# El Segundo Energy Center LLC

CAISO Natural Gas Fired Combined Cycle · https://askthegrid.com/assets/facilities/el-segundo-energy-center-llc

El Segundo Energy Center LLC is a natural gas-fired power facility with 537.4 MW of EIA-reported nameplate capacity in Los Angeles County, California, registered as EIA Plant ID 57901. Clearway Energy is the public owner or developer; NRG Energy Services LLC is the registered plant entity or operator. Its grid role is flexible, rapid-response combined-cycle generation serving peaking and intermediate load; the facility was designed for fast starts and non-spinning reserve service.

## Key facts

- Technology: Natural Gas Fired Combined Cycle
- Power capacity: 537.4 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CISO (California Independent System Operator)

## Source-backed facts

- Owner logo domain: clearwayenergygroup.com — Conventional gas plants - Clearway · confidence: medium
- Identifiers: [{"value":"57901","system":"EIA plant ID"},{"value":"CISO","system":"ISO/RTO balancing authority"},{"value":"00-AFC-14","system":"California Energy Commission docket"},{"value":"ELSEGN_7_UNIT 3","system":"CAISO resource ID"},{"value":"ELSEGN_7_UNIT 4","system":"CAISO resource ID"},{"value":"ELSEGN_2_UN1011","system":"CAISO aggregate resource ID"},{"value":"5","system":"FERC/EIA generator ID"},{"value":"6","system":"FERC/EIA generator ID"},{"value":"115663","system":"SCAQMD facility ID"}] — El Segundo Energy Center | California Energy Commission · confidence: medium
- Identifiers: [{"value":"57901","system":"EIA plant ID"},{"value":"CISO","system":"ISO/RTO balancing authority"},{"value":"00-AFC-14","system":"California Energy Commission docket"},{"value":"ELSEGN_7_UNIT 3","system":"CAISO resource ID"},{"value":"ELSEGN_7_UNIT 4","system":"CAISO resource ID"},{"value":"ELSEGN_2_UN1011","system":"CAISO aggregate resource ID"},{"value":"5","system":"FERC/EIA generator ID"},{"value":"6","system":"FERC/EIA generator ID"},{"value":"115663","system":"SCAQMD facility ID"}] — List of Generation Units by Local Capacity Area · confidence: medium
- Identifiers: [{"value":"57901","system":"EIA plant ID"},{"value":"CISO","system":"ISO/RTO balancing authority"},{"value":"00-AFC-14","system":"California Energy Commission docket"},{"value":"ELSEGN_7_UNIT 3","system":"CAISO resource ID"},{"value":"ELSEGN_7_UNIT 4","system":"CAISO resource ID"},{"value":"ELSEGN_2_UN1011","system":"CAISO aggregate resource ID"},{"value":"5","system":"FERC/EIA generator ID"},{"value":"6","system":"FERC/EIA generator ID"},{"value":"115663","system":"SCAQMD facility ID"}] — Curtailed and Non-Operational Generator AM Report Jul... · confidence: medium
- Official project url: https://www.energy.ca.gov/powerplant/combined-cycle/el-segundo-energy-center — El Segundo Energy Center | California Energy Commission · confidence: high
- Description: El Segundo Energy Center LLC is the EIA-named plant at 301 Vista Del Mar Boulevard in El Segundo, Los Angeles County, California. The facility is a natural-gas-fired combined-cycle plant with four units; the EIA-linked plant record reports 537.4 MW of nameplate capacity, while the California Energy Commission describes the certified facility as nominally 560 MW. The project began commercial operation on August 1, 2013 and is within the California ISO balancing area. — El Segundo Energy Center | California Energy Commission · confidence: high
- Canonical name: El Segundo Energy Center LLC — El Segundo Energy Center | California Energy Commission · confidence: high
- Identifiers.1: {"value":"CISO","system":"ISO/RTO balancing authority"} — El Segundo Energy Center | California Energy Commission · confidence: high
- Identifiers.2: {"value":"00-AFC-14","system":"California Energy Commission docket"} — List of Generation Units by Local Capacity Area · confidence: medium
- Identifiers.3: {"value":"ELSEGN_7_UNIT 3","system":"CAISO resource ID"} — List of Generation Units by Local Capacity Area · confidence: medium
- Identifiers.4: {"value":"ELSEGN_7_UNIT 4","system":"CAISO resource ID"} — Curtailed and Non-Operational Generator AM Report Jul... · confidence: medium
- Identifiers.7: {"value":"6","system":"FERC/EIA generator ID"} — California Energy Commission : Docket Log · confidence: medium
- Parties.0: {"relationship":"Current owner","name":"Clearway Energy","official_url":"https://www.clearwayenergygroup.com/"} — Conventional gas plants - Clearway · confidence: high
- Parties.1: {"relationship":"Registered plant entity and CEC project owner","name":"El Segundo Energy Center LLC","official_url":null} — El Segundo Energy Center | California Energy Commission · confidence: high
- Parties.3: {"relationship":"Historical developer and project owner/operator","name":"NRG Energy, Inc.","official_url":"https://www.nrg.com/"} — El Segundo Energy Center | California Energy Commission · confidence: medium
- Parties.4: {"relationship":"Gas-turbine OEM","name":"Siemens","official_url":"https://www.siemens-energy.com/"} — El Segundo Energy Center | California Energy Commission · confidence: medium
- Parties.4: {"relationship":"Gas-turbine OEM","name":"Siemens","official_url":"https://www.siemens-energy.com/"} — EL SEGUNDO ENERGY CENTER: Unique 'flex' unit design... · confidence: medium
- Site acres: 33 — DOCKETED - CA.gov · confidence: high
- Commercial operation date: 2013-08-01 — El Segundo Energy Center | California Energy Commission · confidence: high
- Unit count: 4 — El Segundo Energy Center | California Energy Commission · confidence: high
- Construction scope: Two Siemens Flex-Plant 10 combined-cycle power islands were built at El Segundo. Each power block includes one SGT6-5000F gas turbine, one SST-800 steam turbine, one SGen6-1000A generator, one SGen6-100A-2P generator, one heat-recovery steam generator, and one air-cooled heat exchanger—two of each across the project. NEM supplied the two DrumPlus HRSGs. Siemens also supplied the complete electrical equipment and SPPA-T3000 instrumentation and control system. The facility is dry-cooled and the two new units entered commercial operation on August 1, 2013. — NRG Energy, Siemens complete 550 MW El Segundo Energy Center · confidence: medium
- Construction scope: Two Siemens Flex-Plant 10 combined-cycle power islands were built at El Segundo. Each power block includes one SGT6-5000F gas turbine, one SST-800 steam turbine, one SGen6-1000A generator, one SGen6-100A-2P generator, one heat-recovery steam generator, and one air-cooled heat exchanger—two of each across the project. NEM supplied the two DrumPlus HRSGs. Siemens also supplied the complete electrical equipment and SPPA-T3000 instrumentation and control system. The facility is dry-cooled and the two new units entered commercial operation on August 1, 2013. — El Segundo Energy Center Opens · confidence: medium
