit retired in December 2021. A separate Eos demonstration at the yard used a 125 kW / 500 kWh zinc-aqueous battery; its project history is separate from the utility generators’ current capacity.
EIA plant 60566 · Inventory reporting month unavailable.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| SES1 | Batteries | Operating | 0.5 | Unknown |
| SES2 | Batteries | Operating | 1 | Unknown |
EIA’s August 2026 preliminary inventory lists SES2 as operating at 1 MW / 2 MWh. SES1, rated 0.5 MW / 1.5 MWh, is on the retired sheet with retirement month December 2021. Adding the two power ratings would mix operating and retired capacity.
Source: www.eia.gov exact-project record · as of 2026-08
The CEC’s October 2023 report describes a separate 125 kW / 500 kWh Eos Gen 2.3 demonstration hosted at Pala. It reports operation by the end of 2021 and a construction-related interruption starting September 2022. That historical demonstration does not establish the current capacity or chemistry of SES2.
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Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| SES1 | 0.5 MW 0.5 MW summer | Batteries Electricity used for energy storage · BA | Dec 2012 | Operating |
| SES2 | 1 MW 1 MW summer | Batteries Electricity used for energy storage · BA | Aug 2015 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
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Project milestones and public references behind the asset profile.
Generator SES1 at 0.5 MW listed in FERC records with operating year 2012.
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 | |
|---|---|---|---|
| Vanadium Redox Flow Battery Plant | 2 MW | CA | |
| Borrego Springs Energy Storage | 1.5 MW | CA | |
| Ortega Highway Energy Storage | 1 MW | CA | |
| Pala Energy Storage YardCurrent | 1 MW | CA | |
| Canyon Crest Academy | 1 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioEIA-860 lists generator SES1 with this operating date.
Generator SES2 at 1.0 MW listed in FERC records with operating year 2015.
EIA-860 lists generator SES2 with this operating date.
Eos Gen 2.3 Energy Block became commercially operational at the end of 2021.
The August 2026 EIA retired-generator sheet records SES1, rated 0.5 MW / 1.5 MWh, retired in December 2021. SES2 remains operating.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
EIA’s August 2026 preliminary inventory lists SES2 as operating at 1 MW / 2 MWh. SES1, rated 0.5 MW / 1.5 MWh, is on the retired sheet with retirement month December 2021. Adding the two power ratings would mix operating and retired capacity.
The CEC’s October 2023 report describes a separate 125 kW / 500 kWh Eos Gen 2.3 demonstration hosted at Pala. It reports operation by the end of 2021 and a construction-related interruption starting September 2022. That historical demonstration does not establish the current capacity or chemistry of SES2.
Pala Energy Storage Yard reports 1.5 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Form 860M.
Pala Energy Storage Yard is a batteries facility in San Diego County, CA, participating in the CAISO market.
Pala Energy Storage Yard is in San Diego County, CA, inside the CAISO balancing area.
Pala Energy Storage Yard is operated by SDGE Batteries according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Pala Energy Storage Yard reported 0 MWh over the twelve months to 2022-12. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
By capacity, Pala Energy Storage Yard ranks #899 of 1,061 operating plants of the same technology nationally. It ranks #202 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.