# Pastoria Energy Facility, LLC

CAISO Natural Gas Fired Combined Cycle · https://askthegrid.com/assets/facilities/pastoria-energy-facility-llc

Pastoria Energy Facility, LLC is a natural gas-fired power facility with 779 MW of EIA-reported nameplate capacity in Kern County, California, registered as EIA Plant ID 55656. Calpine Corporation owns and operates the plant. Pastoria is a large CAISO natural-gas combined-cycle facility in Kern County: the EIA record reports 779 MW of nameplate capacity across five generating units, while the California Energy Commission describes the certified project as nominally 750 MW. Commercial operation began on July 5, 2005.

## Key facts

- Technology: Natural Gas Fired Combined Cycle
- Power capacity: 779 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CISO (CAISO)
- Substation: Pastoria Substation
- Point of interconnection: Pastoria Substation
- Transmission owner: Southern California Edison
- Interconnection voltage: 230 kV

## Source-backed facts

- Owner logo domain: calpine.com — Calpine: America's Premier Competitive Power Company · confidence: high
- Identifiers: [{"value":"55656","system":"EIA plant ID"},{"value":"CISO","system":"Balancing authority"},{"value":"CAISO","system":"ISO/RTO power market"},{"value":"Pastoria1","system":"CAISO NQC/resource identifier"},{"value":"Pastoria Energy Facility, L.L.C. — LGIA","system":"CAISO interconnection agreement"},{"value":"99-AFC-07","system":"California Energy Commission docket"},{"value":"99-AFC-07C","system":"California Energy Commission compliance docket"},{"value":"CT01, CT02, CT04, ST03, ST05","system":"EIA generator IDs"},{"value":"SP-15","system":"CAISO LMP node"}] — Turning Down the Gas in California · confidence: medium
- Identifiers: [{"value":"55656","system":"EIA plant ID"},{"value":"CISO","system":"Balancing authority"},{"value":"CAISO","system":"ISO/RTO power market"},{"value":"Pastoria1","system":"CAISO NQC/resource identifier"},{"value":"Pastoria Energy Facility, L.L.C. — LGIA","system":"CAISO interconnection agreement"},{"value":"99-AFC-07","system":"California Energy Commission docket"},{"value":"99-AFC-07C","system":"California Energy Commission compliance docket"},{"value":"CT01, CT02, CT04, ST03, ST05","system":"EIA generator IDs"},{"value":"SP-15","system":"CAISO LMP node"}] — California Energy Commission : Docket Log · confidence: medium
- Identifiers.3: {"value":"Pastoria1","system":"CAISO NQC/resource identifier"} — Turning Down the Gas in California · confidence: medium
- Identifiers.6: {"value":"99-AFC-07C","system":"California Energy Commission compliance docket"} — California Energy Commission : Docket Log · confidence: high
- Parties.2: {"relationship":"Developer","name":"Calpine Corporation","official_url":"https://www.calpine.com/"} — Calpine breaks ground on 750-MW Pastoria Energy Center in California · confidence: high
- Parties.4: {"relationship":"EPC contractor","name":"Kvaerner Construction","official_url":null} — Power plant profile: Pastoria Energy Facility, US · confidence: medium
- Parties.5: {"relationship":"Turbine OEM","name":"General Electric / GE Energy","official_url":null} — Calpine breaks ground on 750-MW Pastoria Energy Center in California · confidence: medium
- Parties.6: {"relationship":"Generator supplier","name":"GE Power","official_url":null} — Power plant profile: Pastoria Energy Facility, US · confidence: medium
- Parties.7: {"relationship":"Interconnecting utility","name":"Southern California Edison","official_url":"https://www.sce.com/"} — Pastoria Energy Facility | California Energy Commission · confidence: high
- Parties.8: {"relationship":"Land lessor","name":"Tejon Ranch Corporation","official_url":"https://www.tejonranch.com/"} — Calpine breaks ground on 750-MW Pastoria Energy Center in California · confidence: medium
- Parties.10: {"relationship":"Former owner at certification","name":"Enron North America Corporation","official_url":null} — Pastoria Energy Facility | California Energy Commission · confidence: high
- Product url: https://www.gevernova.com/gas-power/products/gas-turbines/7f — 7F Heavy Duty Gas Turbine | 7F.04/7F.05 | GE Vernova · confidence: medium
- Equipment models.3: {"manufacturer_domain":"cicgroup.com","product_url":"https://www.cicgroup.com/nooter-eriksen/","count":3,"unit_mw":null,"name":"Nooter/Eriksen heat-recovery steam generator / steam boiler"} — Nooter/Eriksen – Sustainable Energy Management · confidence: medium
- Quality notes: ["Capacity is reported on different bases: the CEC lists the certified facility at nominally 750 MW, whereas the EIA plant record reports 779 MW of nameplate capacity, 757 MW summer capacity, and 799 MW winter capacity.","A 2006 simple-cycle expansion was approved but never built; its license expired on December 18, 2011, so it should not be counted as an addition to the operating plant.","The 2012 Advanced Gas Path amendment involved component replacements on two existing combustion turbines, and the 2013 amendment added a second brine crystallizer; the cited CEC record does not describe either action as construction of a new generating unit.","The reviewed SEC filing identifies Pastoria as a $500 million planned project and discusses portfolio-level construction financing, but does not disclose a Pastoria-specific financing draw or acquisition price. The approximately $7.8 million figure in the same filing relates to WRMS Engineering, not Pastoria."] — Source · confidence: medium
- Commercial parties.3: {"relationship":"Former owner and seller of development rights","name":"Enron North America Corporation","detail":"Former project owner at certification and seller of the Pastoria development rights acquired by Calpine on April 11, 2001.","official_url":null} — Source · confidence: high
- Commercial parties.4: {"relationship":"Former corporate owner of Calpine","name":"Energy Capital Partners","detail":"Led the consortium that acquired Calpine in March 2018 and later sold Calpine to Constellation.","official_url":"https://www.ecpgp.com/"} — Consortium Led by Energy Capital Partners Completes Acquisition of Calpine Corporation; Announces Management Roles and Board of Directors | Energy Capital Partners I ECP · confidence: medium