- Product url: https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: high
- Equipment models.4: {"manufacturer_domain":"nem-energy.com","product_url":"https://nem-energy.com/products/heat-recovery-steam-generators-and-waste-heat-recovery-units/","count":2,"unit_mw":null,"name":"DrumPlus heat-recovery steam generator"} — Heat Recovery Steam Generators & Waste Heat Recovery Units - NEM Energy · confidence: high
- Quality notes: ["Reported capacity varies by source and measurement basis: the EIA-linked record reports 537.4 MW, the California Energy Commission reports nominal 560 MW, and Clearway lists 546 MW.","The June 2014 transaction values were reported for a three-asset portfolio containing El Segundo Energy Center, TA High Desert, and RE Kansas South; they should not be treated as El Segundo-specific sale consideration or project-financing amounts.","The cited records identify project-level debt and later debt balances but do not provide a separate original construction-financing close with a definitive lender list. No separate post-2013 generating expansion is identified in the cited project history."] — El Segundo Energy Center | California Energy Commission · confidence: medium
- Quality notes: ["Reported capacity varies by source and measurement basis: the EIA-linked record reports 537.4 MW, the California Energy Commission reports nominal 560 MW, and Clearway lists 546 MW.","The June 2014 transaction values were reported for a three-asset portfolio containing El Segundo Energy Center, TA High Desert, and RE Kansas South; they should not be treated as El Segundo-specific sale consideration or project-financing amounts.","The cited records identify project-level debt and later debt balances but do not provide a separate original construction-financing close with a definitive lender list. No separate post-2013 generating expansion is identified in the cited project history."] — Conventional gas plants - Clearway · confidence: medium
- Quality notes: ["Reported capacity varies by source and measurement basis: the EIA-linked record reports 537.4 MW, the California Energy Commission reports nominal 560 MW, and Clearway lists 546 MW.","The June 2014 transaction values were reported for a three-asset portfolio containing El Segundo Energy Center, TA High Desert, and RE Kansas South; they should not be treated as El Segundo-specific sale consideration or project-financing amounts.","The cited records identify project-level debt and later debt balances but do not provide a separate original construction-financing close with a definitive lender list. No separate post-2013 generating expansion is identified in the cited project history."] — NRG Energy, Inc. · confidence: medium
- Commercial parties.0: {"relationship":"Current owner","name":"Clearway Energy","detail":"Clearway reports 100% ownership of the El Segundo Energy Center and lists it among its flexible natural-gas generation assets.","official_url":"https://www.clearwayenergygroup.com/"} — Conventional gas plants - Clearway · confidence: high
- Commercial parties.1: {"relationship":"Registered plant entity and project owner","name":"El Segundo Energy Center LLC","detail":"The California Energy Commission identifies El Segundo Energy Center, LLC as the project company to which ownership and operational control transferred in August 2008.","official_url":null} — El Segundo Energy Center | California Energy Commission · confidence: high
- Commercial parties.5: {"relationship":"Predecessor owner and 1997 seller","name":"Southern California Edison","detail":"Southern California Edison previously owned and operated the site and sold the El Segundo station/site in the late-1997 portfolio sale.","official_url":"https://www.sce.com/"} — Edison Sells 10 Gas-Fired Plants - Los Angeles Times · confidence: high
- Commercial parties.5: {"relationship":"Predecessor owner and 1997 seller","name":"Southern California Edison","detail":"Southern California Edison previously owned and operated the site and sold the El Segundo station/site in the late-1997 portfolio sale.","official_url":"https://www.sce.com/"} — El Segundo Energy Center | California Energy Commission · confidence: high
- Commercial parties.6: {"relationship":"1997 co-purchaser","name":"Destec Energy","detail":"Destec Energy jointly purchased the El Segundo station/site with NRG Energy from Southern California Edison in the 1997 sale.","official_url":null} — Edison Sells 10 Gas-Fired Plants - Los Angeles Times · confidence: high
- Commercial parties.7: {"relationship":"Combined-cycle equipment supplier and commissioning provider","name":"Siemens Energy","detail":"Siemens supplied and commissioned the two Flex-Plant 10 combined-cycle power islands, including the principal gas- and steam-turbine equipment and plant controls.","official_url":"https://www.siemens-energy.com/"} — NRG Energy, Siemens complete 550 MW El Segundo Energy Center · confidence: medium
- Transaction scope: portfolio_includes_asset — NRG Yield, Inc. Completes Acquisition of NRG Right of First Offer Assets | Clearway Energy, Inc. · confidence: high
- Status detail: Operating. The California Energy Commission lists the El Segundo Energy Center project as operational, while current CAISO records continue to list El Segundo Energy Center 5/6 in the 2026 resource-adequacy data. A separate CAISO transmission-planning entry records an El Segundo steam Unit 3 retirement on 2013-07-27; that legacy steam-unit retirement is not applied to the current ESEC plant because the current CAISO resource-adequacy record identifies ESEC 5/6. — Conventional gas plants - Clearway · confidence: medium
- Grid role: Flexible, rapid-response combined-cycle generation serving peaking and intermediate load; the facility was designed for fast starts and non-spinning reserve service. — El Segundo Energy Center | California Energy Commission · confidence: medium
- Grid role: Flexible, rapid-response combined-cycle generation serving peaking and intermediate load; the facility was designed for fast starts and non-spinning reserve service. — DOCKETED · confidence: medium
- Operating status: operating — El Segundo Energy Center | California Energy Commission · confidence: high
- Operating status: operating — Conventional gas plants - Clearway · confidence: high

