How big is Potomac Energy Center, LLC?

Potomac Energy Center, LLC has a reported capacity of 812 MW. Source: EIA Form 860.

What kind of plant is Potomac Energy Center, LLC?

Potomac Energy Center, LLC is a Natural Gas Fired Combined Cycle facility in Loudoun County, VA, participating in the PJM market.

Where is Potomac Energy Center, LLC located?

Potomac Energy Center, LLC is in Loudoun County, VA, inside the PJM balancing area.

Who operates Potomac Energy Center, LLC?

Potomac Energy Center, LLC is operated by Potomac Energy Center LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Potomac Energy Center, LLC generate?

Potomac Energy Center, LLC reported 4,752.5 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

How does Potomac Energy Center, LLC compare to other plants?

By capacity, Potomac Energy Center, LLC ranks #140 of 538 operating plants of the same technology nationally. It ranks #5 of 11 in VA.

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Natural Gas Fired Combined CyclePJM · Loudoun County

Potomac Energy Center, LLC

Loudoun County · PJM

Potomac Energy Center, LLC is a natural gas-fired power facility with 812 MW of EIA-reported nameplate capacity in Loudoun County, Virginia, registered as EIA Plant ID 59004. The plant's generating configuration is natural-gas-fired combined-cycle plant with 3 operating generators and two Siemens SGT6-5000F combustion turbines. Blackstone Energy Transition Partners acquired the project from Ares Management in 2025.

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Asset analyst

plant:plant-59004

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Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Overview

Key fields

Reported capacity: 812 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combined Cycle
Primary generation technology.
Registry anchor: Plant 59004
Loudoun County · PJM
Operating status: Operating

Infrastructure record

Operator: Potomac Energy Center LLC

Profile

Grid role: Baseload combined-cycle generation resource in the PJM-DOM supply stack.
Physical build: Potomac Energy Center is the former Panda Stonewall Energy Facility, a natural-gas-fired combined-cycle plant. Bechtel, in consortium with Siemens Energy, provided project management, engineering, procurement, construction, startup and commissioning. The installed power-island scope comprises two SGT6-5000F gas turbines, one SST6-5000 steam turbine with one SCon-4000 condenser, two SGen6-1000A generators, one SGen6-2000H generator, two NEM duct-fired heat-recovery steam generators, the complete electrical system, and SPPA-T3000 instrumentation and control.

Structured profile

Reported capacity: 812 MW
Natural Gas Fired Combined Cycle
Operating status: operating
Potomac Energy Center, LLC is operating.
Location: Loudoun County
PJM
Asset role: natural gas
PJM · Loudoun County

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
GEN1	237 MW 220 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Apr 2017	Operating
GEN2	237 MW 220 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Apr 2017	Operating
GEN3	338 MW 326 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CA	Apr 2017	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 812 MW
National rank: #140
VA rank: #5

Monthly generation

Download CSV

Latest 12 months

4.75 TWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

66.7%

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Nearby substations

HIFLD infrastructure inventory

STONEWALL ENERGY CENTER

IN SERVICE · 230 kV

0.4 km

TAP161085

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Transactions and agreements

PPA Approval And Offtake Arrangement

Mar 9, 2026

American Municipal Power entered into the Potomac Energy Center PPA with Potomac Energy Center, LLC. AMP will purchase and the seller will supply approximately 268 MW of base capacity plus a pro-rata share of 32 MW of duct-firing capacity and associated energy for 15 years. AMP materials describe deliveries beginning June 1, 2026 and continuing through May 31, 2041.

268 MW contracted15 yearsAmerican Municipal Power, Inc. · Potomac Energy Center, LLC

Source

Municipal PPA Schedule Authorization

Mar 9, 2026

The Town of Front Royal authorized a Potomac Energy Center schedule with American Municipal Power under the AMP master-services structure. The town could acquire up to 3 MW of capacity and associated energy through the Potomac Energy Center PPA for a 15-year period.

3 MW contracted15 yearsTown of Front Royal, Virginia · American Municipal Power, Inc. · Potomac Energy Center, LLC

Source

Land and environmental record

County Appraisal And Parcel Identifier

2026

Loudoun County parcel PARID 193389504000

The county appraisal record identifies Potomac Energy Center, LLC as owner of the parcel at 20260 Energy Park Drive, Leesburg, Virginia; tax map is /61//16///A-2/.

Loudoun County

Historical Air-Permitting Milestone

Dec 18, 2020

Historical PSD/NSR construction permit registration 73826; facility ID 51-107-01019

A Virginia permit amendment dated December 18, 2020 covered construction and operation of the electric power generation facility and stated that the facility was subject to PSD, nonattainment new-source-review, and stationary-source construction and operating requirements.

Source

Parcel Acreage And Public Landowner

2026

87.01 acres

Loudoun County parcel PARID 193389504000 is owned by Potomac Energy Center, LLC, with primary address 20260 Energy Park Drive. The county record identifies the legal description as Stonewall Energy Park Parcel A-2 and the land use as vacant land.

Loudoun County

Permitted Facility Description

Apr 1, 2024

802 MW nominal net combined-cycle generating facility

The 2024 Virginia Title V permit describes the facility as a nominal 802 MW net fossil-fuel combined-cycle electrical generating facility. The permit lists two Siemens SGT6-5000F5 natural-gas combustion turbines, two HRSG duct burners, an auxiliary boiler, a fuel-gas heater, and an emergency diesel generator.

73826 Title V Permit

Permitted Fuel

Dec 18, 2020

Natural gas-only firing for the combined-cycle units, HRSG duct burners, auxiliary boiler, and fuel-gas heater

The Virginia construction permit specifies pipeline natural gas as the approved fuel for CT1, CT2, DB1, DB2, the auxiliary boiler, and the fuel-gas heater, with maximum total sulfur content of 0.1 grains per 100 standard cubic feet unless DEQ approves a change.

Source

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

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AssetOwner / operatorContractorOfftakerOrganization

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Jul 2014
Jul 2014
Construction site work beganBechtel, Pa...
Panda began site work at the Stonewall facility in mid-July 2014.
Apr 2017

Potomac Energy Center, LLC

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Potomac Energy Center, LLC

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Overview

Key fields

Infrastructure record

Profile

Structured profile

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Transactions and agreements

Land and environmental record

Related parties and identifiers

Relationship graph

Timeline and sources

Project timeline

Parties and identifiers

Reporting portfolio

Sources

Common questions about Potomac Energy Center, LLC

How big is Potomac Energy Center, LLC?

What kind of plant is Potomac Energy Center, LLC?

Where is Potomac Energy Center, LLC located?

Who operates Potomac Energy Center, LLC?

How much electricity does Potomac Energy Center, LLC generate?

How does Potomac Energy Center, LLC compare to other plants?

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