# Collierville Powerhouse

CAISO Conventional Hydroelectric · https://askthegrid.com/assets/facilities/collierville-powerhouse

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.

## Key facts

- Technology: Conventional Hydroelectric
- Power capacity: 253 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CAISO
- Substation: Collierville Substation
- Point of interconnection: Collierville Substation
- Transmission owner: Northern California Power Agency
- Interconnection voltage: 230 kV

## Source-backed facts

- Owner logo domain: ccwd.org — case studies for the Collierville Powerhouse sump · confidence: medium
- Owner logo domain: ccwd.org — Homepage Calaveras County Water District · confidence: medium
- Identifiers: [{"value":"54555","system":"EIA plant"},{"value":"54555 / GEN1","system":"EIA generator"},{"value":"54555 / GEN2","system":"EIA generator"},{"value":"P-2409","system":"FERC project"},{"value":"CAISO","system":"ISO/RTO"},{"value":"COLLIERVILLE HYDRO UNIT 1 & 2 AGGREGATE","system":"CAISO market resource"}] — 2026 NQC List · confidence: medium
- Description: Collierville Powerhouse is a conventional hydroelectric plant in Calaveras County, California, identified by EIA plant ID 54555. The plant has two generating units totaling 253 MW and is part of the North Fork Stanislaus River Hydroelectric Development Project, FERC P-2409. Calaveras County Water District owns and licenses the project, while Northern California Power Agency operates it and transmits its output through the Collierville-Bellota transmission facilities to the PG&E Bellota substation. — Hydroelectric | NCPA · confidence: medium
- Identifiers.5: {"value":"COLLIERVILLE HYDRO UNIT 1 & 2 AGGREGATE","system":"CAISO market resource"} — 2026 NQC List · confidence: medium
- Parties.0: {"relationship":"Owner and FERC licensee","name":"Calaveras County Water District","official_url":"https://www.ccwd.org/"} — case studies for the Collierville Powerhouse sump · confidence: high
- Parties.1: {"relationship":"Project operator and joint developer","name":"Northern California Power Agency","official_url":"https://www.ncpa.com/"} — Hydroelectric | NCPA · confidence: high
- Product url: https://www.andritz.com/products-en/hydro/products/turbines-hydropower — Turbines · confidence: medium
- Product url: https://www.andritz.com/products-en/hydro/products/turbines-hydropower — Collierville Powerhouse, US · confidence: medium
- Manufacturer domain: andritz.com — Hydro service and rehabilitation in the USA · confidence: medium
- Product family: Pelton turbines — Turbines · confidence: medium
- Equipment models.1: {"manufacturer_domain":"andritz.com","product_url":null,"count":2,"unit_mw":null,"name":"140 MVA hydroelectric generator"} — Hydro service and rehabilitation in the USA · confidence: medium
- Significance: Collierville Powerhouse is a 253 MW renewable hydroelectric facility that averages more than 500 GWh of annual generation, reportedly enough to serve nearly 80,000 homes. Its output is transmitted through NCPA's 40-mile, 230 kV Collierville-Bellota facilities to PG&E's Bellota Substation and dispatched to NCPA members. — Source · confidence: medium
- Description: Collierville Powerhouse is a conventional hydroelectric facility in Calaveras County, California, with two generating units totaling 253 MW. It is part of the North Fork Stanislaus River Hydroelectric Project, FERC P-2409; Calaveras County Water District is the owner and FERC licensee, while Northern California Power Agency is the joint developer and operator. CCWD contracted in April 1985 for construction of the approximately $267 million development, which was to be built by Sierra Constructors, a joint venture of Guy F. Atkinson Co. of California and Harrison Western Construction, with completion scheduled for November 1989. The powerhouse entered service in November 1989, and its power is delivered through NCPA's Collierville-Bellota transmission facilities. — Source · confidence: medium
- Description: Collierville Powerhouse is a conventional hydroelectric facility in Calaveras County, California, with two generating units totaling 253 MW. It is part of the North Fork Stanislaus River Hydroelectric Project, FERC P-2409; Calaveras County Water District is the owner and FERC licensee, while Northern California Power Agency is the joint developer and operator. CCWD contracted in April 1985 for construction of the approximately $267 million development, which was to be built by Sierra Constructors, a joint venture of Guy F. Atkinson Co. of California and Harrison Western Construction, with completion scheduled for November 1989. The powerhouse entered service in November 1989, and its power is delivered through NCPA's Collierville-Bellota transmission facilities. — Source · confidence: medium
