# El Cajon Energy Storage

CAISO asset profile · https://askthegrid.com/assets/facilities/el-cajon-energy-storage

San Diego Gas & Electric Company - San Diego County - CAISO

El Cajon Energy Storage is SDG&E’s 7.5 MW / 30 MWh lithium-ion battery at an El Cajon substation in San Diego County. Its energy-to-power rating corresponds to four hours at rated output. EIA’s August 2026 inventory lists generator SES as operating, with an operating month of February 2017. AES supplied the Advancion system, using Samsung SDI batteries and Parker Hannifin power conversion equipment. El Cajon and the larger Escondido battery were procured together but are separate facilities.

## Metrics

- **Nameplate capacity:** 7.5 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 60569 — plant-60569
- **EIA energy capacity:** 30 MWh — August 2026 generator SES inventory; 7.5 MW rated power.

## Facts

- **Technology:** Batteries
- **Operator:** San Diego Gas & Electric Company
- **Operating status:** Operating

## Related parties

- **Owner / operator:** San Diego Gas & Electric Company — Owner and operator ([source](https://www.sdge.com/))
- **EPC contractor / O&M provider:** AES Energy Storage LLC — Turnkey EPC contractor and long-term service contractor ([source](https://www.aes.com/))
- **Equipment supplier:** Samsung SDI — Battery supplier ([source](https://www.samsungsdi.com/))
- **Construction partner:** Dynalectric San Diego — Construction contractor ([source](https://dyna-sd.com/case-studies/energy/san-diego-gas-and-electric-aes-energy))
- **Balancing authority / market operator:** California Independent System Operator (CAISO) — Wholesale market operator and balancing authority ([source](https://www.caiso.com/))
- **Regulator:** California Public Utilities Commission (CPUC) — Regulator and contract approver ([source](https://www.cpuc.ca.gov/))
- **Parent company:** Sempra — Parent company of SDG&E ([source](https://www.sempra.com/))

## Sources

- [api.eia.gov](https://api.eia.gov/v2/electricity/operating-generator-capacity/data?api_key=DEMO_KEY&data[0]=nameplate-capacity-mw&end=2026-07&facets[plantid][]=60569&frequency=monthly&start=2026-07) — api.eia.gov · authoritative — Source retained for exact-record publication review.
- [blog.fluenceenergy.com](https://blog.fluenceenergy.com/aes-to-deploy-37-5-mw-of-advancion-energy-storage-arrays-for-sdge) — blog.fluenceenergy.com · public_source — Source retained for exact-record publication review.
- [docs.cpuc.ca.gov](https://docs.cpuc.ca.gov/PublishedDocs/Published/G000/M166/K269/166269958.PDF) — docs.cpuc.ca.gov · authoritative — Source retained for exact-record publication review.
- [docs.cpuc.ca.gov](https://docs.cpuc.ca.gov/PublishedDocs/SupDoc/A2106004/4425/440141987.pdf) — docs.cpuc.ca.gov · authoritative — Source retained for exact-record publication review.
- [dyna-sd.com](https://dyna-sd.com/case-studies/energy/san-diego-gas-and-electric-aes-energy) — dyna-sd.com · public_source — Source retained for exact-record publication review.
- [mbrweb.ferc.gov](https://mbrweb.ferc.gov/SearchMBRAssetAppendix/AssetAppendixDetails?AssetAppendixId=13677) — mbrweb.ferc.gov · authoritative — Source retained for exact-record publication review.

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Canonical page: https://askthegrid.com/assets/facilities/el-cajon-energy-storage
Website: [San Diego Gas & Electric Company](https://www.sdge.com/)

Source: Ask the Grid — https://askthegrid.com/