Costen Solar
Worcester County, Maryland · EIA plant ID 69306 · Operator: Costen Solar LLC
Nameplate9MWSummer 9 MW
Generators1in service
Net generation17GWh12 mo to Dec 2025
Capacity factor22%solar units, summer MW
Heat rate—thermal plants only
First online2024
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) |
|---|---|---|---|
| 2025 | 17 | 22.1% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| COSTN | Solar Photovoltaic | PV | 8.8 | 8.8 | Aug 2024 | Operating | — | coming soon |
Owner / operator
Operator: Costen Solar LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Costen Solar LLC | 100.0% | 9 MW |
Nearby plants
Within 80 km.
| UMMS at Pocomoke | 3 MW | 0 km |
| Eastern Correctional Institute | 6 MW | 10.6 km |
| Great Bay Solar 1 | 118 MW | 11 km |
| UMES (MD) - Princess Anne | 2 MW | 13 km |
| Commonwealth Chesapeake | 415 MW | 13.6 km |
| Eastern Shore Solar, LLC | 80 MW | 17.5 km |