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Marsh Landing Generating Station
Power Plant Licensing Case

Docket Number:

2008-AFC-3C
(Compliance Proceeding)
2008-AFC-03
(Application For Certification)

 

Committee Overseeing This Case:

James D. Boyd, Vice Chair
Presiding Member

Karen Douglas, Chairman
Associate Member

 

Hearing Officer: Paul Kramer

 

Key Dates

  • 5/30/2008 - Application for Certification (AFC) filed with California Energy Commission
  • 9/24/2008 - Commission accepts AFC as "data adequate."
  • 4/26/2010 - Commission staff releases its Staff Assessment.
  • 7/23/2010 - Committee releases Presiding Member's Proposed Decision.
  • 8/25/10 - Commission approves Application For Certification.

General Description of Project

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 Energy Commission is responsible for reviewing and ultimately approving or denying all applications to construct and operate thermal electric power plants, 50 MW and greater, in California. The Energy Commission's facility certification process carefully examines public health and safety, environmental impacts, and engineering aspects of proposed power plants and all related facilities, such as electric transmission lines and natural gas and water pipelines. The issuance of a certificate by the Energy Commission is in lieu of any local, state or federal permit (to the extent permitted by federal law). The Energy Commission is the Lead Agency under the California Environmental Quality Act (CEQA), although it produces several environmental and decision documents rather than an Environmental Impact Report.

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