# York Energy Center PJM Natural Gas Fired Combined Cycle · https://askthegrid.com/assets/facilities/york-energy-center York Energy Center is a natural gas-fired power facility with 1,449.4 MW of EIA-reported nameplate capacity in York County, Pennsylvania, registered as EIA Plant ID 55524. Calpine Mid-Merit LLC owns and operates the plant. The plant's generating configuration is seven operating dual-fuel natural-gas combined-cycle generators: Block 1/CCB1 has CTG1, CTG2, CTG3, and STG1 (3 combustion turbines plus 1 steam turbine), while Block 2/CCB2 has CTG5, CTG6, and STG2 (2 combustion turbines plus 1 steam turbine). The facility interconnects at Bramah Substation at 500 kV. ## Key facts - Technology: Natural Gas Fired Combined Cycle - Power capacity: 1449.4 MW - Operating status: operating ## Grid and market context - ISO/RTO: PJM - Balancing authority: PJM Interconnection, LLC (PJM) - Substation: Bramah Substation - Point of interconnection: Bramah Substation - Transmission owner: PECO Energy Co - Interconnection voltage: 500 kV ## Source-backed facts - Identifiers: [{"value":"55524","system":"EIA plant code"},{"value":"PJM","system":"PJM balancing authority / RTO"},{"value":"DLTAPLNT","system":"PJM LMP node designation"},{"value":"DLTAPLNT","system":"PJM wholesale-sales reporting location"},{"value":"1000071","system":"EPA GHGRP facility ID"},{"value":"110043196528","system":"EPA FRS ID"},{"value":"CTG1","system":"EIA generator ID"},{"value":"CTG2","system":"EIA generator ID"},{"value":"CTG3","system":"EIA generator ID"},{"value":"STG1","system":"EIA generator ID"},{"value":"CTG5","system":"EIA generator ID"},{"value":"CTG6","system":"EIA generator ID"},{"value":"STG2","system":"EIA generator ID"},{"value":"CCB1","system":"EIA unit code for CTG1, CTG2, CTG3, and STG1"},{"value":"CCB2","system":"EIA unit code for CTG5, CTG6, and STG2"},{"value":"1536528","system":"Pennsylvania DEP permit / Block 2"},{"value":"67-05083D/F","system":"Pennsylvania DEP permit / Block 2"}] — EPA Facility Level GHG Emissions Data · confidence: medium - Identifiers: [{"value":"55524","system":"EIA plant code"},{"value":"PJM","system":"PJM balancing authority / RTO"},{"value":"DLTAPLNT","system":"PJM LMP node designation"},{"value":"DLTAPLNT","system":"PJM wholesale-sales reporting location"},{"value":"1000071","system":"EPA GHGRP facility ID"},{"value":"110043196528","system":"EPA FRS ID"},{"value":"CTG1","system":"EIA generator ID"},{"value":"CTG2","system":"EIA generator ID"},{"value":"CTG3","system":"EIA generator ID"},{"value":"STG1","system":"EIA generator ID"},{"value":"CTG5","system":"EIA generator ID"},{"value":"CTG6","system":"EIA generator ID"},{"value":"STG2","system":"EIA generator ID"},{"value":"CCB1","system":"EIA unit code for CTG1, CTG2, CTG3, and STG1"},{"value":"CCB2","system":"EIA unit code for CTG5, CTG6, and STG2"},{"value":"1536528","system":"Pennsylvania DEP permit / Block 2"},{"value":"67-05083D/F","system":"Pennsylvania DEP permit / Block 2"}] — TITLE V/STATE OPERATING PERMIT · confidence: medium - Parties: [{"relationship":"Owner / EIA-registered utility","name":"Calpine Mid-Merit LLC","official_url":"https://www.calpine.com/"},{"relationship":"Parent company / Calpine business-unit owner","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"},{"relationship":"Block 2 permit holder","name":"Calpine Mid Merit II LLC","official_url":"https://www.calpine.com/"},{"relationship":"Power offtaker","name":"Constellation Energy Group","official_url":"https://www.constellationenergy.com/"},{"relationship":"Power offtaker","name":"Constellation Energy Resources","official_url":"https://www.constellationenergy.com/"},{"relationship":"Gas-turbine supplier / OEM","name":"Siemens","official_url":"https://www.siemens-energy.com/"},{"relationship":"Announced prospective acquirer of the York 1 and York 2 facilities; sale pending regulatory approvals","name":"LS Power","official_url":"https://www.lspower.com/"}] — TITLE V/STATE OPERATING PERMIT · confidence: medium - Parties: [{"relationship":"Owner / EIA-registered utility","name":"Calpine Mid-Merit LLC","official_url":"https://www.calpine.com/"},{"relationship":"Parent company / Calpine business-unit owner","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"},{"relationship":"Block 2 permit holder","name":"Calpine Mid Merit II LLC","official_url":"https://www.calpine.com/"},{"relationship":"Power offtaker","name":"Constellation Energy Group","official_url":"https://www.constellationenergy.com/"},{"relationship":"Power offtaker","name":"Constellation Energy Resources","official_url":"https://www.constellationenergy.com/"},{"relationship":"Gas-turbine supplier / OEM","name":"Siemens","official_url":"https://www.siemens-energy.com/"},{"relationship":"Announced prospective acquirer of the York 1 and York 2 facilities; sale pending regulatory approvals","name":"LS Power","official_url":"https://www.lspower.com/"}] — Power plant