# Otay Mesa Generating Project

CAISO Natural Gas Fired Combined Cycle · https://askthegrid.com/assets/facilities/otay-mesa-generating-project

Otay Mesa Generating Project is a natural gas-fired power facility with 710.7 MW of EIA-reported nameplate capacity in San Diego County, California, registered as EIA Plant ID 55345. Otay Mesa Energy Center LLC is the registered plant entity or operator. Calpine Corporation acquired the project from PG&E National Energy Group in 2001.

## Key facts

- Technology: Natural Gas Fired Combined Cycle
- Power capacity: 710.7 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CAISO
- Substation: Otay Mesa Substation
- Point of interconnection: Otay Mesa Substation
- Transmission owner: San Diego Gas & Electric (SDG&E)
- Interconnection voltage: 230 kV

## Source-backed facts

- Owner logo domain: calpine.com — Calpine: America's Premier Competitive Power Company · confidence: medium
- Identifiers: [{"value":"55345","system":"EIA plant code"},{"value":"14274","system":"EIA utility ID"},{"value":"OM1CT1","system":"EIA generator ID"},{"value":"OM1CT2","system":"EIA generator ID"},{"value":"OM1ST1","system":"EIA generator ID"},{"value":"1-01","system":"EIA unit code"},{"value":"OTMESA_2_PL1X3","system":"CAISO resource ID"},{"value":"22605","system":"CAISO local-capacity report resource number"},{"value":"OTAYMGT1","system":"CAISO modeled physical resource"},{"value":"99-AFC-05","system":"California Energy Commission docket"},{"value":"A.04-03-008","system":"California Public Utilities Commission docket"},{"value":"G0785","system":"California air-regulatory facility ID"},{"value":"101746","system":"EPA/ORIS facility ID"}] — Schedule 6A, 'Boiler / Generator Associations' · confidence: medium
- Identifiers: [{"value":"55345","system":"EIA plant code"},{"value":"14274","system":"EIA utility ID"},{"value":"OM1CT1","system":"EIA generator ID"},{"value":"OM1CT2","system":"EIA generator ID"},{"value":"OM1ST1","system":"EIA generator ID"},{"value":"1-01","system":"EIA unit code"},{"value":"OTMESA_2_PL1X3","system":"CAISO resource ID"},{"value":"22605","system":"CAISO local-capacity report resource number"},{"value":"OTAYMGT1","system":"CAISO modeled physical resource"},{"value":"99-AFC-05","system":"California Energy Commission docket"},{"value":"A.04-03-008","system":"California Public Utilities Commission docket"},{"value":"G0785","system":"California air-regulatory facility ID"},{"value":"101746","system":"EPA/ORIS facility ID"}] — qfer eia caiso · confidence: medium
- Identifiers: [{"value":"55345","system":"EIA plant code"},{"value":"14274","system":"EIA utility ID"},{"value":"OM1CT1","system":"EIA generator ID"},{"value":"OM1CT2","system":"EIA generator ID"},{"value":"OM1ST1","system":"EIA generator ID"},{"value":"1-01","system":"EIA unit code"},{"value":"OTMESA_2_PL1X3","system":"CAISO resource ID"},{"value":"22605","system":"CAISO local-capacity report resource number"},{"value":"OTAYMGT1","system":"CAISO modeled physical resource"},{"value":"99-AFC-05","system":"California Energy Commission docket"},{"value":"A.04-03-008","system":"California Public Utilities Commission docket"},{"value":"G0785","system":"California air-regulatory facility ID"},{"value":"101746","system":"EPA/ORIS facility ID"}] — Draft 2027 Local Capacity Technical Report · confidence: medium
- Identifiers: [{"value":"55345","system":"EIA plant code"},{"value":"14274","system":"EIA utility ID"},{"value":"OM1CT1","system":"EIA generator ID"},{"value":"OM1CT2","system":"EIA generator ID"},{"value":"OM1ST1","system":"EIA generator ID"},{"value":"1-01","system":"EIA unit code"},{"value":"OTMESA_2_PL1X3","system":"CAISO resource ID"},{"value":"22605","system":"CAISO local-capacity report resource number"},{"value":"OTAYMGT1","system":"CAISO modeled physical resource"},{"value":"99-AFC-05","system":"California Energy Commission docket"},{"value":"A.04-03-008","system":"California Public Utilities Commission docket"},{"value":"G0785","system":"California air-regulatory facility ID"},{"value":"101746","system":"EPA/ORIS facility ID"}] — Otay Mesa Energy Center | California Energy Commission · confidence: medium