- Commercial parties.4: {"relationship":"Former corporate owner of Calpine","name":"Energy Capital Partners","detail":"Led the consortium that acquired Calpine in March 2018 and later sold Calpine to Constellation.","official_url":"https://www.ecpgp.com/"} — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Commercial parties.5: {"relationship":"EPC contractor","name":"Kvaerner Construction","detail":"Selected to provide project management, supplementary engineering, procurement, and full construction services for the Pastoria project.","official_url":null} — Kvaerner secures US$190 million construction contract – E24 · confidence: medium
- Commercial parties.6: {"relationship":"Turbine OEM","name":"General Electric / GE Energy","detail":"The project design specified three GE Energy 7FA gas turbines in combined-cycle configuration.","official_url":"https://www.ge.com/"} — Source · confidence: high
- Commercial parties.6: {"relationship":"Turbine OEM","name":"General Electric / GE Energy","detail":"The project design specified three GE Energy 7FA gas turbines in combined-cycle configuration.","official_url":"https://www.ge.com/"} — Source · confidence: high
- Commercial parties.7: {"relationship":"Interconnecting utility","name":"Southern California Edison","detail":"Pastoria interconnects through a 1.38-mile, 230-kV overhead transmission line to Southern California Edison’s Pastoria Substation.","official_url":"https://www.sce.com/"} — Source · confidence: high
- Commercial parties.8: {"relationship":"Land lessor","name":"Tejon Ranch Corporation","detail":"The project site was located on property leased from Tejon Ranch Corporation.","official_url":"https://www.tejonranch.com/"} — Source · confidence: high
- Timeline.1: {"event":"Development-rights acquisition","date":"2001-04-11","detail":"Calpine acquired the development rights for the planned Pastoria Energy Center from Enron North America. The cited SEC filing does not state the purchase consideration."} — Source · confidence: high
- Timeline.3: {"event":"Construction start","date":"2001-06","detail":"Calpine reported that construction would begin in June 2001; a contemporaneous announcement later stated that construction was under way."} — Source · confidence: medium
- Timeline.4: {"event":"EPC contract and construction","date":"2001-08","detail":"Kvaerner Construction was selected to provide project management, engineering, procurement, and full construction services for the 750-MW facility; Calpine announced construction was under way on August 23, 2001."} — Source · confidence: medium
- Timeline.4: {"event":"EPC contract and construction","date":"2001-08","detail":"Kvaerner Construction was selected to provide project management, engineering, procurement, and full construction services for the 750-MW facility; Calpine announced construction was under way on August 23, 2001."} — Kvaerner secures US$190 million construction contract – E24 · confidence: medium
- Timeline.5: {"event":"Emissions-control amendment","date":"2002-01-11","detail":"The CEC approved conversion from aqueous to anhydrous ammonia for emissions control."} — Pastoria Energy Facility | California Energy Commission · confidence: medium
- Timeline.7: {"event":"Unbuilt expansion approved","date":"2006-11-08","detail":"The CEC approved the Pastoria Energy Facility Expansion Project, a simple-cycle addition, but the project was never built."} — Pastoria Energy Facility | California Energy Commission · confidence: high
- Timeline.8: {"event":"Expansion license expiration","date":"2011-12-18","detail":"The license for the unbuilt simple-cycle expansion expired."} — Pastoria Energy Facility | California Energy Commission · confidence: high
- Timeline.9: {"event":"Advanced Gas Path modification","date":"2012-02-24","detail":"The CEC approved replacement of selected Advanced Gas Path components on two of the three existing combustion turbines to support higher firing temperatures."} — Pastoria Energy Facility | California Energy Commission · confidence: high
- Timeline.10: {"event":"Water-treatment modification","date":"2013-12-30","detail":"The CEC approved installation of a second brine crystallizer in the facility’s Zero Liquid Discharge system."} — Pastoria Energy Facility | California Energy Commission · confidence: high
- Timeline.11: {"event":"Calpine corporate acquisition","date":"2018-03-08","detail":"An Energy Capital Partners-led consortium completed its acquisition of Calpine. This was a corporate transaction involving Calpine and its portfolio, not a separately reported Pastoria asset sale."} — Consortium Led by Energy Capital Partners Completes Acquisition of Calpine Corporation; Announces Management Roles and Board of Directors | Energy Capital Partners I ECP · confidence: high
- Timeline.12: {"event":"Constellation corporate acquisition","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the ultimate parent of Calpine’s operating portfolio, including Pastoria."} — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Quality notes.1: A 2006 simple-cycle expansion was approved but never built; its license expired on December 18, 2011, so it should not be counted as an addition to the operating plant. — Pastoria Energy Facility | California Energy Commission · confidence: high
- Quality notes.2: The 2012 Advanced Gas Path amendment involved component replacements on two existing combustion turbines, and the 2013 amendment added a second brine crystallizer; the cited CEC record does not describe either action as construction of a new generating unit. — Pastoria Energy Facility | California Energy Commission · confidence: medium
- Quality notes.3: The reviewed SEC filing identifies Pastoria as a $500 million planned project and discusses portfolio-level construction financing, but does not disclose a Pastoria-specific financing draw or acquisition price. The approximately $7.8 million figure in the same filing relates to WRMS Engineering, not Pastoria. — Source · confidence: medium
- Status detail: Pastoria Energy Facility is operating as a natural-gas combined-cycle plant. Calpine's February 6, 2026 operating-plant table lists it as a 780-MW WECC/California combined-cycle facility, while the CEC lists the project as operational. The separate solar, battery, and existing gas facilities are described as distinct components; the facility also has an associated SCE-area Pastoria Energy Facility Remedial Action Scheme. — Source · confidence: high
- Grid role: Reliability-supporting combined-cycle generation associated with the existing SCE-area Pastoria Energy Facility Remedial Action Scheme (PEF RAS). — Source · confidence: medium

