Marlowe Solar
Berkeley County, West Virginia · EIA plant ID 66899 · Operator: Monongahela Power Co
Nameplate6MWSummer 6 MW
Generators1in service
Net generation8GWh12 mo to Dec 2025
Capacity factor20%solar units, summer MW
Heat rate—thermal plants only
First online2025
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 | 7.8 | 20.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| MARS | Solar Photovoltaic | PV | 5.8 | 5.8 | Apr 2025 | Operating | — | coming soon |
Owner / operator
Operator: Monongahela Power Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Monongahela Power Co | 100.0% | 6 MW |
Nearby plants
Within 80 km.
| Spruce - WCMD - Rubble I | 2 MW | 3.4 km |
| Spruce - WCMD - Rubble II | 2 MW | 3.7 km |
| Pinesburg Solar LLC | 4 MW | 4.5 km |
| Downsville II | — | 4.8 km |
| Rockdale | 2 MW | 5.5 km |
| FedEx Hagerstown | 2 MW | 6.6 km |