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 Hydropower at Fort Peck

Hydropower production at Fort Peck was approved by the Fort Peck Power Act in 1938. Started in 1941, construction on the first power house was not completed until 1951 due to shortages of supplies and materials during World War II.

A second power house was later added to tunnel #2. Construction on it began in 1958 and was completed in 1961. Today the two power houses average 1.1 billion kilowatt hours a year, or enough power to supply a town of 100,000 people.

 Characteristics and Value

Characteristics and Value


5 Francis Turbines, 129 rpm

Nameplate Capacity

185.3 MW

· units 1 & 3: 43.5 MW each

· unit 2: 18.3 MW

· units 4 & 5: 40 MW each

Percent of NWO Capacity


Average Gross Head Available

194 ft

Number & Size of Conduits

No. 1-24.8’ dia, No.2-22.4’ dia

Surge Tanks

PH #1: 3-40’ dia

PH #2: 2-65’ dia

Discharge Capacity

PH #1: units 1 & 3- 170’, unit 2-140’ at 8,800 cfs

PH #2: units 4 & 5 -170’ at 7,200 cfs

Average Annual Energy

1,048 M kWh

Hydropower Master Plan

The Omaha District has prepared a Hydropower Master Plan outlining the future requirements for sustaining our hydropower mission capability. A strategic master plan will guide future programming and funding for all hydropower sustainment, rehabilitation, and modernization requirements in a way that provides predictable funding and maximizes efficiencies to ensure the long-term resilience and reliability of this critical national infrastructure.

Hydropower Master Plan Book Cover