## Timeline

- 1997-11 — Predecessor-site acquisition
  Southern California Edison announced the sale of its gas-fired generating plants; NRG Energy and Destec Energy together purchased the El Segundo station/site for $87.75 million.
  Source: Edison Sells 10 Gas-Fired Plants - Los Angeles Times (https://www.latimes.com/archives/la-xpm-1997-nov-25-fi-57429-story.html)
- 1998 — Ownership-transfer application
  A change-of-operator application was submitted to transfer ownership of the site from Southern California Edison to NRG.
  Source: El Segundo Energy Center | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/el-segundo-energy-center)
- 2000 — Redevelopment applications and approval
  El Segundo Energy Center submitted applications for the El Segundo Power Redevelopment Project, proposing demolition of Units 1 and 2 and replacement with two combined-cycle gas turbines. The CEC approved the project in 2005, but construction did not immediately begin because the project lacked a load-serving-entity contract.
  Source: El Segundo Energy Center | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/el-segundo-energy-center)
- 2008-08-13 — Transfer to project company
  Ownership and operational control of the El Segundo Power Redevelopment Project transferred to El Segundo Energy Center, LLC.
  Source: El Segundo Energy Center | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/el-segundo-energy-center)
- 2014-06-30 — Portfolio acquisition by NRG Yield
  NRG Yield, Inc. completed its acquisition from NRG Energy, Inc. of El Segundo Energy Center, TA High Desert, and RE Kansas South for $349 million of cash consideration plus assumed project debt.
  Source: Source (https://www.sec.gov/Archives/edgar/data/1013871/000101387115000018/nrg2015093010q.htm)

