# Allegheny Energy Units 3 4 & 5

PJM Natural Gas Fired Combined Cycle · https://askthegrid.com/assets/facilities/allegheny-energy-units-3-4-and-5

Allegheny Energy Units 3 4 & 5 is a natural gas-fired power facility with 556 MW of EIA-reported nameplate capacity in Allegheny County, Pennsylvania, registered as EIA Plant ID 55710. Its grid role is high-utilization combined-cycle generation; the permit states that Units 3, 4, and 5 operate more than 80% of the year.
SPRINGDALE CC5 · 138 kV · West Penn Power Company.

## Key facts

- Technology: Natural Gas Fired Combined Cycle
- Power capacity: 556 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: PJM
- Balancing authority: PJM

## Source-backed facts

- Description: Allegheny Energy Units 3 4 & 5 is EIA plant 55710, a 556 MW natural-gas-fired combined-cycle facility in Springdale, Allegheny County, Pennsylvania. The plant is operated by Springdale Energy, LLC and is within the PJM market. FERC asset records identify the exact plant’s generators as UNT3, UNT4, and UNT5, using unit code CC1. The facility’s 2026 Allegheny County Title V permit is Permit No. 0580-OP26. — Source · confidence: medium
- Identifiers.8: {"value":"0580-OP26","system":"Allegheny County Title V operating permit"} — Source · confidence: high
- Identifiers.9: {"value":"SPRINGDALE CC5","system":"PJM market-resource / bidding-location name"} — Sheet1 · confidence: medium
- Parties.0: {"relationship":"Current owner and permittee","name":"Springdale Energy, LLC","official_url":null} — Source · confidence: high
- Construction scope: EIA plant 55710's Units 3–5 comprise a 2-on-1 natural-gas combined-cycle block: two Siemens-Westinghouse Model 501F combustion turbines, two HRSGs—one per turbine—and one axial-flow condensing steam-turbine generator. The permit identifies the gas turbines as nominally 188 MWe each and the steam turbine as 186 MWe; the project profile reports 184 MW nameplate per gas turbine and a 188 MW steam turbine. Historical reporting states construction began in July 2001 and was completed in the second week of August 2003. — Source · confidence: medium
- Construction scope: EIA plant 55710's Units 3–5 comprise a 2-on-1 natural-gas combined-cycle block: two Siemens-Westinghouse Model 501F combustion turbines, two HRSGs—one per turbine—and one axial-flow condensing steam-turbine generator. The permit identifies the gas turbines as nominally 188 MWe each and the steam turbine as 186 MWe; the project profile reports 184 MW nameplate per gas turbine and a 188 MW steam turbine. Historical reporting states construction began in July 2001 and was completed in the second week of August 2003. — Allegheny Energy Begins Commercial Startup of Pennsylvania Power... · confidence: medium
- Product url: https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium
- Kind: thermal — Source · confidence: high
- Manufacturer domain: siemens-energy.com — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium
- Product family: Siemens-Westinghouse Model 501F / W501 FD; the project profile identifies the turbine supplier's product as SGT6-5000F — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium
- Equipment models.0: {"manufacturer_domain":"siemens-energy.com","product_url":"https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html","count":2,"unit_mw":184,"name":"Siemens-Westinghouse Model 501F / W501 FD combustion turbine generator, reported in the project profile as SGT6-5000F"} — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium
- Equipment models.1: {"manufacturer_domain":"nem-energy.com","product_url":"https://nem-energy.com/products/heat-recovery-steam-generators-and-waste-heat-recovery-units/","count":2,"unit_mw":null,"name":"Vogt-NEM heat-recovery steam generator (HRSG)"} — Source · confidence: medium
- Equipment models.2: {"manufacturer_domain":"siemens-energy.com","product_url":null,"count":1,"unit_mw":186,"name":"Siemens-Westinghouse axial-flow condensing steam-turbine generator"} — Source · confidence: medium
- Quality notes: ["The 2017 sale announcements refer to the broader Springdale Generating Facility Units 1-5, reported at 638 MW initially and 623 MW in the closing portfolio announcement; those figures are not the exact EIA 55710 three-unit capacity of 556 MW.","The disclosed $825 million 2017 consideration was for a multi-asset portfolio, and no allocation to EIA plant 55710 or plant-specific project financing was disclosed.","NRG's 2026 acquisition figures are also portfolio-level. The evidence identifies Springdale Energy in the acquired generation-facilities table but does not separately state a purchase-price allocation for this plant.","The available records show the three units operating and report no completed uprate or derate; no separate retirement or repowering event was identified. A construction-start date was not disclosed; July 2003 is the reported initial-operation date."] — FirstEnergy Subsidiaries Sign Revised Agreement for Sale of Competitive Natural Gas and Hydro Assets · confidence: medium
