Calaveras County Water District · Calaveras County · CAISO
Collierville Powerhouse is a hydroelectric facility with 253 MW of EIA-reported operating capacity in Calaveras County, California, registered as EIA Plant ID 54555. Northern California Power Agny is the registered plant entity or operator. The facility interconnects at Collierville Substation at 230 kV.
Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.
EIA-reported plant capacity; other capacity bases are withheld pending reconciliation.
Primary generation technology.
Northern California Power Agny · Calaveras County · CAISO
Collierville Powerhouse is operating.
230 kV · Northern California Power Agency
Conventional Hydroelectric
Collierville Powerhouse is operating.
230 kV · Northern California Power Agency
CAISO
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| GEN1 | 126.5 MW 126.5 MW summer | Conventional Hydroelectric Water · HY | Nov 1989 | Operating |
| GEN2 | 126.5 MW 126.5 MW summer | Conventional Hydroelectric Water · HY | Nov 1989 | 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 Federal Power Commission, FERC's predecessor, issued the North Fork Stanislaus River Hydroelectric Project license, FERC P-2409, to Calaveras County Water District.
CAISO · Calaveras County
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 | |
|---|---|---|---|
| Lodi Energy Center | 288.9 MW | CA | |
| Collierville PowerhouseCurrent | 253 MW | CA | |
| Geothermal 1 | 110 MW | CA | |
| Geothermal 2 | 55 MW | CA | |
| Alameda | 54.8 MW | CA | |
| Combustion Turbine Project No 2 | 50 MW | CA | |
| Spicer Meadow Project | 5.9 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioCCWD signed a contract for the approximately $267 million North Fork Stanislaus hydroelectric development. Sierra Constructors, a joint venture of Guy F. Atkinson Co. of California and Harrison Western Construction, was identified as the builder; construction was scheduled to begin in June and finish by November 1989.
EIA-860 lists generator GEN1, generator GEN2 with this operating date.
FERC approved a partial license transfer covering the Collierville and Spicer Meadows transmission lines to NCPA. This was a transmission-facility transfer, not a documented acquisition or sale of Collierville Powerhouse.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Collierville Powerhouse has a reported capacity of 253 MW. Source: EIA Form 860.
Collierville Powerhouse is a Conventional Hydroelectric facility in Calaveras County, CA, participating in the CAISO market.
Collierville Powerhouse is in Calaveras County, CA, inside the CAISO balancing area.
Collierville Powerhouse is operated by Northern California Power Agny according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Collierville Powerhouse reported 397.6 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.
Collierville Powerhouse interconnects at Collierville Substation, on the Northern California Power Agency system.
By capacity, Collierville Powerhouse ranks #57 of 1,349 operating plants of the same technology nationally. It ranks #7 of 210 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.
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