Elliott Energy Storage
San Diego Gas & Electric Company (SDG&E)San Diego County
Elliott Energy Storage is SDG&E’s battery microgrid at Elliott Substation in Tierrasanta, San Diego. EIA’s August 2026 inventory lists 10 MW / 10 MWh and operating month March 2024. Separately, SDG&E’s August 2024 financing report describes a 10 MW / 40 MWh microgrid completed that March. The original procurement specified 50.5 MWh at beginning of life, including a microgrid reserve; these are distinct source-specific ratings.
Mapped infrastructure geometry associated with this asset.
EIA plant 66278 · Inventory for Aug 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 1 | Batteries | Operating | 10 | 10 |
EIA’s August 2026 inventory reports 10 MW / 10 MWh. SDG&E’s August 2024 financing report describes a 10 MW / 40 MWh project. The 2022 procurement approval specified 50.5 MWh at beginning of life and 40 MWh at end of life. Different source dates and bases are retained without inferring a completed modification.
Source: sempra.com exact-project record
The CPUC approval describes Elliott C1266 in Tierrasanta, with a 1.5 MWh microgrid reserve and the ability to support designated local facilities during outages. That reserve is part of the project configuration, rather than additional capacity to add to its energy rating.
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 10 MW 10 MW summer | Batteries Electricity used for energy storage · BA | Mar 2024 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Decision D.21-12-004 set the microgrid project program in motion, with reliability benefits targeted for the summers of 2022 and/or 2023.
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 Storage | 40 MW | CA | |
| Top Gun Energy Storage | 30 MW | CA | |
| Melrose BESS | 20 MW | CA | |
| Elliott Energy StorageCurrent | 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 portfolioSDG&E's WDAT queue records show the Elliott project energized on October 18, 2023, and the project marked completed with full-capacity interconnection status.
The FERC plant-index record identifies Elliott Energy Storage, EIA Plant ID 66278, with an active date of November 1, 2023.
EIA-860 lists generator 1 with this operating date.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
EIA’s August 2026 inventory reports 10 MW / 10 MWh. SDG&E’s August 2024 financing report describes a 10 MW / 40 MWh project. The 2022 procurement approval specified 50.5 MWh at beginning of life and 40 MWh at end of life. Different source dates and bases are retained without inferring a completed modification.
The CPUC approval describes Elliott C1266 in Tierrasanta, with a 1.5 MWh microgrid reserve and the ability to support designated local facilities during outages. That reserve is part of the project configuration, rather than additional capacity to add to its energy rating.
Elliott Energy Storage reports 10 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Elliott Energy Storage is a batteries facility in San Diego County, CA, participating in the CAISO market.
Elliott Energy Storage is in San Diego County, CA, inside the CAISO balancing area.
Elliott 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.
Elliott Energy Storage reported 5.9 GWh over the twelve months to 2024-12. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
By capacity, Elliott Energy Storage ranks #488 of 1,061 operating plants of the same technology nationally. It ranks #154 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.