El Segundo Power Plant
2013 Amendment Proceeding

Docket Number:

00-AFC-14C (Amendment Proceeding)


Project Status: Licensed; 2013 Amendment In Review.



Key Dates


General Description of Project

Originally built in the 1950s, the ESEC was a 1,052-megawatt (MW) power plant consisting of four natural gas-fired utility boiler generating units. In 2000, the project owner applied to the Energy Commission to demolish and replace Units 1 and 2 with combined cycle Units 5, 6, and 7 and continue the use of once thru cooling. The project was certified by the Energy Commission on February 3, 2005. In 2007, the owner petitioned to amend the 2005 Decision to install smaller rapid start combined cycle units using dry cooling technology and designated as Units 5 & 6 and 7 & 8. The Commission approved this petition on June 30, 2010. NRG started construction on Units 5 – 8 in June 2011. The project commenced commercial operation August 1, 2013

Description of Proposed Modification

El Segundo Energy Center LLC (ESEC LLC) a wholly owned subsidiary of NRG Energy, Inc. (NRG), proposes to make substantial changes to the ESEC. Primary changes include the demolition and replacement of two once-through-cooled natural gas-fired utility boiler units, Units 3 and 4, with one new combined cycle generator (Unit 9), one steam turbine generator (Unit 10) and two simple-cycle gas turbines (Units 11 and 12). This change will eliminate the use of ocean water for once-through cooling at the facility. The proposed changes will also upgrade and improve the ESEC’s existing and approved site infrastructure, provide fast start and dispatch flexibility capabilities to support Southern California grid load balancing and renewable energy integration, and implement improvements to coastal access.

Specific changes proposed through this Petition to Amend (PTA) include:

  • Shutdown and demolition of Units 3 and 4;
  • Removal and remediation of existing ESEC retention basins;
  • Construction of a new, combined administration, maintenance, and operations support building;
  • Modifications to existing site access; and
  • Improvements to beach access.

The following new major equipment will be installed:

  • (Unit 9) - One NRG fast start combined-cycle generator unit (CC Fast), rated at 222 MW net, incorporating a General Electric natural gas combustion turbine generator designed to achieve 75 percent of base load output in 10 minutes;
  • One two-pressure, duct-fired heat recovery steam generator (HRSG) designed for rapid startup with conventional SCR/carbon monoxide (CO) catalysts;
  • (Unit 10) - One single-case, non-reheat axial exhaust admission condensing steam turbine generator (STG) rated at 112 MW and designed for non-traditional elevated condensing pressure to minimize cooling system size;
  • One Heller dry cooling tower system;
  • (Units 11 and 12) - Two Rolls Royce Trent 60 generators, rated at 55 MW/unit net, consisting of advanced aeroderivative simple-cycle gas turbines; and
  • One Cleaver Brooks auxiliary boiler consisting of a direct contact spray condenser and a mechanically-induced-draft dry-cooling tower.

Energy Commission Facility Certification Process

The California Energy Commission is the lead agency (for licensing thermal power plants 50 megawatts and larger) under the California Environmental Quality Act (CEQA) and has a certified regulatory program under CEQA. Under its certified program, the Energy Commission is exempt from having to prepare an environmental impact report. Its certified program, however, does require environmental analysis of the project, including an analysis of alternatives and mitigation measures to minimize any significant adverse effect the project may have on the environment.



For Questions About This Siting Case, Amendment Proceeding, Contact:

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Public Adviser
California Energy Commission
1516 Ninth Street, MS-12 Sacramento, CA 95814
Phone: 916-654-4489
Toll-Free in California: 1-800-822-6228
E-mail: PublicAdviser@energy.ca.gov

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