- Financing summary: FirstEnergy's January 19, 2017 agreement contemplated an approximately $925 million all-cash sale of a multi-asset portfolio. A revised agreement signed August 30, 2017 reduced the all-cash portfolio price to $825 million; the amount was not allocated to EIA plant 55710. For NRG's January 30, 2026 acquisition of the LS Power portfolio, preliminary consideration comprised $6.4 billion in cash plus approximately $0.5 billion of working-capital and other adjustments, 24.25 million NRG common shares, and approximately $3.2 billion of assumed debt. NRG disclosed $4.357 billion of net proceeds from new unsecured and secured corporate debt and $2.494 billion drawn from its revolving credit facility as funding sources; a proposed bridge facility of up to $4.4 billion was terminated October 8, 2025 after permanent financing was obtained. These were portfolio-transaction financing arrangements, not disclosed project financing for Springdale. — FirstEnergy to Sell Competitive Natural Gas and Hydro Assets to LS Power Equity Partners · confidence: medium
- Financing summary: FirstEnergy's January 19, 2017 agreement contemplated an approximately $925 million all-cash sale of a multi-asset portfolio. A revised agreement signed August 30, 2017 reduced the all-cash portfolio price to $825 million; the amount was not allocated to EIA plant 55710. For NRG's January 30, 2026 acquisition of the LS Power portfolio, preliminary consideration comprised $6.4 billion in cash plus approximately $0.5 billion of working-capital and other adjustments, 24.25 million NRG common shares, and approximately $3.2 billion of assumed debt. NRG disclosed $4.357 billion of net proceeds from new unsecured and secured corporate debt and $2.494 billion drawn from its revolving credit facility as funding sources; a proposed bridge facility of up to $4.4 billion was terminated October 8, 2025 after permanent financing was obtained. These were portfolio-transaction financing arrangements, not disclosed project financing for Springdale. — FirstEnergy Subsidiaries Sign Revised Agreement for Sale of Competitive Natural Gas and Hydro Assets · confidence: medium
- Financing summary: FirstEnergy's January 19, 2017 agreement contemplated an approximately $925 million all-cash sale of a multi-asset portfolio. A revised agreement signed August 30, 2017 reduced the all-cash portfolio price to $825 million; the amount was not allocated to EIA plant 55710. For NRG's January 30, 2026 acquisition of the LS Power portfolio, preliminary consideration comprised $6.4 billion in cash plus approximately $0.5 billion of working-capital and other adjustments, 24.25 million NRG common shares, and approximately $3.2 billion of assumed debt. NRG disclosed $4.357 billion of net proceeds from new unsecured and secured corporate debt and $2.494 billion drawn from its revolving credit facility as funding sources; a proposed bridge facility of up to $4.4 billion was terminated October 8, 2025 after permanent financing was obtained. These were portfolio-transaction financing arrangements, not disclosed project financing for Springdale. — Form 8-K/A for NRG Energy INC filed 02/02/2026 · confidence: medium
- Timeline.1: {"event":"Original sale agreement announced","date":"2017-01-19","detail":"FirstEnergy announced an agreement to sell the broader Springdale Generating Facility Units 1-5, along with other generation assets, to LS Power Equity Partners for approximately $925 million in an all-cash portfolio transaction."} — FirstEnergy to Sell Competitive Natural Gas and Hydro Assets to LS Power Equity Partners · confidence: medium
- Timeline.2: {"event":"Revised sale agreement","date":"2017-08-30","detail":"FirstEnergy subsidiaries signed a revised agreement with an all-cash price of $825 million for the multi-asset portfolio, including Springdale Generating Facility Units 1-5."} — FirstEnergy Subsidiaries Sign Revised Agreement for Sale of Competitive Natural Gas and Hydro Assets · confidence: medium
- Timeline.5: {"event":"Permanent acquisition financing","date":"2025-10-08","detail":"NRG terminated its proposed $4.4 billion senior secured bridge facility after obtaining permanent financing for the LS Power portfolio acquisition."} — Form 8-K/A for NRG Energy INC filed 02/02/2026 · confidence: medium
- Timeline.7: {"event":"Title V operating permit issued","date":"2026-05-13","detail":"Allegheny County issued Springdale Energy, LLC Title V Operating Permit No. 0580-OP26, with an expiration date of May 13, 2031."} — Source · confidence: medium
- Commercial parties.0: {"relationship":"Facility operator and named permittee","name":"Springdale Energy, LLC","detail":"Identified as the operator of EIA plant 55710 and the permittee under Allegheny County Title V Operating Permit No. 0580-OP26. The public records do not separately state the post-2026 legal ownership chain below the portfolio owner.","official_url":null} — Source · confidence: medium

