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Guernsey Powerplant

Photo of Guernsey Powerplant
Related Projects & Facilities
Guernsey Dam
North Platte Project
Related Documents
Guernsey Powerplant Performance (pdf)
RegionFacilities in Great Plains | Great Plains Home Page
RiverNorth Platte River
PurposeThe Guernsey Dam controls river flow. Water released from Pathfinder Reservoir can be stored at this dam and released to fit varying irrigation demands. Water is released through Guernsey Powerplant.
FactsThe powerplant is on the right bank below the dam and has two 3,200-kilowatt generators. Power is transmitted to towns and industries down the valley over transmission lines. The electric power generated at Guernsey Powerplant is supplied to the project area by four substations and about 160 miles of transmission lines.
FactsGuernsey Powerplant is operated on a seasonal basis during the release of irrigation flows to satisfy downstream demands on the North Platte River in Wyoming and Nebraska.
HistoryConstruction of Guernsey Powerplant began in 1925 and was completed in 1928. The original installed capacity of the plant was 4,800 kilowatts. The plant was uprated between 1992 and 1994 through replacement of the generator windings to its current installed capacity of 6,400 kilowatts.
Present ActivitiesAn emergency contract was awarded and completed in FY 2003 for stabilization of rock on the hillside above the powerplant and transformer deck to prevent a potentially catastrophic rockslide that might have damaged the powerplant and transformers and resulted in an oil spill into the North Platte River.
Future Planned ActivitiesA replacement wicket gate greasing system was designed in FY 2004 and the new system will be installed in FY 2005.
Special IssuesUnits were rewound, new excitation equipment was installed, and major overhaul of both turbines occurred in calendar years 1993 and 1994, which accounts for high production costs in FY-1994.
Special IssuesThe switchyard at Guernsey was removed and replaced by Western Limestone substation in 1980 and 1981.
NERC RegionWestern Electricity Coordinating Council, Rocky Mountain Power Area
PMA Service AreaWestern Area Power Administration, Rocky Mountain Region
Plant TypeConventional
Powerhouse TypeAbove Ground
Turbine TypeFrancis
Original Nameplate Capacity4,800 kW
Installed Capacity6,400 kW
Year of Initial Operation1927
Age86 years
Net Generation14,374,546 kWh
(Fiscal Year)2007
Rated Head70 ft
Plant Factor26.1 percent
(Fiscal Year)2007
Production ModeIntermediate
Remotely OperatedYes
Project AuthorizationThe Secretary of the Interior authorized the project on March 14, 1903. The President approved the Guernsey Dam and Powerplant on April 30, 1925 as a part of the North Platte Project, which was originally called the Sweetwater Project.
Project PurposeThe North Platte Project provides full service irrigation for about 226,000 acres. The North Platte River, fed by many mountain streams rising in the Rocky Mountains of Colorado and Wyoming, is the most important river in southeastern Wyoming and western Nebraska. Its waters are stored and used for irrigation and power development.
TitleFacility Manager
OrganizationNorth Platte Projects Field Office
Address22122 Kortes Road
CityAlcova, WY 82620
Phone (Office)307-261-5960

Last updated: Jun 06, 2013