Project Status: Licensed; In Compliance Phase.
Operational: December 22, 2010

The California Energy Commission approved this project's Application For Certification on April 23, 2008. The Commission monitors the power plant's construction, operation and eventual decommissioning through a compliance proceeding.

Key Dates

General Description of Project

In 2008, the California Energy Commission (Energy Commission) approved and licensed Pacific Gas and Electric Company's (PG&E) Colusa Generating Station (CGS) Project. The nominal 660-megawatt combined-cycle project site is located in the unincorporated portion of Colusa County, approximately 6 miles north of the community of Maxwell. on a 100-acre parcel that is leased from the 4,800 acre Holthouse Ranch property, approximately 14 miles north of Williams and 4 miles west of Interstate 5 in Colusa County.

The CGS is fueled by natural gas delivered to the site via an 8 inch, 1,500-foot pipeline owned and operated by PG&E. Water for the project is provided by the Glenn-Colusa Irrigation District (GCID) via the Tehama-Colusa Canal (TCC), which is located to the west of the project site. The project uses a Zero Liquid Discharge wastewater system. Air emissions from the facility are controlled using Best Available Control Technology with air pollution credits obtained from the Colusa County Air Pollution Control District.

The facility is interconnected to the nearby existing electrical infrastructure owned by PG&E. The electrical switchyard and transmission facilities allow delivery of the power plant’s output to PG&E’s existing Cottonwood to Vaca-Dixon 230-kilovolt (kV) transmission corridor located approximately 1,800 feet east of the project site.

To ensure CGS would continue to have a reliable water supply, in May 2014 PG&E submitted a petition to amend to construct an approximately 0.86-mile back-up water supply pipeline from the GCID Glen Colusa Canal to the CGS. This petition was approved by Energy Commission staff in September 2014. The back-up water supply pipeline transports GCID water allocated to the CGS when there is insufficient water in the TCC for use by CGS. The back-up water supply pipeline eliminates the need for trucking the water to the site, as approved under an emergency amendment petition approved in April 2014.

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:

Anwar Ali
Project Manager
Siting, Transmission and Environmental Protection (STEP) Division
California Energy Commission
1516 Ninth Street, MS-15
Sacramento, CA 95814
Phone: 916-698-7498

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

Colusa List Serve

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