profile: York Energy Center, US · confidence: medium - Identifiers.4: {"value":"1000071","system":"EPA GHGRP facility ID"} — EPA Facility Level GHG Emissions Data · confidence: high - Identifiers.5: {"value":"110043196528","system":"EPA FRS ID"} — EPA Facility Level GHG Emissions Data · confidence: high - Parties.3: {"relationship":"Power offtaker","name":"Constellation Energy Group","official_url":"https://www.constellationenergy.com/"} — Power plant profile: York Energy Center, US · confidence: medium - Parties.4: {"relationship":"Power offtaker","name":"Constellation Energy Resources","official_url":"https://www.constellationenergy.com/"} — Power plant profile: York Energy Center, US · confidence: medium - Parties.5: {"relationship":"Gas-turbine supplier / OEM","name":"Siemens","official_url":"https://www.siemens-energy.com/"} — Power plant profile: York Energy Center, US · confidence: medium - Interconnection: PECO Energy Co. 500-kV transmission system, including the Calpine–Peach Bottom 500-kV generation-lead line; PJM LMP node DLTAPLNT. — Source · confidence: medium - Power mw: 1449.4 — Source · confidence: high - Quality notes: ["The EIA plant record reports 1,449.4 MW for the combined plant, while the Federal Register describes York 1 as 569 MW and York 2 as 828 MW; the figures are not identical and should not be treated as interchangeable ratings.","A secondary project profile reports an $800 million York 2 project cost, while a contemporary local report said the construction cost was not disclosed. The $800 million figure should therefore be treated as a reported project-cost estimate, not as a confirmed financing amount.","The LS Power transaction was announced in March 2026 and was conditioned on regulatory approvals; it should not be recorded as a completed ownership transfer by the August 2, 2026 cutoff. No retirement or repowering milestone is identified in the cited project-history records."] — Source · confidence: medium - Quality notes: ["The EIA plant record reports 1,449.4 MW for the combined plant, while the Federal Register describes York 1 as 569 MW and York 2 as 828 MW; the figures are not identical and should not be treated as interchangeable ratings.","A secondary project profile reports an $800 million York 2 project cost, while a contemporary local report said the construction cost was not disclosed. The $800 million figure should therefore be treated as a reported project-cost estimate, not as a confirmed financing amount.","The LS Power transaction was announced in March 2026 and was conditioned on regulatory approvals; it should not be recorded as a completed ownership transfer by the August 2, 2026 cutoff. No retirement or repowering milestone is identified in the cited project-history records."] — York 2 Energy Center, US · confidence: medium - Quality notes: ["The EIA plant record reports 1,449.4 MW for the combined plant, while the Federal Register describes York 1 as 569 MW and York 2 as 828 MW; the figures are not identical and should not be treated as interchangeable ratings.","A secondary project profile reports an $800 million York 2 project cost, while a contemporary local report said the construction cost was not disclosed. The $800 million figure should therefore be treated as a reported project-cost estimate, not as a confirmed financing amount.","The LS Power transaction was announced in March 2026 and was conditioned on regulatory approvals; it should not be recorded as a completed ownership transfer by the August 2, 2026 cutoff. No retirement or repowering milestone is identified in the cited project-history records."] — Calpine Corporation dedicates new power plant · confidence: medium - Timeline: [{"event":"Original York Energy Center commercial operation","date":"2011-03","detail":"York 1, the original York Energy Center facility, began commercial operation in March 2011."},{"event":"ECP announces Calpine take-private","date":"2017-08","detail":"Energy Capital Partners announced a roughly $17 billion take-private of Calpine, establishing the predecessor ownership context for Calpine's York assets."},{"event":"ECP-led consortium completes Calpine acquisition","date":"2018-03","detail":"An Energy Capital Partners-led consortium, including Access Industries and Canada Pension Plan Investment Board, completed the acquisition of Calpine; Calpine stockholders received $15.25 per share in cash."},{"event":"York 2 construction completion and commercial operation","date":"2019-03-17","detail":"The 828 MW dual-fuel York 2 expansion commenced commercial operation on March 17, 2019, adding a second co-located combined-cycle facility."},{"event":"York 2 substantial completion and turnover","date":"2019-03-18","detail":"McDermott announced substantial completion of the York 2 combined-cycle EPC project and turnover to Calpine Mid-Merit LLC for commercial operations."