Hydroelectric power plants in Illinois
4 operating hydroelectric power plants in Illinois with 15 MW of hydroelectric capacity, largest first. From EIA-860M, August 2026.
Plants
4
Hydroelectric capacity
15 MW
Net generation, 2025
46.1 GWh
Largest hydroelectric power plants in Illinois
| # | Plant | Hydroelectric MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | City of Peru Hydro-Electric Generating SLasalle County | 7.6 | 17.2 | 25.9% |
| 2 | Dayton HydroLaSalle County | 3.6 | 9.9 | 31.3% |
| 3 | Dixon Hydroelectric DamLee County | 3.0 | 12.5 | 47.7% |
| 4 | RocktonWinnebago County | 1.1 | 6.5 | 67.1% |
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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