Keystone — 1,872 MW coal plant, Armstrong County, PA

Keystone — 1,872 MW coal plant, Armstrong County, PA · Ask the Grid

Generation and physical site

EIA plant 3136 · Inventory for Sep 2026.

Reported operating nameplate by technology

Coal: 1,872 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (6)

EIA generator status and nameplate capacity for Keystone
Generator	Technology	Status	Power (MW)	Energy (MWh)
1	Conventional Steam Coal	Operating	936	Unknown
2	Conventional Steam Coal	Operating	936	Unknown
3	Petroleum Liquids	Standby	2.5	Unknown
4	Petroleum Liquids	Standby	2.9	Unknown
5	Petroleum Liquids	Standby	2.9	Unknown
6	Petroleum Liquids	Standby	2.9	Unknown

Physical map location · OpenStreetMap: 40.65954, -79.33961
Filed location · EIA: 40.66040, -79.34110

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Sep 2026
EIA retrieved: Oct 24, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Nov 4, 2023
Map prepared: Oct 24, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

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

Generator	Capacity	Technology	Operation	Status
1	936 MW 850 MW summer	Conventional Steam Coal ST	Aug 1967	Operating
2	936 MW 850 MW summer	Conventional Steam Coal ST	Jul 1968	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.

Land and environmental record

Air Permit

Jan 25, 2024

Permit No. Title V/State Operating Permit 03-00027; DEP Authorization ID 1467325; DEP PF ID 275229

Pennsylvania DEP proposed Title V permit 03-00027 for Keystone Station, marked proposed January 25, 2024. Prior permit modification April 17, 2020.

Source

Cooling Water

Apr 30, 2020

Crooked Creek is cooling-water source and receiving water; intake flow 18.76 MGD; modeled consumptive loss 8.054 MGD

Station obtains cooling water from Crooked Creek upstream of Outfall 003. Intake flow used in thermal modeling: 18.76 MGD; modeled consumptive loss: 8.054 MGD; modeled maximum discharge: 10.706 MGD.

Source

Site Acreage

Approximately 1,500 acres

Site reported as occupying roughly 1,500 acres in Plumcreek Township. This is site-area statement, not verified parcel-by-parcel county assessment total.

Keystone Generating Station

Wastewater Discharge

Apr 30, 2020

Outfall 003: 7.96 MGD average design flow and 10.7 MGD maximum design flow to Crooked Creek

Outfall 003 carries combined discharge from monitored sources, discharging through final settling pond to Crooked Creek at 40°39′19″ N, 79°21′06″ W. Design flow: 7.96 MGD average, 10.7 MGD maximum.

Source

Wastewater Permit

Apr 30, 2020

NPDES Permit PA0002062, amendment A-2; APS ID 1002478; Authorization ID 1289755; Client ID 350861; Site ID 243270

Pennsylvania DEP identifies PA0002062 A-2 as major individual industrial-waste and stormwater authorization for Keystone Generating Station.

Source

Mapped facility footprint

Mapped infrastructure geometry associated with this asset.© OpenStreetMap contributors · way/64971452

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

Drag organizations to explore the network. Select a node to pin its details and available page link.

AssetOwner / operatorContractorRelated asset

Parties and identifiers

OrganizationRoleBasis

Reporting portfolio

EIA reporting entity

KeyCon Operating LLC

Entity 63047

Operating portfolio

2 plants

1 states

Reported capacity

3,823 MW

Conventional Steam Coal

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Conemaugh	1,951 MW	PA
KeystoneCurrent	1,872 MW	PA

Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.

View full reporting portfolio

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

1967
1967
Unit 1 commercial operationKeystone Ge...
Keystone's first coal-fired generating unit entered commercial operation in 1967.
Aug 1967
Aug 1967
Generator enters operationEIA-860
EIA-860 lists generator 1 with this operating date.
1968
1968
Unit 2 commercial operationKeystone Ge...
The second coal-fired generating unit entered commercial operation in 1968; sources also describe the plant as expanded in 1968.
View 1 more milestoneHide 1 milestone
1. Jul 1968
  Jul 1968
  Generator enters operationEIA-860
  EIA-860 lists generator 2 with this operating date.
Nov 14, 2005
Nov 14, 2005
Atlantic City Electric sale agreementSource
Duquesne Light Holdings entered a purchase and sale agreement to acquire Atlantic City Electric's combined 108-MW interests in Keystone and Conemaugh, including a 2.47% Keystone interest.
Dec 14, 2018
Dec 14, 2018
GenOn Chapter 11 reorganizationGenOn Compl...
GenOn completed its reorganization and transferred its interests in Keystone and Conemaugh, together with other consideration, to new owners.
Apr 21, 2026
Apr 21, 2026
Operation extended under proposed consent decreeShapiro Adm...
Pennsylvania announced a proposed consent decree allowing Keystone and Conemaugh to continue operating through 2032, contingent on upgraded wastewater-treatment equipment and related bottom-ash-system compliance work.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

en.wikipedia.orgKeystone Generating Stationother

Common questions about Keystone

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Keystone?

Keystone reports 1,872 MW coal of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.

What kind of plant is Keystone?

Keystone is a Conventional Steam Coal facility in Armstrong County, PA, participating in the PJM market.

Where is Keystone located?

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

Who operates Keystone?

Keystone is operated by KeyCon Operating LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

When did Keystone start operating?

Keystone reports a commercial operation date of 1967. Current status: operating. Source: EIA Sep 2026.

How much electricity does Keystone generate?

Keystone reported 4,025.3 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

Where does Keystone connect to the grid?

Keystone interconnects at Keystone Substation, on the Pennsylvania Electric Co. (Penelec) system.

How does Keystone compare to other plants?

By capacity, Keystone ranks #20 of 205 operating plants of the same technology nationally. It ranks #2 of 13 in PA.

Co-located assets

Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.

ArmstrongNatural Gas Fired Combustion TurbineNatural Gas Fired Combustion Turbine688 MW2.6 km Indiana University of PennsylvaniaNatural Gas Internal Combustion EngineNatural Gas Internal Combustion Engine24 MW16 km Allegheny No 6 Hydro StationConventional HydroelectricConventional Hydroelectric9 MW21 km Conemaugh Hydro PlantConventional Hydroelectric

Overview

Overview

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Infrastructure record

Profile

Structured profile

Generation and physical site

Reported operating nameplate by technology

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Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Market registration

Nearby substations

Commercial, land, and environmental record

Land and environmental record

Related parties and identifiers

Relationship graph

Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

Sources

Common questions about Keystone

How big is Keystone?

What kind of plant is Keystone?

Where is Keystone located?

Who operates Keystone?

When did Keystone start operating?

How much electricity does Keystone generate?

Where does Keystone connect to the grid?

How does Keystone compare to other plants?

Co-located assets

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