},{"event":"Constellation announces Calpine acquisition agreement","date":"2025-01-10","detail":"Constellation and Calpine announced a cash-and-stock acquisition agreement valued at approximately $16.4 billion in equity consideration, with an approximately $26.6 billion net purchase price after debt and other adjustments."},{"event":"DOJ/FERC York divestiture remedy","date":"2025-12","detail":"The proposed antitrust remedy for the Calpine acquisition identified York Energy Center, consisting of York 1 and York 2, among the PJM facilities required to be divested."},{"event":"Constellation completes Calpine acquisition","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, thereby becoming the parent company of Calpine's York assets."},{"event":"Agreement to sell York 1 and York 2 to LS Power","date":"2026-03-18","detail":"Constellation agreed to sell a portfolio including York 1 and York 2 to LS Power. The portfolio transaction was valued at $5 billion before closing adjustments, with closing conditioned on regulatory approvals and other customary conditions."}] — Power plant profile: York Energy Center, US · confidence: high - Timeline.0: {"event":"Original York Energy Center commercial operation","date":"2011-03","detail":"York 1, the original York Energy Center facility, began commercial operation in March 2011."} — Power plant profile: York Energy Center, US · confidence: medium - Commercial parties.0: {"relationship":"Owner / project company and operator","name":"Calpine Mid-Merit LLC","detail":"Calpine Mid-Merit LLC owned the York facilities through the Calpine organization and was identified as the owner of the York 2 expansion; the plant record identifies it as the EIA-registered operator.","official_url":"https://www.calpine.com/"} — Commercial operations started at 828MW York 2 energy center · confidence: medium - Commercial parties.6: {"relationship":"Turbine and generator supplier for York 1","name":"Siemens","detail":"Siemens supplied three SGT6-2000E gas turbines and the electric generator equipment identified for the original York Energy Center project.","official_url":"https://www.siemens-energy.com/"} — Power plant profile: York Energy Center, US · confidence: medium - Commercial parties.7: {"relationship":"Power offtakers","name":"Constellation Energy Group and Constellation Energy Resources","detail":"Both entities are identified as power offtakers for the original York Energy Center project.","official_url":"https://www.constellationenergy.com/"} — Power plant profile: York Energy Center, US · confidence: medium - Quality notes.0: The EIA plant record reports 1,449.4 MW for the combined plant, while the Federal Register describes York 1 as 569 MW and York 2 as 828 MW; the figures are not identical and should not be treated as interchangeable ratings. — Source · confidence: high - Quality notes.1: A secondary project profile reports an $800 million York 2 project cost, while a contemporary local report said the construction cost was not disclosed. The $800 million figure should therefore be treated as a reported project-cost estimate, not as a confirmed financing amount. — York 2 Energy Center, US · confidence: high - Quality notes.1: A secondary project profile reports an $800 million York 2 project cost, while a contemporary local report said the construction cost was not disclosed. The $800 million figure should therefore be treated as a reported project-cost estimate, not as a confirmed financing amount. — Calpine Corporation dedicates new power plant · confidence: high - Quality notes.2: The LS Power transaction was announced in March 2026 and was conditioned on regulatory approvals; it should not be recorded as a completed ownership transfer by the August 2, 2026 cutoff. No retirement or repowering milestone is identified in the cited project-history records. — Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction · confidence: medium - Substation: Bramah Substation — www.transourceenergy.com Overview of Transource PA, Bramah Substation, PaPUC Application · confidence: medium ## Timeline - 2017-08 — ECP announces Calpine take-private Energy Capital Partners announced a roughly $17 billion take-private of Calpine, establishing the predecessor ownership context for Calpine's York assets. Source: Calpine | Energy Capital Partners I ECP (https://www.ecpgp.com/equity/portfolio/calpine) - 2018-03 — ECP-led consortium completes Calpine acquisition An Energy Capital Partners-led consortium, including Access Industries and Canada Pension Plan Investment Board, completed the acquisition of Calpine; Calpine stockholders received $15.25 per share in cash. Source: Consortium Led by Energy Capital Partners Completes Acquisition of Calpine Corporation; Announces Management Roles and Board of Directors | Energy Capital Partners I ECP (https://www.ecpgp.com/about/news-and-insights/press-releases/2018/consortium-led-by-energy-capital-partners-completes-acquisition-of-calpine-corporation-announces-management-roles-and-board-of-directors) - 