- Description: Collierville Powerhouse is a conventional hydroelectric facility in Calaveras County, California, with two generating units totaling 253 MW. It is part of the North Fork Stanislaus River Hydroelectric Project, FERC P-2409; Calaveras County Water District is the owner and FERC licensee, while Northern California Power Agency is the joint developer and operator. CCWD contracted in April 1985 for construction of the approximately $267 million development, which was to be built by Sierra Constructors, a joint venture of Guy F. Atkinson Co. of California and Harrison Western Construction, with completion scheduled for November 1989. The powerhouse entered service in November 1989, and its power is delivered through NCPA's Collierville-Bellota transmission facilities. — The Calaveras County Water District has signed a contract... - UPI Archives · confidence: medium
- Quality notes: ["EIA plant capacity is 253 MW, while CCWD's P-2409 relicensing materials report 256.8 MW for the broader project; these figures should not be treated as interchangeable.","FERC's February 1992 partial transfer concerned the Collierville and Spicer Meadows transmission lines transferred to NCPA, not a sale or transfer of the Collierville powerhouse itself.","The approximately $267 million figure is reported as the construction-project value, not as sale consideration or confirmed bond principal."] — P-2409 Relicense Homepage - Calaveras County Water District · confidence: medium
- Quality notes: ["EIA plant capacity is 253 MW, while CCWD's P-2409 relicensing materials report 256.8 MW for the broader project; these figures should not be treated as interchangeable.","FERC's February 1992 partial transfer concerned the Collierville and Spicer Meadows transmission lines transferred to NCPA, not a sale or transfer of the Collierville powerhouse itself.","The approximately $267 million figure is reported as the construction-project value, not as sale consideration or confirmed bond principal."] — ANNOTATED LICENSE - CURRENT FERC... · confidence: medium
- Quality notes: ["EIA plant capacity is 253 MW, while CCWD's P-2409 relicensing materials report 256.8 MW for the broader project; these figures should not be treated as interchangeable.","FERC's February 1992 partial transfer concerned the Collierville and Spicer Meadows transmission lines transferred to NCPA, not a sale or transfer of the Collierville powerhouse itself.","The approximately $267 million figure is reported as the construction-project value, not as sale consideration or confirmed bond principal."] — The Calaveras County Water District has signed a contract... - UPI Archives · confidence: medium
- Financing summary: NCPA project agreements provided for construction, operation, and financing of the North Fork Stanislaus development, with project participants purchasing rights to the project's capacity and energy. An NCPA project ordinance authorized temporary notes of up to $500 million outstanding at one time for preliminary, acquisition, and construction costs and contemplated public-power revenue bonds. Fitch reported that a recent upgrade of Collierville units 1 and 2 was financed with approximately $12.4 million of private-placement debt. No plant sale price or portfolio transaction value is disclosed. — Agenda Report - September 21, 1983 (42) · confidence: medium
- Financing summary: NCPA project agreements provided for construction, operation, and financing of the North Fork Stanislaus development, with project participants purchasing rights to the project's capacity and energy. An NCPA project ordinance authorized temporary notes of up to $500 million outstanding at one time for preliminary, acquisition, and construction costs and contemplated public-power revenue bonds. Fitch reported that a recent upgrade of Collierville units 1 and 2 was financed with approximately $12.4 million of private-placement debt. No plant sale price or portfolio transaction value is disclosed. — Source · confidence: medium
- Financing summary: NCPA project agreements provided for construction, operation, and financing of the North Fork Stanislaus development, with project participants purchasing rights to the project's capacity and energy. An NCPA project ordinance authorized temporary notes of up to $500 million outstanding at one time for preliminary, acquisition, and construction costs and contemplated public-power revenue bonds. Fitch reported that a recent upgrade of Collierville units 1 and 2 was financed with approximately $12.4 million of private-placement debt. No plant sale price or portfolio transaction value is disclosed. — Fitch Affirms Northern California Power Agency, CA's Various Project Rev Bonds; Outlook Stable · confidence: medium
- Financing summary: NCPA project agreements provided for construction, operation, and financing of the North Fork Stanislaus development, with project participants purchasing rights to the project's capacity and energy. An NCPA project ordinance authorized temporary notes of up to $500 million outstanding at one time for preliminary, acquisition, and construction costs and contemplated public-power revenue bonds. Fitch reported that a recent upgrade of Collierville units 1 and 2 was financed with approximately $12.4 million of private-placement debt. No plant sale price or portfolio transaction value is disclosed. — The Calaveras County Water District has signed a contract... - UPI Archives · confidence: medium
