- Docket Number
- 1,000 MW
- Sacramento County
- Combined Cycle
- Project Status
- Operational (Natural Gas-Fired)
- Project Type
- Application for Certification
The Sacramento Municipal Utility District’s (SMUD) Cosumnes Power Plant (CPP) is located adjacent to the Rancho Seco Nuclear Plant, 25 miles southeast of the city of Sacramento, Sacramento County.
CPP is a nominal 603-megawatt (MW) combined-cycle, natural gas-fired facility consisting of 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 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.
The original Application for Certification was for a two-phase project, each phase consisting of 500 MW. Phase 2 was never constructed. In the event SMUD files an Application for Certification for Phase 2 (500 MW) of the project, the CEC’s review will be limited to Air Quality, Water Resources (including the use of recycled water for cooling based upon the stipulation between SMUD and Commission staff), and Transmission System Engineering, unless any of the circumstances identified in the CEQA Guidelines, section 15162 (a)(1)-(3) regarding substantive changes or new information have occurred or there have been changes to applicable law.
On December 10, 2018 the California Energy Commission approved a Post-Certification Amendment (TN 226231) to operate previously installed Advanced Gas Path upgrade components, Dry-Low Nitrogen 2.6+ combustors, and oxidation catalyst emission control systems. This would increase electrical production from each of the two licensed combustion turbine generators from 170 MW to 198 MW, an increase 56 MW total. The overall CPP electrical output would increase from 534 MW to 603 MW, an increase of 69 MW.
Power Plant Certification and Exemption Processes
As required by the Warren-Alquist Act, the Energy Commission monitors Commission-certified energy projects throughout construction, operation, and closure to ensure compliance with the conditions of certification imposed by the Commission’s Final Decision for approving the projects.