Hydroelectric power plants in Iowa

4 operating hydroelectric power plants in Iowa with 183 MW of hydroelectric capacity, largest first. From EIA-860M, August 2026.

Plants

Hydroelectric capacity

183 MW

Net generation, 2025

1.15 TWh

Largest

Keokuk

125 MW

Largest hydroelectric power plants in Iowa

#	Plant	Hydroelectric MW	2025 net generation, GWhGWh, 2025	Capacity factor	Operator
1	KeokukLee County	125	962	88.0%	Union Electric Co - (MO)
2	Red Rock Hydro PlantMarion County	55	179	37.1%	Western Minnesota Mun Pwr Agny
3	Ottumwa City ofWapello County	2.2	2.9	10.2%	City of Ottumwa - (IA)
4	Iowa Hydro LLCJackson County	1.2	5.8	55.3%	Zero6 Energy Hydro

Projects where hydroelectric is the largest fuel or at least a fifth of nameplate capacity. MW is hydroelectric nameplate only; net generation covers the whole project. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources

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All plants in Iowa Largest hydroelectric power plants in the US