- Timeline: [{"event":"FERC license issued","date":"1982-02-08","detail":"The Federal Power Commission, FERC's predecessor, issued the North Fork Stanislaus River Hydroelectric Project license, FERC P-2409, to Calaveras County Water District."},{"event":"Construction, operation, and financing agreement","date":"1982-09","detail":"NCPA and participating entities entered the North Fork Stanislaus construction, operation, and financing agreement. The related participant structure provided for the purchase of project capacity and energy rights rather than a documented sale of the physical powerhouse."},{"event":"Construction contract","date":"1985-04-02","detail":"CCWD 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."},{"event":"Commercial operation","date":"1989-11-01","detail":"Collierville Powerhouse entered operation in November 1989; the plant record identifies November 1, 1989, and reports two generating units totaling 253 MW."},{"event":"Partial transmission-line license transfer","date":"1992-02-12","detail":"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."},{"event":"Turbine upgrade","date":"2014-05","detail":"Fitch's May 2014 credit report described a recent upgrade of units 1 and 2, financed with approximately $12.4 million of private-placement debt."}] — ANNOTATED LICENSE - CURRENT FERC LICENSE REQUIREMENTS · confidence: medium
- Timeline: [{"event":"FERC license issued","date":"1982-02-08","detail":"The Federal Power Commission, FERC's predecessor, issued the North Fork Stanislaus River Hydroelectric Project license, FERC P-2409, to Calaveras County Water District."},{"event":"Construction, operation, and financing agreement","date":"1982-09","detail":"NCPA and participating entities entered the North Fork Stanislaus construction, operation, and financing agreement. The related participant structure provided for the purchase of project capacity and energy rights rather than a documented sale of the physical powerhouse."},{"event":"Construction contract","date":"1985-04-02","detail":"CCWD 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."},{"event":"Commercial operation","date":"1989-11-01","detail":"Collierville Powerhouse entered operation in November 1989; the plant record identifies November 1, 1989, and reports two generating units totaling 253 MW."},{"event":"Partial transmission-line license transfer","date":"1992-02-12","detail":"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."},{"event":"Turbine upgrade","date":"2014-05","detail":"Fitch's May 2014 credit report described a recent upgrade of units 1 and 2, financed with approximately $12.4 million of private-placement debt."}] — Agenda Report - September 21, 1983 (42) · confidence: medium
- Timeline: [{"event":"FERC license issued","date":"1982-02-08","detail":"The Federal Power Commission, FERC's predecessor, issued the North Fork Stanislaus River Hydroelectric Project license, FERC P-2409, to Calaveras County Water District."},{"event":"Construction, operation, and financing agreement","date":"1982-09","detail":"NCPA and participating entities entered the North Fork Stanislaus construction, operation, and financing agreement. The related participant structure provided for the purchase of project capacity and energy rights rather than a documented sale of the physical powerhouse."},{"event":"Construction contract","date":"1985-04-02","detail":"CCWD 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."},{"event":"Commercial operation","date":"1989-11-01","detail":"Collierville Powerhouse entered operation in November 1989; the plant record identifies November 1, 1989, and reports two generating units totaling 253 MW."},{"event":"Partial transmission-line license transfer","date":"1992-02-12","detail":"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."},{"event":"Turbine upgrade","date":"2014-05","detail":"Fitch's May 2014 credit report described a recent upgrade of units 1 and 2, financed with approximately $12.4 million of private-placement debt."}] — The Calaveras County Water District has signed a contract... - UPI Archives · confidence: medium
