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Gem State

Hydro power plant · Bonneville County, Idaho

Nameplate capacity
23 MW
Rank in Idaho
#44
of 155 plants
In service since
1988
November 1988

Details

Primary fuel
Hydro
Technology
Conventional Hydroelectric
Operator
City of Idaho Falls - (ID)
County
Bonneville County
Generating units
1
Share of state capacity
0.36%
Rank among hydro plants in Idaho
#19 of 76
EIA plant code
790

Generating units

Individual generating units at Gem State
UnitTechnologyNameplateSummerOnlineStatus
1Conventional Hydroelectric23 MW23 MW1988Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

Similarly sized plants in Idaho

About this data

From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 23 MW solar plant and a 23 MW nuclear plant have the same entry here and produce very different amounts of electricity.

“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Idaho power plants · What Idaho actually generates