- Identifiers: [{"value":"55345","system":"EIA plant code"},{"value":"14274","system":"EIA utility ID"},{"value":"OM1CT1","system":"EIA generator ID"},{"value":"OM1CT2","system":"EIA generator ID"},{"value":"OM1ST1","system":"EIA generator ID"},{"value":"1-01","system":"EIA unit code"},{"value":"OTMESA_2_PL1X3","system":"CAISO resource ID"},{"value":"22605","system":"CAISO local-capacity report resource number"},{"value":"OTAYMGT1","system":"CAISO modeled physical resource"},{"value":"99-AFC-05","system":"California Energy Commission docket"},{"value":"A.04-03-008","system":"California Public Utilities Commission docket"},{"value":"G0785","system":"California air-regulatory facility ID"},{"value":"101746","system":"EPA/ORIS facility ID"}] — Forms S-1 · confidence: medium
- Official project url: https://www.energy.ca.gov/powerplant/combined-cycle/otay-mesa-energy-center — Otay Mesa Energy Center | California Energy Commission · confidence: high
- Description: Otay Mesa Generating Project is an operating natural-gas-fired combined-cycle power plant in San Diego County, California. The plant has three operating generators totaling 710.7 MW and began commercial operation in 2009. The California Energy Commission identifies the facility as Otay Mesa Energy Center and lists CEC docket 99-AFC-05. — Otay Mesa Energy Center | California Energy Commission · confidence: medium
- Canonical name: Otay Mesa Generating Project — Otay Mesa Energy Center | California Energy Commission · confidence: high
- Identifiers.1: {"value":"14274","system":"EIA utility ID"} — Schedule 6A, 'Boiler / Generator Associations' · confidence: medium
- Identifiers.4: {"value":"OM1ST1","system":"EIA generator ID"} — qfer eia caiso · confidence: high
- Identifiers.5: {"value":"1-01","system":"EIA unit code"} — Draft 2027 Local Capacity Technical Report · confidence: medium
- Identifiers.6: {"value":"OTMESA_2_PL1X3","system":"CAISO resource ID"} — Draft 2027 Local Capacity Technical Report · confidence: medium
- Identifiers.7: {"value":"22605","system":"CAISO local-capacity report resource number"} — Otay Mesa Energy Center | California Energy Commission · confidence: high
- Identifiers.8: {"value":"OTAYMGT1","system":"CAISO modeled physical resource"} — Forms S-1 · confidence: medium
- Identifiers.10: {"value":"A.04-03-008","system":"California Public Utilities Commission docket"} — Otay Mesa Energy Center | California Energy Commission · confidence: high
- Identifiers.10: {"value":"A.04-03-008","system":"California Public Utilities Commission docket"} — Library | A.04-03-008 Otay Mesa power purchase agreement transmission project | California ISO · confidence: high
- Parties.1: {"relationship":"Parent company","name":"Calpine Corporation","official_url":"https://www.calpine.com/"} — Calpine: America's Premier Competitive Power Company · confidence: high
- Parties.7: {"relationship":"HRSG/steam-boiler supplier","name":"Nooter/Eriksen","official_url":null} — Power plant profile: Otay Mesa Energy Center, US · confidence: high
- Parties.9: {"relationship":"Certifying regulator","name":"California Energy Commission","official_url":"https://www.energy.ca.gov/"} — Otay Mesa Energy Center | California Energy Commission · confidence: high
- Construction scope: The facility comprises two power stations. Each has one 171.7 MW nominal General Electric 7FA natural-gas combustion turbine with DLN 2.6 burners and one Nooter-Eriksen HRSG with a 388.1 MMBtu/hr duct burner. Common equipment includes one 277 MW nominal Siemens-Westinghouse Model KN steam-turbine generator, two GEA air-cooled condensers, and one Niagara Blower Co. Model RWC 48240-2F16 wet-surface air cooler. The turbines are equipped with GE OpFlex control software. — Source · confidence: high