2019-03-18 — York 2 substantial completion and turnover McDermott announced substantial completion of the York 2 combined-cycle EPC project and turnover to Calpine Mid-Merit LLC for commercial operations. Source: Press Release Detail | McDermott (https://www.mcdermott.com/press-release-detail/122895/mcdermott-announces-substantial-completion-calpines-york-2-energy-center-combined-cycle-power) - 2025-12 — DOJ/FERC York divestiture remedy The proposed antitrust remedy for the Calpine acquisition identified York Energy Center, consisting of York 1 and York 2, among the PJM facilities required to be divested. Source: Source (https://public-inspection.federalregister.gov/2025-23298.pdf) - 2026-01-07 — Constellation completes Calpine acquisition Constellation completed its acquisition of Calpine from Energy Capital Partners, thereby becoming the parent company of Calpine's York assets. Source: Constellation Completes Calpine Transaction, Powering America's Clean Energy Future (https://www.constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html) ## Sources - [EPA Facility Level GHG Emissions Data](https://ghgdata.epa.gov/flight/details/1000071/2023/E) — ghgdata.epa.gov · tier regulatory - [TITLE V/STATE OPERATING PERMIT](https://files.dep.state.pa.us/air/AirQuality/AQPortalFiles/Permits/PermitDocuments/1536528[67-05147]_Issued_v3.pdf) — files.dep.state.pa.us · tier other - [Power plant profile: York Energy Center, US](https://www.power-technology.com/data-insights/power-plant-profile-york-energy-center-us/) — power-technology.com · tier other - [Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction](https://www.constellationenergy.com/news/2026/03/constellation-announces-agreement-to-sell-pjm-generation-assets-to-ls-power-as-part-of-ferc-us-doj-resolution-of-calpine-transaction.html) — constellationenergy.com · tier other - [Source](https://www.puc.pa.gov/pcdocs/1851334.pdf) — puc.pa.gov · tier regulatory - [Source](https://www.puc.pa.gov/pcdocs/1856712.pdf) — puc.pa.gov · tier regulatory - [Commercial operations started at 828MW York 2 energy center](https://www.nsenergybusiness.com/news/york-2-energy-center/) — nsenergybusiness.com · tier other - [SGT6-2000E Heavy-duty gas turbine (60 Hz)](https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-2000e.html) — siemens-energy.com · 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 - [Source](https://public-inspection.federalregister.gov/2025-23298.pdf) — public-inspection.federalregister.gov · tier regulatory - [Calpine Corporation dedicates new power plant](https://www.pennlive.com/life/2019/06/calpine-corporation-dedicates-new-power-plant.html) — pennlive.com · tier other - [Constellation Completes Calpine Transaction, Powering America's Clean Energy Future](https://www.constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html) — constellationenergy.com · tier other - [York 2 Energy Center, US](https://www.power-technology.com/marketdata/york-2-energy-center-us/) — power-technology.com · tier other - [Calpine | Energy Capital Partners I ECP](https://www.ecpgp.com/equity/portfolio/calpine) — ecpgp.com · tier other - [Consortium Led by Energy Capital Partners Completes Acquisition of Calpine Corporation; Announces Management Roles and Board of Directors | Energy Capital Partners I ECP](https://www.ecpgp.com/about/news-and-insights/press-releases/2018/consortium-led-by-energy-capital-partners-completes-acquisition-of-calpine-corporation-announces-management-roles-and-board-of-directors) — ecpgp.com · tier other - [Press Release Detail | McDermott](https://www.mcdermott.com/press-release-detail/122895/mcdermott-announces-substantial-completion-calpines-york-2-energy-center-combined-cycle-power) — mcdermott.com · tier other - [Overview of Transource PA, Bramah Substation, PaPUC ...](https://www.transourceenergyprojects.com/Bramah/docs/Bramah%20Project%20Fact%20Sheet.pdf) — transourceenergyprojects.com · tier other - [Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction - LS Power](https://www.lspower.com/news/constellation-announces-agreement-to-sell-pjm-generation-assets-to-ls-power-as-part-of-ferc-u-s-doj-resolution-of-calpine-transaction/) — lspower.com · tier other ## Data quality - The EIA plant record reports 1,449.4 MW for the combined plant, while the Federal Register describes York 1 as 569 MW and York 2 as 828 MW; the figures are not identical and should not be treated as interchangeable ratings. A secondary project profile reports an $800 million York 2 project cost, while a contemporary local report said the construction cost was not disclosed. The $800 million figure should therefore be treated as a reported project-cost estimate, not as a confirmed financing amount. No retirement or repowering milestone is identified in the cited project-history records. --- Canonical page: https://askthegrid.com/assets/facilities/york-energy-center Source: Ask the Grid — https://askthegrid.com/