Double Back Diamond
Sangamon County, Illinois · EIA plant ID 66624 · Operator: Double Back Diamond Solar Power, LLC
Nameplate593MWSummer 593 MW
Generators1in service
Net generation1,055GWh12 mo to Aug 2026
Capacity factor20%solar units, summer MW
Heat rate—thermal plants only
First online2024
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) |
|---|---|---|---|
| 2024 | 417.6 | 48.1% | — |
| 2025 | 914.9 | 17.6% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| DBD | Solar Photovoltaic | PV | 592.8 | 592.8 | Nov 2024 | Operating | — | coming soon |
Owner / operator
Operator: Double Back Diamond Solar Power, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Double Back Diamond Solar Power, LLC | 100.0% | 593 MW |
Nearby plants
Within 80 km.
| Paris Solar, LLC (CSG) | 5 MW | 6 km |
| Lotus Wind | 200 MW | 11.2 km |
| Lincoln Land Energy Center | — | 20.2 km |
| USS Solar Brick | 2 MW | 20.9 km |
| Viking Solar CSG | 2 MW | 21.7 km |
| Kincaid Generation LLC | 1,319 MW | 27.5 km |