How big is York Energy Center?

York Energy Center has a reported capacity of 1,449.4 MW. Source: EIA Form 860.

What kind of plant is York Energy Center?

York Energy Center is a Natural Gas Fired Combined Cycle facility in York County, PA, participating in the PJM market.

Where is York Energy Center located?

York Energy Center is in York County, PA, inside the PJM balancing area.

Who operates York Energy Center?

York Energy Center is operated by Calpine Mid-Merit LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does York Energy Center generate?

York Energy Center reported 8,964.3 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

Where does York Energy Center connect to the grid?

York Energy Center interconnects at Bramah Substation, on the PECO Energy Co system.

How does York Energy Center compare to other plants?

By capacity, York Energy Center ranks #24 of 538 operating plants of the same technology nationally. It ranks #2 of 26 in PA.

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Natural Gas Fired Combined CyclePJM · York County

York Energy Center

Calpine Mid-Merit LLC · York County · PJM

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.

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plant:plant-55524

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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: 1,449.4 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combined Cycle
Primary generation technology.
Registry anchor: Plant 55524
Calpine Mid-Merit LLC · York County · PJM
Operating status: Operating
York Energy Center is operating.
Grid connection: Bramah Substation
500 kV · PECO Energy Co

Profile

Grid role: IPP non-CHP combined-cycle generation
Grid connection: Bramah Substation · 500 kV · PECO Energy Co.
Physical build: York Energy Center (EIA plant 55524) is a 1,449.4-MW natural-gas combined-cycle plant with seven operating generators: five combustion turbines and two steam turbines. York 1 comprises three Siemens SGT6-2000E combustion turbines and one 200-MW steam turbine. York 2 comprises two GE 7F.05 combustion turbines, two dedicated heat-recovery steam generators, and one steam turbine; its EIA generator records identify CTG5 and CTG6 at 234.9 MW each and STG2 at 419.6 MW.

Structured profile

Reported capacity: 1,449.4 MW
Natural Gas Fired Combined Cycle
Operating status: operating
York Energy Center is operating.
Interconnection: Bramah Substation
500 kV · PECO Energy Co
Location: York County
PJM
Operator

Units and generators

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

Generator	Capacity	Technology	Operation	Status
CTG1	120 MW 125 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Mar 2011	Operating
CTG2	120 MW 125 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Mar 2011	Operating
CTG3	120 MW 125 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Mar 2011	Operating
CTG5	234.9 MW

Performance

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

Peer context

Technology capacity: 1,449.4 MW
National rank: #24
PA rank: #2

Monthly generation

Download CSV

Latest 12 months

8.96 TWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

69.2%

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

DELTA YORK EC

IN SERVICE · 500 kV

0.3 km

UNKNOWN123451

Commercial, land, and environmental record

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

Land and environmental record

Air Permit

Jan 1, 2026

Permit No. Title V/State Operating Permit 67-05147; DEP Auth ID 1536528

Pennsylvania DEP issued Title V/State Operating Permit for Calpine Mid Merit II LLC / York Energy Center Block 2. Issue date December 9, 2025; effective January 1, 2026; expires December 31, 2030.

1536528[67-05147]_Issued_v3.pdf

Cooling And Water Source

Jul 10, 2025

Susquehanna River is the cooling-water source; wet mechanical-draft cooling is used

SRBC application states York Energy Center has one main intake and pumphouse along Susquehanna River supplying York 1 and York 2 cooling and process-water needs. York 1 uses mechanical-draft wet cooling tower. Application states current design not compatible with dry cooling and retrofit infeasible.

Source

Environmental Compliance Milestone

Jul 31, 2024

No violations identified in 2024 DEP inspection; no open violations reported for Block 2

Block 1 fact sheet reports July 31, 2024 compliance evaluation inspection with no violations and field results within permit limits. Block 2 fact sheet reports same inspection date result and states no open violations associated with permittee or facility.

Source

Landowner Operator

Jun 18, 2025

Calpine Mid-Merit LLC identified as owner/operator for York 1

Public notice and SRBC application identify Calpine Mid-Merit LLC as anticipated long-term owner and operator of York Energy Center Block 1 on Tax Parcel No. 43-000-BQ-0011L.

PUBLIC NOTICE Notice is hereby given that on May 28, 2025, Calpine Mid Merit, LLC | Public Notices | lancasteronline.com

Wastewater Permit And Discharge

Nov 10, 2025

NPDES Permit PA0282022 for York Energy Center Block 1

Pennsylvania DEP Block 1 NPDES permit authorizes discharge to Susquehanna River and unnamed tributary. Outfall 001A: noncontact cooling-water discharge, design flow 2.7 MGD. Outfall 100 (Internal Monitor Point): recycle-water-treatment effluent, 0.05 MGD.

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 / operatorContractorOrganization

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Mar 2011
Mar 2011
Generators enter operationEIA-860
EIA-860 lists generator CTG1, generator CTG2, generator CTG3, generator STG1 with this operating date.
Aug 2017
Aug 2017
ECP announces Calpine take-private

York Energy Center

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York Energy Center

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Overview

Key fields

Profile

Structured profile

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Relationship graph

Timeline and sources

Project timeline

Parties and identifiers

Reporting portfolio

Sources

Common questions about York Energy Center

How big is York Energy Center?

What kind of plant is York Energy Center?

Where is York Energy Center located?

Who operates York Energy Center?

How much electricity does York Energy Center generate?

Where does York Energy Center connect to the grid?

How does York Energy Center compare to other plants?

Co-located assets

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