Roseville Energy Park (REP) is owned and operated by Roseville Electric Utility. REP is a 120 MW base load and 160 MW duct fired combined cycle, natural gas fueled power plant. The REP is comprised of two Siemens SGT 800 combustion turbine units and a Siemens STG 900 steam turbine. REP utilizes duct firing within the Heat Recovery Steam Generator. The plant has been in commercial operation since October of 2007, serving as an intermediate load resource for demand needs, and supporting local reliability by being interconnected to the Roseville Electric Utility distribution system.
Roseville Sunset Energy Center (RSEC) was originally constructed in 1985 by the Northern California Power Agency (NCPA). It has played a pivotal role in supporting Roseville’s award-winning reliability for decades. The City of Roseville purchased the natural gas-fueled facility from NCPA in 2010 to help provide capacity and reserves for Roseville. Currently, the plant provides 48 megawatts of generation capacity which accounts for approximately 15 percent of our total generating capacity.
To proactively address anticipated demand needs and bolster Roseville's reliability and resilience, we participated in a competitive proposal process with the California Department of Water Resources (CDWR) in 2024 to relocate and install two natural gas generators at RSEC. The CDWR was seeking suitable locations to relocate the generators from Yuba City, with the goal of ensuring summer readiness and supporting grid reliability across California.
Replacing the aging units at RSEC is a critical step in positioning Roseville Electric for a more efficient, flexible, and reliable future. The project, known as the RSEC Repower Project, will increase Roseville’s generating capacity by nearly 20 MW, from 48 MW to 67 MW. Also, the newer units are the same models as the RPEAK units located at the Roseville Energy Park (REP), so bringing them into service will help standardize Roseville’s generation fleet. And, they have hydrogen capability which will help improve Roseville’s operational flexibility in the future.
The new units are expected to be operational by summer 2026.