# Armstrong

PJM Natural Gas Fired Combustion Turbine · https://askthegrid.com/assets/facilities/armstrong

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.
SBEND 18kv-ct1 through SBEND 18kv-ct4 · 526 kV · West Penn Power Company.

## Key facts

- Technology: Natural Gas Fired Combustion Turbine
- Power capacity: 688 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: PJM
- Balancing authority: PJM Interconnection, LLC (PJM)

## Source-backed facts

- Owner logo domain: lspower.com — Sheet1 · confidence: medium
- Owner logo domain: lspower.com — LS Power to Acquire 1,279 MW Power Generation Portfolio in PJM - LS Power · confidence: medium
- Parties: [{"relationship":"Operator / utility of record","name":"Armstrong Power LLC","official_url":null},{"relationship":"Parent owner / operating company","name":"LS Power","official_url":"https://www.lspower.com/"}] — LS Power to Acquire 1,279 MW Power Generation Portfolio in PJM - LS Power · confidence: medium
- Parties.1: {"relationship":"Parent owner / operating company","name":"LS Power","official_url":"https://www.lspower.com/"} — LS Power to Acquire 1,279 MW Power Generation Portfolio in PJM - LS Power · confidence: medium
- Product url: https://www.gevernova.com/gas-power/products/gas-turbines/7f — 7F Heavy Duty Gas Turbine | 7F.04/7F.05 | GE Vernova · confidence: medium
- Product url: https://www.gevernova.com/gas-power/products/gas-turbines/7f — C175-16 (60 HZ) | 2500-3100 kW Diesel Generator | Cat | Caterpillar · confidence: medium
- Kind: thermal — LS Power to Acquire 1,279 MW Power Generation Portfolio in PJM - LS Power · confidence: high
- Significance: Armstrong is a four-unit, natural-gas-fired simple-cycle peaking facility serving the PJM market, with 688 MW of EIA-reported nameplate capacity. LS Power identified it as one of two facilities in its 1,279 MW 2017 PJM acquisition from Dynegy. — LS Power to Acquire 1,279 MW Power Generation Portfolio in PJM - LS Power · confidence: medium
- Description: Armstrong is an operating natural-gas power plant in Shelocta, Armstrong County, Pennsylvania, consisting of four combustion-turbine generators. The plant began commercial operation in May 2002 and is operated through Armstrong Power LLC. Dynegy sold Armstrong and Troy Energy to an LS Power affiliate in July 2017 for an aggregate $480 million. NRG completed its acquisition of the LS Power generation portfolio, which included Armstrong Power LLC, on January 30, 2026. — Power plant profile: Armstrong Power Plant, US · confidence: medium
- Timeline.0: {"event":"Commercial operation","date":"2002-05","detail":"Armstrong was commissioned and began operation in May 2002. The facility comprises four 172 MW-class GE 7F.04 gas turbines, according to the plant profile and operating record."} — Power plant profile: Armstrong Power Plant, US · confidence: medium
- Timeline.3: {"event":"Operations and maintenance arrangement","date":"2017","detail":"IHI Power Services was identified as the operations and maintenance contractor, with its contract commencing in 2017 for a five-year term."} — Power plant profile: Armstrong Power Plant, US · confidence: medium
- Commercial parties.3: {"relationship":"2017 acquiring parent and former owner","name":"LS Power","detail":"LS Power Equity Advisors announced and completed the acquisition of Armstrong as part of its 1,279 MW PJM portfolio from Dynegy, and subsequently held the asset before the NRG transaction.","official_url":"https://www.lspower.com/"} — LS Power to Acquire 1,279 MW Power Generation Portfolio in PJM - LS Power · confidence: medium
- Commercial parties.3: {"relationship":"2017 acquiring parent and former owner","name":"LS Power","detail":"LS Power Equity Advisors announced and completed the acquisition of Armstrong as part of its 1,279 MW PJM portfolio from Dynegy, and subsequently held the asset before the NRG transaction.","official_url":"https://www.lspower.com/"} — LS Power: Home · confidence: medium
- Commercial parties.4: {"relationship":"Current portfolio acquirer","name":"NRG Energy, Inc.","detail":"NRG completed the acquisition of the LS Power generation portfolio on January 30, 2026; the transaction materials list Armstrong Power LLC in Shelocta among the acquired generation facilities.","official_url":"https://www.nrg.com/"} — Welcome to NRG · confidence: medium
- Acquisition detail: Dynegy finalized the sale of the Armstrong Energy Facility in Shelocta, Pennsylvania to LS Power as part of a combined $480 million transaction that also included the Troy Energy Facility. — Dynegy Sells Two Energy Units, Agrees to Sell Three More · confidence: medium
- Seller: Dynegy — Dynegy Sells Two Energy Units, Agrees to Sell Three More · confidence: medium
- Prior owner: Dynegy — Dynegy Sells Two Energy Units, Agrees to Sell Three More · confidence: medium
- Acquirer: LS Power — Dynegy Sells Two Energy Units, Agrees to Sell Three More · confidence: medium
- Transaction scope: portfolio_includes_asset — Dynegy Sells Two Energy Units, Agrees to Sell Three More · confidence: high