- Timeline: [{"event":"FERC license issued","date":"1982-02-08","detail":"The Federal Power Commission, FERC's predecessor, issued the North Fork Stanislaus River Hydroelectric Project license, FERC P-2409, to Calaveras County Water District."},{"event":"Construction, operation, and financing agreement","date":"1982-09","detail":"NCPA and participating entities entered the North Fork Stanislaus construction, operation, and financing agreement. The related participant structure provided for the purchase of project capacity and energy rights rather than a documented sale of the physical powerhouse."},{"event":"Construction contract","date":"1985-04-02","detail":"CCWD 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."},{"event":"Commercial operation","date":"1989-11-01","detail":"Collierville Powerhouse entered operation in November 1989; the plant record identifies November 1, 1989, and reports two generating units totaling 253 MW."},{"event":"Partial transmission-line license transfer","date":"1992-02-12","detail":"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."},{"event":"Turbine upgrade","date":"2014-05","detail":"Fitch's May 2014 credit report described a recent upgrade of units 1 and 2, financed with approximately $12.4 million of private-placement debt."}] — Fitch Affirms Northern California Power Agency, CA's Various Project Rev Bonds; Outlook Stable · confidence: medium
- Commercial parties.0: {"relationship":"Owner and FERC licensee","name":"Calaveras County Water District","detail":"CCWD received the FERC P-2409 license in February 1982 and owns the powerhouse/project facilities.","official_url":"https://www.ccwd.org/"} — Source · confidence: medium
- Commercial parties.1: {"relationship":"Joint developer and project operator","name":"Northern California Power Agency","detail":"NCPA jointly developed the North Fork Stanislaus project, operates the hydroelectric project, receives its power under project agreements, and owns/operates the associated Collierville-Bellota transmission facilities.","official_url":"https://www.ncpa.com/"} — Source · confidence: medium
- Commercial parties.1: {"relationship":"Joint developer and project operator","name":"Northern California Power Agency","detail":"NCPA jointly developed the North Fork Stanislaus project, operates the hydroelectric project, receives its power under project agreements, and owns/operates the associated Collierville-Bellota transmission facilities.","official_url":"https://www.ncpa.com/"} — Agenda Report - September 21, 1983 (42) · confidence: medium
- Commercial parties.2: {"relationship":"Construction contractor","name":"Sierra Constructors","detail":"Sierra Constructors was identified in 1985 as the joint venture of Guy F. Atkinson Co. of California and Harrison Western Construction responsible for building the development.","official_url":null} — The Calaveras County Water District has signed a contract... - UPI Archives · confidence: medium
- Quality notes.0: EIA plant capacity is 253 MW, while CCWD's P-2409 relicensing materials report 256.8 MW for the broader project; these figures should not be treated as interchangeable. — Source · confidence: medium
- Quality notes.1: FERC's February 1992 partial transfer concerned the Collierville and Spicer Meadows transmission lines transferred to NCPA, not a sale or transfer of the Collierville powerhouse itself. — P-2409 Relicense Homepage - Calaveras County Water District · confidence: medium
- Quality notes.2: The approximately $267 million figure is reported as the construction-project value, not as sale consideration or confirmed bond principal. — ANNOTATED LICENSE - CURRENT FERC... · confidence: medium
- Quality notes.2: The approximately $267 million figure is reported as the construction-project value, not as sale consideration or confirmed bond principal. — The Calaveras County Water District has signed a contract... - UPI Archives · confidence: medium
- Quality notes.2: The approximately $267 million figure is reported as the construction-project value, not as sale consideration or confirmed bond principal. — Source · confidence: medium
- Timeline.0: {"event":"FERC license issued","date":"1982-02-08","detail":"The Federal Power Commission, FERC's predecessor, issued the North Fork Stanislaus River Hydroelectric Project license, FERC P-2409, to Calaveras County Water District."} — Source · confidence: medium
- Timeline.1: {"event":"Construction, operation, and financing agreement","date":"1982-09","detail":"NCPA and participating entities entered the North Fork Stanislaus construction, operation, and financing agreement. The related participant structure provided for the purchase of project capacity and energy rights rather than a documented sale of the physical powerhouse."} — Agenda Report - September 21, 1983 (42) · confidence: medium
- Timeline.2: {"event":"Construction contract","date":"1985-04-02","detail":"CCWD 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."} — The Calaveras County Water District has signed a contract... - UPI Archives · confidence: medium
- Timeline.4: {"event":"Partial transmission-line license transfer","date":"1992-02-12","detail":"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."} — ANNOTATED LICENSE - CURRENT FERC... · confidence: medium
- Timeline.5: {"event":"Turbine upgrade","date":"2014-05","detail":"Fitch's May 2014 credit report described a recent upgrade of units 1 and 2, financed with approximately $12.4 million of private-placement debt."} — Fitch Affirms Northern California Power Agency, CA's Various Project Rev Bonds; Outlook Stable · confidence: medium

