Henrietta Peaker Project

The Henrietta Peaker Power Plant (HPP) is located adjacent to Pacific Gas & Electric’s 70 kilovolt (kV) Henrietta Substation approximately one mile south of Highway 198 on 25th Avenue southeast of the City of Lemoor, Kings County.

HPP is a nominal 95-megawatt (MW) natural-gas fired, simple-cycle peaking facility consisting of two GE LM‐6000 natural gas‐fired combustion turbine generator (CTG) units.

HPP was placed in service on July 1, 2002, and initially operated under terms and conditions of a Power Purchase Agreement (PPA) with the California Department of Water Resources (DWR). The DWR PPA was subsequently novated and replaced by a PPA with Pacific Gas and Electric (PG&E) for operation of the HPP in simple cycle mode. The HPP currently operates under the terms and conditions of the PG&E PPA.

The HPP is approved to use up to 158 acre-feet per year of water for plant operations. The source of this water is from the federal Valley Project and State Water Project allocations purchased through Kings County. The project also utilizes a permanent, single-pass reverse osmosis system for water deionizing treatment.

On March 24, 2010, the California Energy Commission (CEC) approved a Post-Certification Amendment (PTA) (TN 56498) allowing the conversion of the simple-cycle Henrietta Peaker Project to the 120 MW GWF Henrietta Combined-Cycle Power Plant by adding two once-through steam generators to recover heat from the exhaust of the existing turbines and produce steam to power a new 25 MW steam turbine generator. The project was never converted.

On November 17, 2014, GWF Energy, LLC , the CEC approved a PTA (TN 203380) requesting the revocation of the 2010 Amended Final Decision for the GWF Henrietta Combined-Cycle Power Plant, and the reinstatement of the original 2002 certification to operate the facility as the simple-cycle Henrietta Peaker Project, allowing the continued operation of the Henrietta Peaker Project in compliance with the original 2002 Certification.

On March 1, 2023, the California Energy Commission (CEC) approved a Post-Certification Amendment (PTA) (TN 249048) allowing the installation of an interconnection of a battery energy storage system (BESS) and to identify Henrietta LLC as the party that will have legal and CEC compliance responsibilities for the operation of the Henrietta BESS. While the battery system will be located on the existing Henrietta site, the natural gas facility and BESS will have separate ownership and obligations under the conditions of certification, the two facilities will share some common infrastructure components.