## Sources

- [Conventional gas plants - Clearway](https://www.clearwayenergygroup.com/projects/conventional-energy/) — clearwayenergygroup.com · tier other
- [El Segundo Energy Center | California Energy Commission](https://www.energy.ca.gov/powerplant/combined-cycle/el-segundo-energy-center) — energy.ca.gov · tier regulatory
- [List of Generation Units by Local Capacity Area](https://www.caiso.com/documents/list-generationunitsbylocalcapacityarea.pdf) — caiso.com · tier other
- [Curtailed and Non-Operational Generator AM Report Jul ...](https://www.caiso.com/Documents/Curtailed-non-operational-generator-am-report-20150725.html) — caiso.com · tier other
- [EL SEGUNDO ENERGY CENTER: Unique 'flex' unit design ...](https://www.ccj-online.com/el-segundo-energy-center-unique-flex-unit-design-takes-on-the-tough-california-market/) — ccj-online.com · tier other
- [California Energy Commission : Docket Log](https://efiling.energy.ca.gov/Lists/DocketLog.aspx?docketnumber=00-AFC-14C) — efiling.energy.ca.gov · tier regulatory
- [DOCKETED - CA.gov](https://efiling.energy.ca.gov/GetDocument.aspx?tn=202008&DocumentContentId=731) — efiling.energy.ca.gov · tier regulatory
- [NRG Energy, Siemens complete 550 MW El Segundo Energy Center](https://www.renewableenergyworld.com/power-grid/nrg-energy-siemens-complete-550-mw-el-segundo-energy-center/) — renewableenergyworld.com · tier other
- [El Segundo Energy Center Opens](https://www.turbomachinerymag.com/view/el-segundo-energy-center-opens) — turbomachinerymag.com · tier other
- [El Segundo Project - NEM Energy](https://nem-energy.com/projects/el-segundo-project/) — nem-energy.com · tier other
- [SGT6-5000F Heavy-duty gas turbine (60 Hz)](https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html) — siemens-energy.com · tier other
- [Heat Recovery Steam Generators & Waste Heat Recovery Units - NEM Energy](https://nem-energy.com/products/heat-recovery-steam-generators-and-waste-heat-recovery-units/) — nem-energy.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/1013871/000101387115000018/nrg2015093010q.htm) — sec.gov · tier regulatory
- [NRG Energy, Inc.](https://www.sec.gov/Archives/edgar/data/1013871/000101387117000021/nrg2017063010q.htm) — sec.gov · tier regulatory
- [NRG Yield, Inc. Completes Acquisition of NRG Right of First Offer Assets | Clearway Energy, Inc.](https://investor.clearwayenergy.com/news-releases/news-release-details/nrg-yield-inc-completes-acquisition-nrg-right-first-offer-assets) — investor.clearwayenergy.com · tier other
- [Edison Sells 10 Gas-Fired Plants - Los Angeles Times](https://www.latimes.com/archives/la-xpm-1997-nov-25-fi-57429-story.html) — latimes.com · tier other
- [Source](https://www.caiso.com/documents/appendix-a-system-data.pdf) — caiso.com · tier other
- [2026 NQC List](https://www.caiso.com/documents/net-qualifying-capacity-report-for-compliance-year-2026.xlsx) — caiso.com · tier other
- [DOCKETED](https://efiling.energy.ca.gov/GetDocument.aspx?tn=214856&DocumentContentId=7241) — efiling.energy.ca.gov · tier regulatory

## Data quality

- Reported capacity varies by source and measurement basis: the EIA-linked record reports 537.4 MW, the California Energy Commission reports nominal 560 MW, and Clearway lists 546 MW. The cited records identify project-level debt and later debt balances but do not provide a separate original construction-financing close with a definitive lender list. No separate post-2013 generating expansion is identified in the cited project history.

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Source: Ask the Grid — https://askthegrid.com/