How big is Armstrong?

Armstrong has a reported capacity of 688 MW. Source: EIA Form 860.

What kind of plant is Armstrong?

Armstrong is a Natural Gas Fired Combustion Turbine facility in Armstrong County, PA, participating in the PJM market.

Where is Armstrong located?

Armstrong is in Armstrong County, PA, inside the PJM balancing area.

Who operates Armstrong?

Armstrong is operated by Armstrong Power LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Armstrong generate?

Armstrong reported 1,232.9 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

How does Armstrong compare to other plants?

By capacity, Armstrong ranks #51 of 825 operating plants of the same technology nationally. It ranks #1 of 18 in PA.

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Natural Gas Fired Combustion TurbinePJM · Armstrong County

Armstrong

NRG Energy, Inc. · Armstrong County · PJM

Armstrong is a natural gas-fired power facility with 688 MW of EIA-reported nameplate capacity in Armstrong County, Pennsylvania, registered as EIA Plant ID 55347. Armstrong Power LLC owns and operates the plant.

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Overview

Key fields

Reported capacity: 688 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combustion Turbine
Primary generation technology.
Registry anchor: Plant 55347
Armstrong Power LLC · Armstrong County · PJM
Operating status: Operating

Asset analyst

plant:plant-55347

Ask about Armstrong

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

Units and generators

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

Generator	Capacity	Technology	Operation	Status
1	172 MW 168.4 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	May 2002	Operating
2	172 MW 163.6 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	May 2002	Operating
3	172 MW 169 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	May 2002	Operating
4	172 MW 169.7 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	May 2002	Operating

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

Acquisition Agreement

Feb 2017

Dynegy agreed to sell Armstrong and Troy PJM peaking facilities totaling 1,269 MW to LS Power for $480 million ($378/kW). Amount was for combined transaction and not allocated separately to Armstrong.

$480MDynegy Inc. · LS Power Equity Advisors, LLC

news release

Capacity Payment Arrangement

Jun 1, 2015

Armstrong was receiving approximately $353,061 per month for a term commencing June 1, 2015 and ending ten years later. Amount shown is disclosed monthly payment, not total transaction value. Counterparty and contracted-capacity amount not identified in document excerpt.

$353,061.010 yearsArmstrong Power LLC

membership interest purchase agreement

Portfolio Contribution Or Acquisition

Aug 2024

Lightning Power disclosed acquisition of 100% interests in certain generation facilities on August 9, 2024, with Armstrong Power LLC identified among the acquired facilities. No Armstrong-specific consideration or seller identified.

Lightning Power LLC · Armstrong Power LLC

lightning power, llc

Land and environmental record

Air Emissions And Fuel Limits

Sep 11, 2025

Natural-gas turbine limits: 9 ppm NOx at 15% oxygen; per-unit hourly limits of 64.0 lb NOx, 31.0 lb CO, 2.8 lb SO2, 3.2 lb VOC, 18.0 lb PM10, 14.0 lb PM2.5; combined natural-gas use limited to 16.688 billion standard cubic feet per rolling 12 months

Title V permit sets natural-gas operating and emissions limits for the four turbines and requires fuel monitoring and performance testing. Permit also authorizes dual-fuel operation with low-sulfur diesel, but primary fuel is natural gas.

1534781[03-00975]_Issued_v1.pdf

Air Permit

Sep 11, 2025

Title V/State Operating Permit 03-00975; DEP Authorization ID 1534781; DEP PF ID 563216

Pennsylvania DEP issued the exact facility's Title V/State Operating Permit under permit number 03-00975, with effective date September 11, 2025 (renewal). Authorization ID 1534781 and DEP PF ID 563216 also identified.

1534781[03-00975]_Issued_v1.pdf

Facility And Permit Location

Sep 11, 2025

2313 State Route 156, Shelocta, PA 15774-3005, South Bend Township, Armstrong County

Pennsylvania DEP Title V/State Operating Permit 03-00975 identifies the plant as ARMSTRONG POWER/S BEND at 2313 State Route 156, Shelocta, PA 15774-3005, in South Bend Township, Armstrong County, with Armstrong Power LLC as responsible official.

1534781[03-00975]_Issued_v1.pdf

Fuel Storage And Waste Limitation

Sep 11, 2025

Two 2.25-million-gallon low-sulfur diesel storage tanks permitted; no solid-waste burning authorization

Permit identifies two 2.25-million-gallon diesel tanks subject to federal storage-vessel requirements. Operating permit expressly does not authorize burning solid waste. No separate exact-site waste or remediation milestone identified.

1534781[03-00975]_Issued_v1.pdf

Parcel Acreage And Identifier

39-acre parcel; parcel number 42-0-066103

Public-record property aggregator lists 2313 State Route 156, Shelocta, PA as a 39-acre parcel with parcel number 42-0-066103. Acreage and parcel identifier should be confirmed against Armstrong County assessment or deed records.

State Route 156, Shelocta, PA 15774 - House Value & Property Details

Overview

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Units and generators

Performance

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Monthly generation

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Commercial, land, and environmental record

Transactions and agreements

Land and environmental record

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Parties and identifiers

Reporting portfolio

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Sources

Common questions about Armstrong

How big is Armstrong?

What kind of plant is Armstrong?

Where is Armstrong located?

Who operates Armstrong?

How much electricity does Armstrong generate?

How does Armstrong compare to other plants?

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