Upper Marlboro 1 CSG
Prince Georges County, Maryland · EIA plant ID 63075 · Operator: Nautilus Solar Solutions
Nameplate2MWSummer 2 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor13%solar units, summer MW
Heat rate—thermal plants only
First online2019
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) |
|---|---|---|---|
| 2019 | 0 | 0.1% | — |
| 2020 | 1.6 | 9.0% | — |
| 2021 | 1.8 | 10.5% | — |
| 2022 | 3.2 | 18.1% | — |
| 2023 | 2.8 | 16.1% | — |
| 2024 | 3.1 | 17.8% | — |
| 2025 | 2.3 | 13.2% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 20 | Solar Photovoltaic | PV | 2 | 2 | Dec 2019 | 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% | 2 MW |
Nearby plants
Within 80 km.
| OER Monarch CSG | 2 MW | 1.5 km |
| Brown Station Road Plant I | 3 MW | 4.6 km |
| MNCPPC Randall Farm | 1 MW | 4.7 km |
| TPE MD PR270 | 2 MW | 6.1 km |
| Brown Station Road Plant II | 4 MW | 6.6 km |
| Bluefin Origination 1 | 2 MW | 6.8 km |