Stephenson County IL S1Under construction
Stephenson County, Illinois · EIA plant ID 70393 · Operator: SolAmerica Energy / Stephenson County IL S1, LLC
2 MW under construction (Solar Photovoltaic), first expected Oct 2026 · EIA-860M
Nameplate—MWSummer — MW
Generators0in service · 2 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 |
|---|---|---|---|---|---|---|---|---|
| S1 | Solar Photovoltaic | PV | 2 | 2 | planned Oct 2026 | Under construction | — | coming soon |
Owner / operator
Operator: SolAmerica Energy / Stephenson County IL S1, LLC. 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.
| Pretzel CSG | 2 MW | 1.5 km |
| Freeport 18th Solar | 2 MW | 1.9 km |
| Trinity Freeport | 2 MW | 3.7 km |
| IL - Ameresco - Freeport North | 3 MW | 5.4 km |
| IL - Ameresco - Freeport South | 4 MW | 5.7 km |
| 2662 Freeport Solar 1 CSG | 2 MW | 5.9 km |