Mainely Solar (Wyman Hill Solar LLC)
Oxford County, Maine · EIA plant ID 67402 · Operator: Wyman Hill Solar, LLC
Nameplate4MWSummer 4 MW
Generators1in service
Net generation6GWh12 mo to Dec 2025
Capacity factor17%solar units, summer MW
Heat rate—thermal plants only
First online2022
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) |
|---|---|---|---|
| 2023 | 3.9 | 11.2% | — |
| 2024 | 4.8 | 13.6% | — |
| 2025 | 5.8 | 16.7% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| P5815 | Solar Photovoltaic | PV | 4 | 4 | Dec 2022 | Operating | — | coming soon |
Owner / operator
Operator: Wyman Hill Solar, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Wyman Hill Solar, LLC | 100.0% | 4 MW |
Nearby plants
Within 80 km.
| Rumford Power LLC | 275 MW | 1.4 km |
| Rumford ESS | 5 MW | 1.6 km |
| Mead Rumford Cogen | retired | 3.8 km |
| Rumford Cogeneration | 103 MW | 4.2 km |
| Rumford Falls Hydro Facility | 53 MW | 9.4 km |
| Spruce Mountain WInd | 20 MW | 11.8 km |