## Timeline

- 2000-12-20 — CEC certification
  The California Energy Commission certified the nominally 750-MW natural-gas-fired combined-cycle Pastoria project under docket 99-AFC-07.
  Source: Pastoria Energy Facility | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility)
- 2002-01-11 — Emissions-control amendment
  The CEC approved conversion from aqueous to anhydrous ammonia for emissions control.
  Source: Pastoria Energy Facility | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility)
- 2005-07-05 — Commercial operation
  The CEC records the start of commercial operation for the Pastoria Energy Facility.
  Source: Pastoria Energy Facility | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility)
- 2006-11-08 — Unbuilt expansion approved
  The CEC approved the Pastoria Energy Facility Expansion Project, a simple-cycle addition, but the project was never built.
  Source: Pastoria Energy Facility | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility)
- 2011-12-18 — Expansion license expiration
  The license for the unbuilt simple-cycle expansion expired.
  Source: Pastoria Energy Facility | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility)
- 2012-02-24 — Advanced Gas Path modification
  The CEC approved replacement of selected Advanced Gas Path components on two of the three existing combustion turbines to support higher firing temperatures.
  Source: Pastoria Energy Facility | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility)
- 2013-12-30 — Water-treatment modification
  The CEC approved installation of a second brine crystallizer in the facility’s Zero Liquid Discharge system.
  Source: Pastoria Energy Facility | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility)