## Timeline

- 1982-02-08 — FERC license issued
  The Federal Power Commission, FERC's predecessor, issued the North Fork Stanislaus River Hydroelectric Project license, FERC P-2409, to Calaveras County Water District.
  Source: ANNOTATED LICENSE - CURRENT FERC LICENSE REQUIREMENTS (https://www.ccwd.org/files/efbd97e3d/P-2409_Annotated%2BLicense_November%2B2025.pdf)
- 1985-04-02 — Construction contract
  CCWD 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.
  Source: The Calaveras County Water District has signed a contract... - UPI Archives (https://www.upi.com/Archives/1985/04/02/The-Calaveras-County-Water-District-has-signed-a-contract/6297481266000/)
- 1992-02-12 — Partial transmission-line license transfer
  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.
  Source: ANNOTATED LICENSE - CURRENT FERC LICENSE REQUIREMENTS (https://www.ccwd.org/files/efbd97e3d/P-2409_Annotated%2BLicense_November%2B2025.pdf)

## Sources

- [case studies for the Collierville Powerhouse sump](https://www.waterboards.ca.gov/water_issues/programs/npdes/docs/utilityvaults/ncpa_case_studies_collierville_powerhouse_sump.pdf) — waterboards.ca.gov · tier regulatory
- [Homepage Calaveras County Water District](https://www.ccwd.org/) — ccwd.org · tier other
- [2026 NQC List](https://www.caiso.com/documents/net-qualifying-capacity-report-for-compliance-year-2026.xlsx) — caiso.com · tier other
- [Hydroelectric | NCPA](https://www.ncpa.com/about/generation/hydroelectric/) — ncpa.com · tier other
- [ANNOTATED LICENSE - CURRENT FERC ...](https://www.ccwd.org/files/efbd97e3d/P-2409_Annotated+License_November+2025.pdf) — ccwd.org · tier other
- [Collierville Powerhouse, US](https://www.power-technology.com/marketdata/collierville-powerhouse-us/) — power-technology.com · tier other
- [Hydro service and rehabilitation in the USA](https://www.andritz.com/hydro-en/about-andritz-hydro/locations/charlotte-usa/usa-service-and-rehabilitation) — andritz.com · tier other
- [Turbines](https://www.andritz.com/products-en/hydro/products/turbines-hydropower) — andritz.com · tier other
- [Source](https://ccwd.org/files/8d7aca11c/Agenda%2BPackage.pdf) — ccwd.org · tier other
- [Source](https://ncpa.com/about/generation/hydroelectric) — ncpa.com · tier other
- [Source](https://waterboards.ca.gov/water_issues/programs/npdes/docs/utilityvaults/ncpa_case_studies_collierville_powerhouse_sump.pdf) — waterboards.ca.gov · tier regulatory
- [The Calaveras County Water District has signed a contract... - UPI Archives](https://www.upi.com/Archives/1985/04/02/The-Calaveras-County-Water-District-has-signed-a-contract/6297481266000/) — upi.com · tier other
- [P-2409 Relicense Homepage - Calaveras County Water District](https://www.ccwd.org/p-2409-relicense-homepage) — ccwd.org · tier other
- [Source](https://records.lodi.gov/WebLink/DocView.aspx?id=20832&dbid=0&repo=CITY-RECORDS) — records.lodi.gov · tier regulatory
- [Agenda Report - September 21, 1983 (42)](https://records.lodi.gov/WebLink/DocView.aspx?id=20481&dbid=0&repo=CITY-RECORDS) — records.lodi.gov · tier regulatory
- [Fitch Affirms Northern California Power Agency, CA's Various Project Rev Bonds; Outlook Stable](https://www.fitchratings.com/research/us-public-finance/fitch-affirms-northern-california-power-agency-ca-various-project-rev-bonds-outlook-stable-13-05-2014) — fitchratings.com · tier other
- [ANNOTATED LICENSE - CURRENT FERC LICENSE REQUIREMENTS](https://www.ccwd.org/files/efbd97e3d/P-2409_Annotated%2BLicense_November%2B2025.pdf) — ccwd.org · tier other
- [Agenda Item 17 M9/97](https://www.waterboards.ca.gov/board_info/agendas/1997/september/0918-17.htm) — waterboards.ca.gov · tier regulatory
- [Source](https://caiso.com/documents/net-qualifying-capacity-report-for-compliance-year-2026.xlsx) — caiso.com · tier other
- [Source](https://caiso.com/notices/announced-resource-retirement-and-mothball-list-posted-4) — caiso.com · tier other

## Data quality

- EIA plant capacity is 253 MW, while CCWD's P-2409 relicensing materials report 256.8 MW for the broader project; these figures should not be treated as interchangeable. FERC's February 1992 partial transfer concerned the Collierville and Spicer Meadows transmission lines transferred to NCPA, not a sale or transfer of the Collierville powerhouse itself. The approximately $267 million figure is reported as the construction-project value, not as sale consideration or confirmed bond principal.

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