## Timeline

- 2026-05-13 — Title V operating permit issued
  Allegheny County issued Springdale Energy, LLC Title V Operating Permit No. 0580-OP26, with an expiration date of May 13, 2031.
  Source: Source (https://www.alleghenycounty.us/files/assets/county/v/1/government/health/documents/air-quality/title-v/springdale-energy-tvop.pdf)

## Sources

- [LS Power Completes Acquisition of 844 MW Power Generation Portfolio in the Northeast - LS Power](https://www.lspower.com/news/ls-power-completes-acquisition-844-mw-power-generation-portfolio-northeast/) — lspower.com · tier other
- [Source](https://www.alleghenycounty.us/files/assets/county/v/3/government/health/documents/air-quality/title-v/springdale-energy-tvrv.pdf) — alleghenycounty.us · 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
- [Springdale power plant property could be rezoned residential](https://archive.triblive.com/local/valley-news-dispatch/springdale-power-plant-property-could-be-rezoned-residential/) — archive.triblive.com · tier other
- [Allegheny Energy Begins Commercial Startup of Pennsylvania Power ...](https://www.industrialinfo.com/news/article/allegheny-energy-begins-commercial-startup-of-pennsylvania-power-generators--31262) — industrialinfo.com · tier other
- [SGT6-5000F Heavy-duty gas turbine (60 Hz)](https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html) — siemens-energy.com · tier other
- [Source](https://www.alleghenycounty.us/files/assets/county/v/1/government/health/documents/air-quality/title-v/springdale-energy-tvop.pdf) — alleghenycounty.us · tier other
- [FirstEnergy Subsidiaries Sign Revised Agreement for Sale of ...](https://investors.firstenergycorp.com/investor-materials/news-releases/news-details/2017/FirstEnergy-Subsidiaries-Sign-Revised-Agreement-for-Sale-of-Competitive-Natural-Gas-and-Hydro-Assets/default.aspx) — investors.firstenergycorp.com · tier other
- [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
- [FirstEnergy to Sell Competitive Natural Gas and Hydro Assets to LS Power Equity Partners](https://investors.firstenergycorp.com/investor-materials/news-releases/news-details/2017/FirstEnergy-to-Sell-Competitive-Natural-Gas-and-Hydro-Assets-to-LS-Power-Equity-Partners/default.aspx) — investors.firstenergycorp.com · tier other
- [Old Faithful](https://www.feretirees.com/news/old-faithful/) — feretirees.com · tier other
- [ALLEGHENY COUNTY HEALTH DEPARTMENT](https://alleghenycounty.us/files/assets/county/v/3/government/health/documents/air-quality/title-v/springdale-energy-tvrv.pdf) — alleghenycounty.us · tier other

## Data quality

- The disclosed $825 million 2017 consideration was for a multi-asset portfolio, and no allocation to EIA plant 55710 or plant-specific project financing was disclosed. The evidence identifies Springdale Energy in the acquired generation-facilities table but does not separately state a purchase-price allocation for this plant. The available records show the three units operating and report no completed uprate or derate; no separate retirement or repowering event was identified. A construction-start date was not disclosed; July 2003 is the reported initial-operation date.

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