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City of Roseville
Roseville Energy Park Power Plant
Docket # 03-AFC-1


The City of Roseville's electric department, doing business as Roseville Electric, proposes to construct, own, and operate an electrical generating plant in the City of Roseville, Placer County, California. The Roseville Energy Park (REP) will be a natural gas-fired, combined-cycle electrical generating facility rated at a nominal net generating capacity of 120 to 125 megawatts (MW), with the ability to peak-fire to 160 MW nominal during summer design conditions.

The project is proposed for a 12-acre site that lies within a 40-acre City of Roseville parcel. The project site is within the limits of the City of Roseville, adjacent to and north of the Pleasant Grove Waste Water Treatment Plant. The project site is owned by the City of Roseville and is zoned Public/Quasi-Public. Surrounding land uses currently include ranching (agricultural grazing) and rural residential. s

Please note: This proposed power plant is not the same as the 500 megawatt project that was known as the Roseville Energy Facility, LLC, a wholly-owned subsidiary of Enron North America Corp. That project application (docket # 01-AFC-14) was filed with the Energy Commission in August 2001 and then withdrawn by the applicant on November 19, 2002. Files for that project are not available on line because the project was withdrawn. Copies of the original Roseville Energy Facility files are available on CD-ROM by calling 916-654-4989. - Webmaster


The main project features are:

  • The project is a 120 to 125 MW nominal, natural gas-fired, combined-cycle generating plant with two General Electric LM6000 or two Alstom GTX 100 combustion turbine-generators (CTGs), a single condensing steam turbine generator (STG), a deaerating surface condenser; a four-cell mechanical draft cooling tower; and associated support equipment.

  • The CTGs are equipped with evaporative coolers on the inlet air system and water-injected combustors for the LM6000 model or dry low NOx combustors for the GTX 100 model.

  • The heat recovery steam generators (HRSGs) will be of the horizontal, natural circulation type, equipped with duct burners. The emission reduction system includes a selective catalytic reduction (SCR) unit to control nitrogen oxide (NOx) stack emissions and an oxidation catalyst to control carbon monoxide (CO) emissions.

  • A 40,000 pound-per-hour natural gas-fired auxiliary boiler and a nominal 750 kW, diesel-fired standby generator will also be included in the project.

  • A 50-foot-long pipeline will supply tertiary treated recycled waste water from the City of Roseville's adjacent PGWWTP for use as cooling tower makeup water, firewater, service water, and process makeup water.

  • Cooling tower blowdown water will be treated through a zero liquid discharge (ZLD) treatment system located on the project site. As a result, no process wastewater will be discharged from the plant. A relatively small amount of salt cake will be produced by the ZLD system for off-site disposal at an approved landfill.

  • A 60-kilovolt (kV) on-site switchyard will deliver the plant's power directly to the grid through a double-circuit 60 kV transmission line that will be located adjacent to the project site. This new line will be constructed along the current alignment of Phillip Road or an alternative road alignment as part of the West Roseville development and will be looped directly through the project switchyard.

  • Approximately 6 miles of 10- to 16-inch diameter underground natural gas pipeline will convey gas from Pacific Gas & Electric Company's (PG&E) gas distribution Line 123 to the project site. This pipeline begins at a connection point near the corner of Baseline Road and Country Club Lane.

  • Potable water will temporarily be supplied to the project site from an on-site well. The project will use potable water from the City of Roseville's distribution system when this water becomes available as part of the build-out of West Roseville's infrastructure.

  • Storm water runoff will be collected in ponds located on-site and released to an unnamed local drainage located approximately 720 feet east of the power plant fenceline through a 30-inch, storm water outfall pipeline.

  • Sanitary waste water will be piped to the PGWWTP's influent junction structure, located approximately 800 feet east of the project site.


The power plant will be owned by the City of Roseville. The City, through Roseville Electric, has been providing electrical power to its residents, businesses, and the City's street lighting system since 1912. In 1968, the City became a charter member in the Northern California Power Agency (NCPA), a consortium of municipal electrical utilities. Roseville Electric has interests in natural gas-fired, geothermal, solar, hydroelectric, and other sources of electrical generation that it uses to meet its historical annual peak demand of approximately 300 MW.

It is expected that PG&E will own and maintain the new natural gas supply pipeline that will serve the REP. Alternatively, the City of Roseville may construct the pipeline and either own and operate it, or deed it back to PG&E. RE will contract with PG&E and/or other natural gas suppliers to supply natural gas to the REP.


Page Updated: October 30, 2003