- Product url: https://www.gevernova.com/gas-power/products/gas-turbines/7f — Source · confidence: medium
- Product url: https://www.gevernova.com/gas-power/products/gas-turbines/7f — 7F Heavy Duty Gas Turbine | 7F.04/7F.05 · confidence: medium
- Kind: thermal — Source · confidence: high
- Manufacturer domain: gevernova.com — Source · confidence: high
- Manufacturer domain: gevernova.com — 7F Heavy Duty Gas Turbine | 7F.04/7F.05 · confidence: high
- Equipment models: [{"manufacturer_domain":"gevernova.com","product_url":"https://www.gevernova.com/gas-power/products/gas-turbines/7f","count":2,"unit_mw":171.7,"name":"General Electric 7FA gas turbine"},{"manufacturer_domain":"siemens-energy.com","product_url":"https://www.siemens-energy.com/global/en/home/products-services/product-offerings/steam-turbines.html","count":1,"unit_mw":277,"name":"Siemens-Westinghouse Model KN steam turbine generator"},{"manufacturer_domain":"cicgroup.com","product_url":"https://cicgroup.com/nooter-eriksen/heat-recovery-steam-generators-hrsgs/","count":2,"unit_mw":null,"name":"Nooter-Eriksen heat recovery steam generator (HRSG) with duct burner"},{"manufacturer_domain":"gea.com","product_url":null,"count":2,"unit_mw":null,"name":"GEA air-cooled condenser"},{"manufacturer_domain":"alfalaval.com","product_url":"https://www.alfalaval.com/products/heat-transfer/air-heat-exchangers-wetted/wet-surface-air-heat-exchangers/wet-surface-air-coolers/","count":1,"unit_mw":null,"name":"Niagara Blower Co. Model RWC 48240-2F16 wet-surface air cooler"}] — Source · confidence: high
- Product family: 7FA — Source · confidence: high
- Manufacturer name: General Electric — Source · confidence: high
- Equipment models.0: {"manufacturer_domain":"gevernova.com","product_url":"https://www.gevernova.com/gas-power/products/gas-turbines/7f","count":2,"unit_mw":171.7,"name":"General Electric 7FA gas turbine"} — Source · confidence: high
- Equipment models.1: {"manufacturer_domain":"siemens-energy.com","product_url":"https://www.siemens-energy.com/global/en/home/products-services/product-offerings/steam-turbines.html","count":1,"unit_mw":277,"name":"Siemens-Westinghouse Model KN steam turbine generator"} — Source · confidence: high
- Equipment models.2: {"manufacturer_domain":"cicgroup.com","product_url":"https://cicgroup.com/nooter-eriksen/heat-recovery-steam-generators-hrsgs/","count":2,"unit_mw":null,"name":"Nooter-Eriksen heat recovery steam generator (HRSG) with duct burner"} — Source · confidence: high
- Equipment models.3: {"manufacturer_domain":"gea.com","product_url":null,"count":2,"unit_mw":null,"name":"GEA air-cooled condenser"} — Source · confidence: high
- Equipment models.4: {"manufacturer_domain":"alfalaval.com","product_url":"https://www.alfalaval.com/products/heat-transfer/air-heat-exchangers-wetted/wet-surface-air-heat-exchangers/wet-surface-air-coolers/","count":1,"unit_mw":null,"name":"Niagara Blower Co. Model RWC 48240-2F16 wet-surface air cooler"} — Source · confidence: medium
- Equipment models.4: {"manufacturer_domain":"alfalaval.com","product_url":"https://www.alfalaval.com/products/heat-transfer/air-heat-exchangers-wetted/wet-surface-air-heat-exchangers/wet-surface-air-coolers/","count":1,"unit_mw":null,"name":"Niagara Blower Co. Model RWC 48240-2F16 wet-surface air cooler"} — Evaporative air cooler - Wet Surface Air Coolers · confidence: medium
