Marsh Landing Generating Station

Docket Number:

08-AFC-03 (Application For Certification)
08-AFC-03C (Compliance Proceeding)

Project Status: Licensed; In Compliance Phase.
Operational: May 1, 2013

The California Energy Commission approved this project's Application For Certification on August 25, 2010. The Commission monitors the power plant's construction, operation and eventual decommissioning through a compliance proceeding.

Key Dates


Mirant Marsh Landing, LLC filed an Application for Certification (AFC) on May 30, 2008 to construct and operate the Marsh Landing Generating Station (MLGS), a 930 megawatt (MW) natural gas-fired combined cycle power plant, just north of the City of Antioch in Contra Costa County. On September 19, 2008, the applicant provided a Data Adequacy Supplement to the AFC to satisfy the Energy Commission's informational requirements. On September 24, 2008, the Energy Commission accepted the AFC with the supplemental information as complete. On September 16, 2009, Mirant Marsh Landing submitted an amendment to the AFC modifying the MLGS to constitute a nominal 760 MW facility consisting of four combustion turbines operating in simple-cycle mode.

The MLGS facility is proposed for a 27-acre industrial site north of Wilbur Avenue, one mile northeast of the City of Antioch, and south of the San Joaquin River. Highway 4 and the Antioch Bridge are approximately 0.7 miles east of the site. The MLGS would be constructed adjacent to the recently-completed Gateway Power Station and the existing Contra Costa Power Plant (CCPP), an older facility which is scheduled to be retired when the Marsh Landing Generating Station is complete. The existing CCPP has a once-through cooling system, which draws cooling water from the San Joaquin River and then discharges it back into the river after use. The new MLGS would be a simple-cycle facility that would not use river water for cooling or process water requirements. The MLGS project would have a nominal electrical output of 760 MWs generated from four Siemens 5000F combustion turbine units operating in simple-cycle mode. The new 230-kV circuit lines would be interconnected to the existing PG&E switchyard located adjacent to the MLGS site. The MLGS would use natural gas that would be delivered via a new pipeline that would connect to PG&E's interstate gas transmission Line 400, which runs approximately 0.25 miles east of the MLGS site.

If approved by the Energy Commission, MLGS would take approximately 27 months to construct, with a workforce of 272 tradesman and construction workers and a budget of $550 Million.

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 Contact:

Anwar Ali
Project Manager
Siting, Transmission and Environmental Protection (STEP) Division
California Energy Commission
1516 Ninth Street, MS-15
Sacramento, CA 95814
Phone: 916-654-5020

For Questions About Participation In Siting Cases Contact:

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

News Media Please Contact:

Media & Public Communications Office
Phone: 916-654-4989

Compliance Proceeding

Original Proceeding



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