Stonewall
Loudoun County, Virginia · EIA plant ID 59004 · Operator: potomac energy center llc
Nameplate812MWSummer 766 MW
Generators3in service
Net generation4,706GWh12 mo to Aug 2026
Capacity factor70%gas/coal/oil units, summer MW
Heat rate7,037Btu/kWhfossil units, electric fuel, HHV
First online2017Runs as baseload
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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), gas/coal/oil 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2017 | 3,291.6 | 65.1% | 7,048 |
| 2018 | 4,868.3 | 72.5% | 6,876 |
| 2019 | 3,957.7 | 59.0% | 7,164 |
| 2020 | 4,951.5 | 73.6% | 7,007 |
| 2021 | 5,060.9 | 75.4% | 7,114 |
| 2022 | 3,500.3 | 52.2% | 7,180 |
| 2023 | 4,430.1 | 66.0% | 7,054 |
| 2024 | 4,833.2 | 71.8% | 6,822 |
| 2025 | 4,742.3 | 70.7% | 6,953 |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Natural Gas Fired Combined Cycle | CT | 237 | 220 | Apr 2017 | Operating | — | coming soon |
| GEN2 | Natural Gas Fired Combined Cycle | CT | 237 | 220 | Apr 2017 | Operating | — | coming soon |
| GEN3 | Natural Gas Fired Combined Cycle | CA | 338 | 326 | Apr 2017 | Operating | — | coming soon |
Owner / operator
Operator: potomac energy center llc. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| potomac energy center llc | 100.0% | 812 MW |
Nearby plants
Within 80 km.
| Evergreen Energy Center, LLC | — | 3.5 km |
| Dulles Solar and Storage | — | 12.6 km |
| Montgomery County Resource Recovery | 68 MW | 17.6 km |
| Dickerson | 326 MW | 18.2 km |
| Dickerson | retired | 18.2 km |
| Reston Town Center Solar 1 | 1 MW | 19.5 km |