- Description: Otay Mesa Generating Project is an operating natural-gas-fired combined-cycle plant in San Diego County, California, with three operating generators totaling 710.7 MW of nameplate capacity and operating in the CAISO balancing area. The facility is operated by Otay Mesa Energy Center, LLC; Calpine acquired the project from PG&E National Energy Group in July 2001, and Calpine’s parent became Constellation following the January 2026 Calpine transaction. The California Energy Commission describes the configuration as two power islands with air-cooled condensers, a 230-kV switchyard, two F-class combustion turbines, heat-recovery steam generators, and a steam turbine associated with each power train. Construction was delayed and restarted before the plant entered commercial operation on October 3, 2009; a proposed 2019 purchase by San Diego Gas & Electric was not completed. — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Quality notes: ["Reported capacity varies by source and rating convention: the current EIA-derived record reports 710.7 MW nameplate across three generators, while CEC, CPUC, and 2007 financing records reported approximately 510 MW, 573 MW, and 596 MW, respectively. The 710.7-MW figure is used for the exact EIA plant 55345 identity.","The July 2001 Calpine acquisition announcement confirms the buyer, seller, and closing date but does not disclose project-level sale consideration in the cited materials.","The 2007 $377 million facility was project financing for construction and was non-recourse to Calpine; it should not be treated as the project’s acquisition price.","SDG&E’s 2019 put/call arrangement did not result in an asset sale: the put option was rescinded and SDG&E proceeded with a 59-month power-purchase agreement instead. The cited later permit record documents renewal and minor modifications to existing turbine equipment, not a completed expansion, retirement, or repowering."] — Brown Agenda Dec. Revision 1 Approving Revised Power Purchase Agreement for Otay Mesa Generating Plant and Modifying Decision 06-02-031 · confidence: medium
- Quality notes: ["Reported capacity varies by source and rating convention: the current EIA-derived record reports 710.7 MW nameplate across three generators, while CEC, CPUC, and 2007 financing records reported approximately 510 MW, 573 MW, and 596 MW, respectively. The 710.7-MW figure is used for the exact EIA plant 55345 identity.","The July 2001 Calpine acquisition announcement confirms the buyer, seller, and closing date but does not disclose project-level sale consideration in the cited materials.","The 2007 $377 million facility was project financing for construction and was non-recourse to Calpine; it should not be treated as the project’s acquisition price.","SDG&E’s 2019 put/call arrangement did not result in an asset sale: the put option was rescinded and SDG&E proceeded with a 59-month power-purchase agreement instead. The cited later permit record documents renewal and minor modifications to existing turbine equipment, not a completed expansion, retirement, or repowering."] — ENGINEERING EVALUATION · confidence: medium
- Commercial parties.5: {"relationship":"Project-finance arranger and lender","name":"ING Capital LLC","detail":"ING Capital LLC jointly arranged the $377 million non-recourse construction and term-loan facility obtained by OMEC in May 2007.","official_url":"https://www.ing.com/"} — Calpine unit inks $377 million power plant finance deal · confidence: high
- Commercial parties.6: {"relationship":"Project-finance arranger and lender","name":"BayernLB","detail":"BayernLB jointly arranged the $377 million non-recourse construction and term-loan facility obtained by OMEC in May 2007.","official_url":"https://www.bayernlb.com/"} — Calpine unit inks $377 million power plant finance deal · confidence: high
- Commercial parties.11: {"relationship":"Combustion-turbine supplier","name":"GE Power","detail":"GE supplied the project’s combustion turbines. The current official GE Vernova gas-turbine product page is provided as the corporate product URL.","official_url":"https://www.gevernova.com/gas-power/products/gas-turbines"} — Source · confidence: medium
- Commercial parties.12: {"relationship":"Steam-turbine supplier","name":"Siemens Westinghouse","detail":"Siemens Westinghouse supplied the project’s steam turbine equipment.","official_url":"https://www.siemens-energy.com/global/en/home/products-services/product-offerings/gas-turbines.html"} — Source · confidence: medium
