Potomac Energy Center, LLC
Natural gas power plant in Loudoun County, Virginia. 812 MW of nameplate capacity across 3 generators, operated by Potomac Energy Center LLC.
Also known as Panda Stonewall (Potomac Energy) Power Plant · EIA plant 59004
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Key facts
- Capacity
- 812 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- April 2017First generator online
- Operator
- Potomac Energy Center LLCEIA operator ID 64709
- Grid
- PJMBalancing authority PJM
- Price nodes
- 3 PJM nodesResource nodes with prices
- Location
- Loudoun County, VA39.0581, −77.5450
- EIA plant ID
- 59004EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Potomac Energy Center produces
Free · EIA-923Net generation, 2025
4.74 TWh
4,742,336 MWh, final
Capacity factor, 2025
66.7%
2024: 67.8%
January to July 2026
2.50 TWh
Provisional
Range, 2018 to 2025
3.5–5.1
TWh a year. Low 2022, high 2021
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | 3,291,609 | Not reported | 9 of 12 |
| 2018 | 4,868,251 | 68.4% | 12 of 12 |
| 2019 | 3,957,679 | 55.6% | 12 of 12 |
| 2020 | 4,951,542 | 69.4% | 12 of 12 |
| 2021 | 5,060,915 | 71.1% | 12 of 12 |
| 2022 | 3,500,284 | 49.2% | 12 of 12 |
| 2023 | 4,430,148 | 62.3% | 12 of 12 |
| 2024 | 4,833,190 | 67.8% | 12 of 12 |
| 2025 | 4,742,336 | 66.7% | 12 of 12 |
| 2026 (provisional, partial year) | 2,502,010 | 60.6% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · PJMEmissions
Free · EPA CAMPDCO₂, 2025
1.90M
US short tons. 2024: 1.94M
SO₂, 2025
2
US short tons
NOx, 2025
71
US short tons
CO₂ per MWh, calculated
0.40 t
About 803 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (CT1, CT2), matched to EIA plant 59004 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
960
million gallons
Consumption, 2024
960
million gallons
Source
Discharge
Discharge, Reclaimed. Hybrid induced-draft tower
Watershed stress
Low · 0.219
USGS SUI, HUC12 Sycolin Creek
12 of 12 cooling months report withdrawal. Reclaimed water or plant effluent; not tested. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GEN1 | Natural Gas Fired Combined Cycle | 237.0 | April 2017 |
| GEN2 | Natural Gas Fired Combined Cycle | 237.0 | April 2017 |
| GEN3 | Natural Gas Fired Combined Cycle | 338.0 | April 2017 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Potomac Energy Center LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Potomac Energy Center
How much power does Potomac Energy Center, LLC produce?
Potomac Energy Center, LLC reported 4,742,336 MWh (4.74 TWh) of net generation in 2025, a 66.7% capacity factor on 812 MW of nameplate capacity. From January to July 2026 it reported 2.50 TWh, which is provisional.
Where is Potomac Energy Center, LLC?
Potomac Energy Center, LLC is in Loudoun County, Virginia, at 39.0581, −77.5450. It is in the PJM Interconnection, LLC balancing area (PJM).
Who operates Potomac Energy Center, LLC?
EIA-860M for August 2026 lists Potomac Energy Center LLC as the operator (EIA operator ID 64709). The operator is not always the owner.
When did Potomac Energy Center, LLC start operating?
Its first generator began operating in April 2017, according to EIA-860M.
Does InfraMap have power prices for Potomac Energy Center, LLC?
Yes. InfraMap has PJM day-ahead and real-time prices at 3 price nodes linked to Potomac Energy Center, LLC, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- PJM day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page