Hydroelectric power plants in South Dakota

4 operating hydroelectric power plants in South Dakota with 1,608 MW of hydroelectric capacity, largest first. From EIA-860M, August 2026.

Plants

Hydroelectric capacity

1,608 MW

Net generation, 2025

4.19 TWh

Largest

Oahe

786 MW

Largest hydroelectric power plants in South Dakota

#	Plant	Hydroelectric MW	2025 net generation, GWhGWh, 2025	Capacity factor	Operator
1	OaheHughes County	786	2,014	29.2%	USACE-Omaha
2	Big Bend DamBuffalo County	538	746	15.8%	USACE-Omaha
3	Fort RandallCharles Mix County	280	1,417	50.5%	USACE-Omaha
4	Spearfish HydroLawrence County	4.0	18.4	52.5%	City of Spearfish - (SD)

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 South Dakota Largest hydroelectric power plants in the US