## Sources

- [Calpine: America's Premier Competitive Power Company](https://www.calpine.com/) — calpine.com · tier other
- [Turning Down the Gas in California](https://www.ucs.org/sites/default/files/attach/2018/08/Turn-Down-Technical-Appendix.pdf) — ucs.org · tier other
- [Pastoria Energy Facility | California Energy Commission](https://www.energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility) — energy.ca.gov · tier regulatory
- [California Energy Commission : Docket Log](https://efiling.energy.ca.gov/Lists/DocketLog.aspx?docketnumber=99-AFC-07C) — efiling.energy.ca.gov · tier regulatory
- [Calpine breaks ground on 750-MW Pastoria Energy Center in California](https://www.power-eng.com/operations-maintenance/calpine-breaks-ground-on-750-mw-pastoria-energy-center-in-california/) — power-eng.com · tier other
- [Power plant profile: Pastoria Energy Facility, US](https://www.power-technology.com/data-insights/power-plant-profile-pastoria-energy-facility-us/) — power-technology.com · tier other
- [Source](https://power-eng.com/operations-maintenance/calpine-breaks-ground-on-750-mw-pastoria-energy-center-in-california) — power-eng.com · tier other
- [7F Heavy Duty Gas Turbine | 7F.04/7F.05 | GE Vernova](https://www.gevernova.com/gas-power/products/gas-turbines/7f) — gevernova.com · tier other
- [Nooter/Eriksen – Sustainable Energy Management](https://cicgroup.com/nooter-eriksen/) — cicgroup.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/916457/000089161801501784/f75423e8-k.htm) — sec.gov · tier regulatory
- [Source](https://energy.ca.gov/powerplant/combined-cycle/pastoria-energy-facility) — energy.ca.gov · tier regulatory
- [Constellation Completes Calpine Transaction, Powering America's Clean Energy Future](https://www.constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html) — constellationenergy.com · tier other
- [Kvaerner secures US$190 million construction contract – E24](https://e24.no/energi-og-klima/i/EWAK22/kvaerner-secures-us-190-million-construction-contract) — e24.no · tier other
- [Consortium Led by Energy Capital Partners Completes Acquisition of Calpine Corporation; Announces Management Roles and Board of Directors | Energy Capital Partners I ECP](https://www.ecpgp.com/about/news-and-insights/press-releases/2018/consortium-led-by-energy-capital-partners-completes-acquisition-of-calpine-corporation-announces-management-roles-and-board-of-directors) — ecpgp.com · tier other
- [Source](https://constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html) — constellationenergy.com · tier other
- [Announced Resource Retirement and Mothball List posted | California ISO](https://www.caiso.com/notices/announced-resource-retirement-and-mothball-list-posted-4) — caiso.com · tier other
- [Table of Operating Power Plants and Projects Under Construction as of: Friday, February 6, 2026](https://www.calpine.com/wp-content/uploads/2026/02/CPN-PORT-1_Q12026.pdf) — calpine.com · tier other
- [Source](https://www.caiso.com/documents/appendix-a-system-data-revised-draft-2025-2026-transmission-plan-may-2026.pdf) — caiso.com · tier other

## Data quality

- Capacity is reported on different bases: the CEC lists the certified facility at nominally 750 MW, whereas the EIA plant record reports 779 MW of nameplate capacity, 757 MW summer capacity, and 799 MW winter capacity. A 2006 simple-cycle expansion was approved but never built; its license expired on December 18, 2011, so it should not be counted as an addition to the operating plant. The 2012 Advanced Gas Path amendment involved component replacements on two existing combustion turbines, and the 2013 amendment added a second brine crystallizer; the cited CEC record does not describe either action as construction of a new generating unit. The reviewed SEC filing identifies Pastoria as a $500 million planned project and discusses portfolio-level construction financing, but does not disclose a Pastoria-specific financing draw or acquisition price. The approximately $7.8 million figure in the same filing relates to WRMS Engineering, not Pastoria.

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