- Commercial parties.15: {"relationship":"Former parent and seller in corporate portfolio transaction","name":"Energy Capital Partners","detail":"ECP acquired Calpine in 2018 and sold Calpine to Constellation in the transaction announced in January 2025 and completed in January 2026. This was a Calpine corporate transaction, not a disclosed direct sale of Otay Mesa.","official_url":"https://www.ecpgp.com/"} — Constellation to Acquire Calpine; Creates America’s Leading Producer of Clean and Reliable Energy to Meet Growing Demand for Customers and Communities · confidence: medium
- Commercial parties.15: {"relationship":"Former parent and seller in corporate portfolio transaction","name":"Energy Capital Partners","detail":"ECP acquired Calpine in 2018 and sold Calpine to Constellation in the transaction announced in January 2025 and completed in January 2026. This was a Calpine corporate transaction, not a disclosed direct sale of Otay Mesa.","official_url":"https://www.ecpgp.com/"} — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Later sale or transfer: The California Energy Commission later recorded ownership transfers from Otay Mesa Generating Project, LLC to Otay Mesa Energy Center, LLC on September 30, 2005, and to Calpine Corporation on March 22, 2006. On January 7, 2026, Constellation completed its acquisition of Calpine from Energy Capital Partners; Otay Mesa Energy Center, LLC was listed as a Calpine subsidiary in a 2026 SEC subsidiary exhibit, supporting classification as a corporate-parent-only transfer rather than a separately documented plant sale. — Otay Mesa Energy Center | California Energy Commission · confidence: medium
- Later sale or transfer: The California Energy Commission later recorded ownership transfers from Otay Mesa Generating Project, LLC to Otay Mesa Energy Center, LLC on September 30, 2005, and to Calpine Corporation on March 22, 2006. On January 7, 2026, Constellation completed its acquisition of Calpine from Energy Capital Partners; Otay Mesa Energy Center, LLC was listed as a Calpine subsidiary in a 2026 SEC subsidiary exhibit, supporting classification as a corporate-parent-only transfer rather than a separately documented plant sale. — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Substation: Otay Mesa Substation — D0506061 Certifies and Grants CPCN for SDG&E's Otay Mesa Transmission Project · confidence: medium
- Interconnection voltage kv: 230 — Otay Mesa Energy Center | California Energy Commission · confidence: high
- Transmission owner: San Diego Gas & Electric (SDG&E) — Source · confidence: medium
- Status detail: Operating as of 2026-08-02, with three operational generators totaling 710.7 MW. Calpine's February 6, 2026 operating-plant table lists Otay Mesa Energy Center as a WECC California combined-cycle facility; CAISO's 2027 local-capacity materials identify OTAYMGT1, OTAYMGT2, and OTAYMST1 at the plant. No qualifying retirement date or unit-level mothball, standby, seasonal-operation, or repowering event is established; CAISO reports no resource projected to retire that directly affects its 2027–2031 local-capacity results. — Table of Operating Power Plants and Projects Under Construction as of: Friday, February 6, 2026 · confidence: medium
- Status detail: Operating as of 2026-08-02, with three operational generators totaling 710.7 MW. Calpine's February 6, 2026 operating-plant table lists Otay Mesa Energy Center as a WECC California combined-cycle facility; CAISO's 2027 local-capacity materials identify OTAYMGT1, OTAYMGT2, and OTAYMST1 at the plant. No qualifying retirement date or unit-level mothball, standby, seasonal-operation, or repowering event is established; CAISO reports no resource projected to retire that directly affects its 2027–2031 local-capacity results. — Source · confidence: medium
- Operating status: operating — Otay Mesa Energy Center | California Energy Commission · confidence: high

