Calistoga Power Plant is a geothermal facility with 176.4 MW of EIA-reported nameplate capacity in Lake County, California, registered as EIA Plant ID 50066. Calistoga Unit 19 is part of The Geysers, which Calpine describes as the largest complex of geothermal power facilities in the world. The facility uses dry or superheated steam and contributes to The Geysers’ role in supplying about half of California’s in-state geothermal power.
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
Geysers Power Co LLC · Lake County · CAISO
Calistoga Power Plant is operating.
Geothermal
Calistoga Power Plant is operating.
CAISO
CAISO · Lake County
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| UNT1 | 88.2 MW 50 MW summer | Geothermal Geothermal · ST | Mar 1984 | Operating |
| UNT2 | 88.2 MW 50 MW summer | Geothermal Geothermal · ST | Mar 1984 | 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.
The California Energy Commission certified Unit 19, originally known as Occidental Geothermal Power Plant No. 1.
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Geysers Unit 5-20 | 1,236 MW | CA | |
| Calistoga Power PlantCurrent | 176.4 MW | CA | |
| Sonoma California Geothermal | 78 MW | CA | |
| Aidlin Geothermal Power Plant | 25 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioEIA-860 lists generator UNT1, generator UNT2 with this operating date.
The CEC approved transfer of the license from First Trust of California, National Association to Santa Fe Geothermal, Inc.
The CEC approved transfer from Santa Fe Geothermal, Inc. to Calistoga Geothermal Partners, LP; ESI subsequently renamed the operating entity Silverado Geothermal Resources, Inc., which sold the plant to Calistoga Geothermal Partners.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Calistoga Power Plant has a reported capacity of 176.4 MW. Source: EIA Form 860.
Calistoga Power Plant is a geothermal facility in Lake County, CA, participating in the CAISO market.
Calistoga Power Plant is in Lake County, CA, inside the CAISO balancing area.
Calistoga Power Plant is operated by Geysers Power Co LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Calistoga Power Plant reported 453.3 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
By capacity, Calistoga Power Plant ranks #2 of 63 operating plants of the same technology nationally. It ranks #2 of 30 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.
