Mason Solar One LLC
Cecil County, Maryland · EIA plant ID 64645 · Operator: Nautilus Solar Solutions
Nameplate1MWSummer 1 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor22%solar units, summer MW
Heat rate—thermal plants only
First online2020
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 | 2.1 | 23.9% | — |
| 2022 | 2.1 | 24.4% | — |
| 2023 | 2 | 22.5% | — |
| 2024 | 1.8 | 20.9% | — |
| 2025 | 1.9 | 21.5% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| MAS | Solar Photovoltaic | PV | 1 | 1 | Nov 2020 | Operating | — | coming soon |
Owner / operator
Operator: Nautilus Solar Solutions. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Nautilus Solar Solutions | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Meeting House | 2 MW | 2.5 km |
| MD - WL Gore - Cherry Hill | 4 MW | 5.7 km |
| Cecil County CCVT HS | 2 MW | 10.5 km |
| MD - WL Gore - Appleton | 1 MW | 11.1 km |
| 100a Swiss Dale Farm | — | 11.8 km |
| UE-00801MD, LLC | 1 MW | 11.9 km |