Prairie State Solar Project
Perry County, Illinois · EIA plant ID 62420 · Operator: Prairie State Power, LLC
Nameplate99MWSummer 99 MW
Generators1in service
Net generation219GWh12 mo to Aug 2026
Capacity factor25%solar units, summer MW
Heat rate—thermal plants only
First online2021
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), solar units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2021 | 94.9 | 21.7% | — |
| 2022 | 232.5 | 26.8% | — |
| 2023 | 234.2 | 27.0% | — |
| 2024 | 234.1 | 26.9% | — |
| 2025 | 220.4 | 25.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| PSS01 | Solar Photovoltaic | PV | 99 | 99 | Jul 2021 | Operating | — | coming soon |
Owner / operator
Operator: Prairie State Power, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Prairie State Power, LLC | 100.0% | 99 MW |
Nearby plants
Within 80 km.
| Great Plains Solar, LLC | — | 4.1 km |
| Snapdragon Solar, LLC | — | 4.8 km |
| Tilden Solar | 150 MW | 9.4 km |
| Prairie State Generating Station | 1,766 MW | 11 km |
| SV CSG Wagner A LLC | 2 MW | 12 km |
| Two Blues Solar, LLC | — | 19 km |