Elkhorn Battery Energy Storage System
Pacific Gas and Electric CompanyMonterey County
Elkhorn is PG&E's 182.5 MW / 730 MWh four-hour battery at Moss Landing, built with 256 Tesla Megapacks. EIA listed the generator as out of service in June 2026; an April 2026 CPUC proposed decision said it had been offline since June 2, 2025, with no definitive return date reported by PG&E as of February 27, 2026.
Mapped infrastructure geometry associated with this asset.
Illustrative BESS equipment layout for comparing sites. Not an as-built site map.
EIA plant 62564 · Inventory for Aug 2026.
No operating capacity reported in this inventory.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| ELKHO | Batteries | Planned | 182.5 | 730 |
Mapped infrastructure geometry associated with this asset.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| ELKHO | 182.5 MW 182.5 MW summer | Batteries Electricity used for energy storage · BA | Apr 2022 | 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.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Project milestones and public references behind the asset profile.
EIA-860 lists generator ELKHO with this operating date.
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 | |
|---|---|---|---|
| Diablo Canyon | 2,323 MW | CA | |
| Helms Pumped Storage | 1,053 MW | CA | |
| Colusa Generating Station | 712.4 MW | CA | |
| Gateway Generating Station | 619.7 MW | CA | |
| James B Black | 168.6 MW | CA | |
| Humboldt Bay | 167 MW | CA | |
| Poe | 142.8 MW | CA | |
| Pit 5 | 141.6 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Elkhorn Battery Energy Storage System reports No operating capacity reported of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Elkhorn Battery Energy Storage System is a Lithium-ion battery storage facility in Monterey County, CA, participating in the CAISO market.
Elkhorn Battery Energy Storage System is in Monterey County, CA, inside the CAISO balancing area.
Elkhorn Battery Energy Storage System is operated by Pacific Gas & Electric Co. according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Elkhorn Battery Energy Storage System reported 0 MWh 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, Elkhorn Battery Energy Storage System ranks #88 of 1,061 operating plants of the same technology nationally. It ranks #20 of 272 in CA.