Project Status: Licensed; In Compliance Phase.
Operational: February 24, 2006

The California Energy Commission approved this project's Application For Certification on September 9, 2003. The Commission monitors the power plant's construction, operation and eventual decommissioning through a compliance proceeding.

Key Dates

  • September 13, 2001 - Application for Certification (AFC) filed
  • November 14, 2001 - Commission accepts AFC as "data adequate."
  • September 9, 2003 - Commission approves Application for Certification.
  • February 24, 2006 - Power plant on line and producing power.

General Description of Project

The Cosumnes Power Plant is a nominal 1,000 megawatt (MW) combined-cycle natural gas facility at the Rancho Seco Nuclear Plant, 25 miles southeast of the City of Sacramento, in Sacramento County. The project is located on a 30-acre portion of an overall 2,480-acre site owned by Sacramento Municipal Utility District (SMUD).

The plant was constructed in two phases, each consisting of 500 MW. Each phase has two combustion turbines, one condensing steam turbine, and two heat recovery steam generators. The transmission line consists of 0.4 miles of new 230 kilovolt (kV) line from the on-site switchyard to the existing switchyard at Rancho Seco. The natural gas line is supplied by 26-miles of district-owned gas line. The line is located between the project site and the Carson Ice-Gen Facility, in Sacramento County. A 0.4 mile connection to the existing 66-inch diameter water line conveys water from the Folsom-South Canal.

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 Certification Proceeding Contact:

Mary Dyas
Compliance Project Manager
Siting, Transmission and Environmental Protection (STEP) Division
California Energy Commission
1516 Ninth Street, MS-2000
Sacramento, CA 95814
Phone: 916-628-5418

For Questions About Public Participation In Certification Proceedings Contact:

Public Advisor
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

SMUD Cosumnes Power Plant
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