## Timeline

- 2001-04-18 — CEC certification
  The California Energy Commission certified the Otay Mesa project under CEC docket 99-AFC-05.
  Source: Otay Mesa Energy Center | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/otay-mesa-energy-center)
- 2001-07 — Acquisition closed
  Calpine completed its acquisition of the exact Otay Mesa Generating Project from PG&E National Energy Group. The SEC filing reports a $4.9 million purchase price plus assumption of a capital lease obligation. The asset was identified in contemporary records as being in San Diego County, California.
  Source: PG&E Corporation - Calpine Corporation Completes Acquisition Of San Diego Power Project From PG&E National Energy Group (https://investor.pgecorp.com/news-events/press-releases/press-release-details/2001/Calpine-Corporation-Completes-Acquisition-Of-San-Diego-Power-Project-From-PGE-National-Energy-Group/default.aspx)
- 2001-07-10 — Power purchase agreement
  As part of the project sale, PG&E National Energy Group agreed to a 10-year tolling arrangement for up to 250 MW of Otay Mesa output. This tolling agreement is separate from the later SDG&E offtake arrangement.
  Source: PG&E Corporation - Calpine Corporation Completes Acquisition Of San Diego Power Project From PG&E National Energy Group (https://investor.pgecorp.com/news-events/press-releases/press-release-details/2001/Calpine-Corporation-Completes-Acquisition-Of-San-Diego-Power-Project-From-PGE-National-Energy-Group/default.aspx)
- 2001-Q3 — Initial construction plan
  The CEC record anticipated construction beginning in the third quarter of 2001 and estimated project capital costs at approximately $350 million, with commercial operation then anticipated in the fourth quarter of 2003.
  Source: Source (https://efiling.energy.ca.gov/GetDocument.aspx?tn=19846&DocumentContentId=69881)
- 2007-05-04 — Construction financing and restart
  OMEC obtained a $377 million project-finance credit facility. The construction loan was to convert to a term loan at commercial operation, and Calpine said construction would recommence in May 2007 with startup, testing, and commissioning targeted for May 2009.
  Source: Calpine unit inks $377 million power plant finance deal (https://www.power-eng.com/operations-maintenance/calpine-unit-inks-377-million-power-plant-finance-deal/)
- 2009-10-03 — Commercial operation
  The California Energy Commission records the start of commercial operation for Otay Mesa Energy Center on October 3, 2009.
  Source: Otay Mesa Energy Center | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/otay-mesa-energy-center)
- 2019 — Original tolling term ended without asset sale
  At the end of the original 10-year PPA, Calpine’s subsidiary rescinded the put option that would have required SDG&E to purchase the plant for $280 million. SDG&E instead entered a 59-month power-purchase agreement, and Calpine employees continued operating the facility.
  Source: SDG&E will not have to buy the Otay Mesa Energy Center for $280 million – San Diego Union-Tribune (https://www.sandiegouniontribune.com/2019/10/01/sdge-will-not-have-to-buy-the-otay-mesa-energy-center-for-280-million/)
- 2025-02-20 — Permit renewal and minor modifications
  The San Diego County Air Pollution Control District record documents a Title V permit renewal and minor modifications involving the facility’s existing natural-gas turbine equipment; it does not document a completed retirement or repowering.
  Source: ENGINEERING EVALUATION (https://www.sdapcd.org/content/dam/sdapcd/documents/permits/public-notices/OMEC-APP005651-Statement-of-Basis.pdf)

