Power plants operated by USACE Northwestern Division

USACE Northwestern Division operates 21 power plants in the 2025 EIA-860 data, with 13.1 GW of nameplate capacity, the 14th-largest fleet among the 5,826 operators on file. They are spread over four states: Oregon, Washington, Idaho and Montana. Hydroelectric is 100% of the capacity; the largest site is Chief Joseph. Its oldest working unit dates from 1938, at Bonneville.

Hydroelectric13,111 MW100%

Capacity by decade it came online

Hydroelectric

Above the line: capacity operating in 2025. Below: capacity retired at these plants.

Plants

Plant	State	Runs on	Capacity	First unit
Chief Joseph	Washington	Hydroelectric	2,456 MW	1955
John Day	Oregon	Hydroelectric	2,160 MW	1968
The Dalles	Oregon	Hydroelectric	1,820 MW	1957
Bonneville	Oregon	Hydroelectric	1,162 MW	1938
McNary	Oregon	Hydroelectric	990 MW	1953
Little Goose	Washington	Hydroelectric	810 MW	1970
Lower Granite	Washington	Hydroelectric	810 MW	1975
Lower Monumental	Washington	Hydroelectric	810 MW	1969
Ice Harbor	Washington	Hydroelectric	603 MW	1962
Libby	Montana	Hydroelectric	525 MW	1975
Dworshak	Idaho	Hydroelectric	465 MW	1974
Lookout Point	Oregon	Hydroelectric	120 MW	1955
Detroit	Oregon	Hydroelectric	100 MW	1953
Green Peter	Oregon	Hydroelectric	80 MW	1967
Lost Creek	Oregon	Hydroelectric	49 MW	1977
Albeni Falls	Idaho	Hydroelectric	42 MW	1955
Hills Creek	Oregon	Hydroelectric	30 MW	1962
Cougar	Oregon	Hydroelectric	26 MW	1964
Foster	Oregon	Hydroelectric	20 MW	1968
Big Cliff	Oregon	Hydroelectric	18 MW	1954
Dexter	Oregon	Hydroelectric	15 MW	1955