Marseilles Lock and Dam HydroUnder construction
LaSalle County, Illinois · EIA plant ID 58903 · Operator: Marseilles Land and Water Company
10 MW under construction (Conventional Hydroelectric), first expected Dec 2027 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 10 MW building
Net generation—GWh12 mo
Capacity factor—no 923 generation in the last 12 months
Heat rate—thermal plants only
First online—
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| UNIT1 | Conventional Hydroelectric | HY | 2.6 | 2.6 | planned Dec 2027 | Under construction | — | coming soon |
| UNIT2 | Conventional Hydroelectric | HY | 2.6 | 2.6 | planned Dec 2027 | Under construction | — | coming soon |
| UNIT3 | Conventional Hydroelectric | HY | 2.6 | 2.6 | planned Dec 2027 | Under construction | — | coming soon |
| UNIT4 | Conventional Hydroelectric | HY | 2.6 | 2.6 | planned Dec 2027 | Under construction | — | coming soon |
Owner / operator
Operator: Marseilles Land and Water Company. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| SV CSG Ottawa 1 | — | 6.5 km |
| LaSalle Generating Station | 2,340 MW | 9.5 km |
| NL IL Old Stage | — | 9.7 km |
| Dayton Hydro | 4 MW | 10 km |
| Grand Ridge Wind Energy Center | 210 MW | 11.3 km |
| Grand Ridge Battery Projects | 36 MW | 11.3 km |