## Timeline

- 2026-01 — Acquisition closed
  NRG completed acquisition of LS Power portfolio including Armstrong Power LLC. Preliminary total consideration: $10.579 billion comprising $6.851 billion cash (including adjustments) and $3.728 billion stock consideration. No Armstrong-specific allocation disclosed.
  Source: Form 8-K/A for NRG Energy INC filed 02/02/2026 (https://investors.nrg.com/static-files/4335d901-1657-4223-9f7e-b6be97b7bb71)

## Sources

- [Sheet1](https://www.ferc.gov/sites/default/files/2025-02/FERC%20CID%20Listing%202-4-2025.xlsx) — ferc.gov · tier regulatory
- [LS Power to Acquire 1,279 MW Power Generation Portfolio in PJM - LS Power](https://www.lspower.com/news/ls-power-agrees-acquire-1279-mw-power-generation-portfolio-dynegy/) — lspower.com · tier other
- [Sheet1](https://www.pjm.com/-/media/DotCom/markets-ops/energy/day-ahead/valid-bidding-locations-for-virtual-bids.xls) — pjm.com · tier other
- [LS Power Submits Proposal to Add New Generation Supply Across PJM - LS Power](https://www.lspower.com/news/ls-power-submits-proposal-to-add-new-generation-supply-across-pjm/) — lspower.com · tier other
- [Source](https://www.ccj-online.com/wp-content/uploads/2021/12/CCJ-ISSUE-50-PDF.pdf) — ccj-online.com · tier other
- [1534781[03-00975]_Issued_v1.pdf](https://files.dep.state.pa.us/air/AirQuality/AQPortalFiles/Permits/PermitDocuments/1534781%5B03-00975%5D_Issued_v1.pdf) — files.dep.state.pa.us · tier other
- [1534781[03-00975]_Issued_v1.pdf](https://files.dep.state.pa.us/air/AirQuality/AQPortalFiles/Permits/PermitDocuments/1534781[03-00975]_Issued_v1.pdf) — files.dep.state.pa.us · tier other
- [7F Heavy Duty Gas Turbine | 7F.04/7F.05 | GE Vernova](https://www.gevernova.com/gas-power/products/gas-turbines/7f) — gevernova.com · tier other
- [C175-16 (60 HZ) | 2500-3100 kW Diesel Generator | Cat | Caterpillar](https://www.cat.com/en_US/products/new/power-systems/electric-power/diesel-generator-sets/1000028916.html) — cat.com · tier other
- [Power plant profile: Armstrong Power Plant, US](https://www.power-technology.com/data-insights/power-plant-profile-armstrong-power-plant-us/) — power-technology.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/1379895/000110465917012545/a17-7058_3ex2d1.htm) — sec.gov · tier regulatory
- [Form 8-K/A for NRG Energy INC filed 02/02/2026](https://investors.nrg.com/static-files/4335d901-1657-4223-9f7e-b6be97b7bb71) — investors.nrg.com · tier other
- [LS Power: Home](https://www.lspower.com/) — lspower.com · tier other
- [Welcome to NRG](https://www.nrg.com/) — nrg.com · tier other
- [Dynegy Sells Two Energy Units, Agrees to Sell Three More](https://www.power-eng.com/gas/dynegy-sells-two-energy-units-agrees-to-sell-three-more/) — power-eng.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/1379895/000110465917011289/a17-7058_1ex99d1.htm) — sec.gov · tier regulatory

## Data quality

- Capacity figures vary by reporting basis: LS Power described Armstrong as 639 MW in 2017, the EIA-derived operating record reports 688 MW of nameplate capacity, and NRG's 2026 filing lists Armstrong Power LLC at 780 MW. The disclosed NRG financing amounts are portfolio-level acquisition financing rather than Armstrong-specific project financing. The operating record marks Generator 1 as having no completed uprate or derate; no separate expansion, retirement, or repowering milestone is reflected in the cited records. Construction cost and original project-financing amounts are not disclosed.

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