# Dark Sky Energy Center

CAISO asset profile · https://askthegrid.com/assets/facilities/dark-sky-energy-center

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

Dark Sky Energy Center is SDG&E’s battery addition to the Borrego Springs microgrid in San Diego County. The August 2026 EIA inventory lists one operating generator with 7.3 MW of nameplate capacity. SDG&E’s project reporting describes the system as 7.33 MW / 14.66 MWh; that project rating and EIA’s rounded inventory rating are identified separately. The installation is distinct from Borrego Springs Energy Storage’s older SES1 and SES2 batteries. SDG&E removed the proposed hydrogen-storage component from the project scope; it is not part of this battery installation.

## Metrics

- **Nameplate capacity:** 7.3 MW — Canonical EIA plant baseline.
- **Registry anchor:** Plant 66599 — plant-66599

## 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/))
- **Parent company:** Sempra — Parent company of SDG&E ([source](https://www.sempra.com/))
- **Balancing authority / market operator:** California Independent System Operator (CAISO) — Balancing authority; market operator ([source](https://www.caiso.com/))

## Sources

- [docs.cpuc.ca.gov](https://docs.cpuc.ca.gov/PublishedDocs/Efile/G000/M604/K023/604023801.PDF) — docs.cpuc.ca.gov · authoritative — Source retained for exact-record publication review.
- [mbrweb.ferc.gov](https://mbrweb.ferc.gov/SearchlkpEIA/Index?page=773) — mbrweb.ferc.gov · authoritative — Source retained for exact-record publication review.
- [sdge.com](https://www.sdge.com/) — sdge.com · public_source — Source retained for exact-record publication review.
- [sdge.com](https://www.sdge.com/sites/default/files/Borrego%20Springs%20BESS%20Additional%20Project%20Update%20Notification%20Letter%2002-20-24_0.pdf) — sdge.com · public_source — Source retained for exact-record publication review.
- [sdge.com](https://www.sdge.com/sites/default/files/Transmission-Level_Interconnection_Handbook_09232025.pdf) — sdge.com · public_source — Source retained for exact-record publication review.

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

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