## Sources

- [Calpine: America's Premier Competitive Power Company](https://www.calpine.com/) — calpine.com · tier other
- [Schedule 6A, 'Boiler / Generator Associations'](https://downloads.regulations.gov/EPA-R06-OAR-2025-0197-0061/attachment_16.pdf) — downloads.regulations.gov · tier regulatory
- [qfer eia caiso](https://www.sce.com/sites/default/files/inline-files/ExhibitC1_1_CECCaliforniaPowerPlants.xls) — sce.com · tier other
- [Draft 2027 Local Capacity Technical Report](https://www.caiso.com/documents/apr-3-2026-draft-2027-local-capacity-technical-report-resource-adequacy-program-r-25-10-003.pdf) — caiso.com · tier other
- [Otay Mesa Energy Center | California Energy Commission](https://www.energy.ca.gov/powerplant/combined-cycle/otay-mesa-energy-center) — energy.ca.gov · tier regulatory
- [Forms S-1](https://efiling.energy.ca.gov/GetDocument.aspx?tn=228710&DocumentContentId=59607) — efiling.energy.ca.gov · tier regulatory
- [PG&E Corporation - Calpine Corporation Completes Acquisition Of San Diego Power Project From PG&E National Energy Group](https://investor.pgecorp.com/news-events/press-releases/press-release-details/2001/Calpine-Corporation-Completes-Acquisition-Of-San-Diego-Power-Project-From-PGE-National-Energy-Group/default.aspx) — investor.pgecorp.com · tier other
- [Power plant profile: Otay Mesa Energy Center, US](https://www.power-technology.com/data-insights/power-plant-profile-otay-mesa-energy-center-us/) — power-technology.com · tier other
- [Library | A.04-03-008 Otay Mesa power purchase agreement transmission project | California ISO](https://www.caiso.com/library/a0403008-otay-mesa-power-purchase-agreement-transmission-project) — caiso.com · tier other
- [Source](https://energy.ca.gov/powerplant/combined-cycle/otay-mesa-energy-center) — energy.ca.gov · tier regulatory
- [Source](https://www.sdapcd.org/content/dam/sdapcd/documents/permits/public-notices/Otay-Mesa-Energy-Center-Statement-of-Basis.pdf) — sdapcd.org · tier other
- [7F Heavy Duty Gas Turbine | 7F.04/7F.05](https://www.gevernova.com/gas-power/products/gas-turbines/7f) — gevernova.com · tier other
- [Evaporative air cooler - Wet Surface Air Coolers](https://www.alfalaval.com/products/heat-transfer/air-heat-exchangers-wetted/wet-surface-air-heat-exchangers/wet-surface-air-coolers/) — alfalaval.com · tier other
- [Constellation Completes Calpine Transaction, Powering America's Clean Energy Future](https://constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html) — constellationenergy.com · tier other
- [Brown Agenda Dec. Revision 1 Approving Revised Power Purchase Agreement for Otay Mesa Generating Plant and Modifying Decision 06-02-031](https://docs.cpuc.ca.gov/published/AGENDA_DECISION/59488.htm) — docs.cpuc.ca.gov · tier regulatory
- [ENGINEERING EVALUATION](https://www.sdapcd.org/content/dam/sdapcd/documents/permits/public-notices/OMEC-APP005651-Statement-of-Basis.pdf) — sdapcd.org · tier other
- [Calpine unit inks $377 million power plant finance deal](https://www.power-eng.com/operations-maintenance/calpine-unit-inks-377-million-power-plant-finance-deal/) — power-eng.com · tier other
- [Constellation to Acquire Calpine; Creates America’s Leading Producer of Clean and Reliable Energy to Meet Growing Demand for Customers and Communities](https://www.constellationenergy.com/news/2025/constellation-to-acquire-calpine-creates-americas-leading-producer-of-clean-and-reliable-energy-to-meet-growing-demand-for-customers-and-communities.html) — constellationenergy.com · tier other
- [Source](https://efiling.energy.ca.gov/GetDocument.aspx?tn=19846&DocumentContentId=69881) — efiling.energy.ca.gov · tier regulatory
- [SDG&E will not have to buy the Otay Mesa Energy Center for $280 million – San Diego Union-Tribune](https://www.sandiegouniontribune.com/2019/10/01/sdge-will-not-have-to-buy-the-otay-mesa-energy-center-for-280-million/) — sandiegouniontribune.com · tier other
- [Source](https://energyonline.com/Industry/News.aspx?Calpine%27s_Otay_Mesa_Energy_Center_Delivers_Power_to_the_Grid&NewsID=7398) — energyonline.com · tier other
- [D0506061 Certifies and Grants CPCN for SDG&E's Otay Mesa Transmission Project](https://docs.cpuc.ca.gov/published/Final_decision/47623-05.htm) — docs.cpuc.ca.gov · tier regulatory
- [Source](https://www.caiso.com/documents/may-1-2026-final-2027-local-capacity-technical-report-and-update-regarding-2027-flexible-capacity-needs-assessment-resource-adequacy-program-r-25-10-003.pdf) — caiso.com · tier other
- [Source](https://www.caiso.com/documents/openingbrief-californiaisoindocketno_a_04-03-008_otaymesapowerpurchaseagreement.pdf) — 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

## Data quality

- Reported capacity varies by source and rating convention: the current EIA-derived record reports 710.7 MW nameplate across three generators, while CEC, CPUC, and 2007 financing records reported approximately 510 MW, 573 MW, and 596 MW, respectively. The 710.7-MW figure is used for the exact EIA plant 55345 identity. The cited later permit record documents renewal and minor modifications to existing turbine equipment, not a completed expansion, retirement, or repowering.

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