Hanford Emergency Peaker Project

Docket Number:

01-EP-07 (Application For Certification)
01-EP-07C (Compliance Proceeding)

Project Status: Licensed; In Compliance Phase.
Operational: September 3, 2001

The California Energy Commission approved this project's Small Power Plant Exemption on May 7, 2001. The Commission monitors the power plant's construction, operation and eventual decommissioning through a compliance proceeding.

Key Dates

  • 4/9/2001 - Small Power Plant Exemption (EP) filed
  • 4/12/2001 - Commission accepts EP as "data adequate."
  • 5/7/2001 - Commission approves Small Power Plant Exemption.
  • 9/3/2001 - Power plant on line and producing power.


On May 10, 2001, the California Energy Commission (Energy Commission) approved a license (Original License) for the Hanford Energy Park Emergency Peaker Project (HEPP), a 95 megawatt natural-gas fired simple-cycle peaking facility located approximately three miles south of the City of Hanford, Kings County (GWF Hanford Peaker). The HEPP consists of two aero-derivative General Electric LM6000 combustion turbine-generator sets operating in simple-cycle mode equipped with dry, low oxides of nitrogen combustors and steam injection capability. The HEPP presently uses up to 150 acre-feet per year of groundwater from a well located on the project owner’s adjacent cogeneration plant for plant cooling and other uses. The project began commercial operation on September 2, 2001.

On March 24, 2010, the Energy Commission approved an amendment (Amended License) allowing the conversion of the GWF Hanford Peaker to a combined-cycle facility known as the GWF Hanford Combined-Cycle Power Project.

Based on changing market conditions, GWF Energy LLC (GWF) did not move forward with the combined-cycle conversion as expected. On November 17, 2014, the Energy Commission approved a petition for the revocation of the 2010 Amended Final Decision for the GWF Hanford Combined Cycle Power Project and the reinstatement and extension of the original 2001 Hanford Energy Park Emergency Peaker Project Certification.

On April 13, 2016, ownership of the HEPP was transferred GWF Energy LLC to AltaGas San Joaquin Energy Inc., and operational control of the HEPP was transferred from Star West Generation Management Company to AltaGas Tracy Operations Inc.

Small Power Plant Exemption Evaluation Process

The SPPE process allows projects between 50 and 100 MW to proceed with local approval rather than requiring an Energy Commission license. This exemption from the Energy Commission licensing process can be applied to projects that would not create a substantial adverse impact on the environment or energy resources. The Energy Commission acts as the lead agency under the California Environmental Quality Act (CEQA) and will prepare an Initial Study and Mitigated Negative Declaration that examines public health and safety, along with environmental impacts of the proposed project, including all related facilities such as electric transmission lines, natural gas and water pipelines. If the exemption is granted, the applicant would still need to secure the appropriate licenses and permits from relevant local, state, and federal agencies.

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
E-mail: Anwar.Ali@energy.ca.gov

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
E-mail: PublicAdviser@energy.ca.gov

News Media Please Contact:

Media & Public Communications Office
Phone: 916-654-4989
E-mail: mediaoffice@energy.ca.gov

Compliance Proceeding

Original Proceeding



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