Conemaugh is a coal-fired power facility with 1,951 MW of EIA-reported nameplate capacity in Indiana County, Pennsylvania, registered as EIA Plant ID 3118. Its 1994-1995 flue-gas-desulfurization project reduced Unit 1 sulfur-dioxide emissions by approximately 95%; the project was described as one of the first U.S. plant modifications using scrubbers to meet the 1990 Clean Air Act Amendments.
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Primary generation technology.
Indiana County · PJM
Conemaugh is currently operating; a closure or retirement is listed for December 31, 2034.
Best-supported operating milestone.
Conventional Steam Coal
Conemaugh is currently operating; a closure or retirement is listed for December 31, 2034.
Conemaugh is currently operating; a closure or retirement is listed for December 31, 2034.
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 975.5 MW 850 MW summer | Conventional Steam Coal Bituminous Coal · ST | May 1970 | Operating |
| 2 | 975.5 MW 850 MW summer | Conventional Steam Coal Bituminous Coal · ST | May 1971 | Operating |
| A | 3 MW 2.8 MW summer | Petroleum Liquids Disillate Fuel Oil · IC | Feb 1970 | Operating |
| B | 3 MW 2.8 MW summer | Petroleum Liquids Disillate Fuel Oil · IC | Feb 1970 | Standby/Backup: available for service but not normally used |
| C | ||||
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Drag organizations to explore the network. Select a node to pin its details and available page link.
Project milestones and public references behind the asset profile.
EIA-860 lists generator A, generator B, generator C, generator D with this operating date.
PJM
PJM · Indiana County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| ConemaughCurrent | 1,951 MW | PA | |
| Keystone | 1,872 MW | PA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioEIA-860 lists generator 1 with this operating date.
Unit 1 entered commercial operation on May 21, 1970.
EIA-860 lists generator 2 with this operating date.
Unit 2 entered commercial operation on May 27, 1971.
Unit 1's new FGD system entered service and reduced sulfur-dioxide emissions by approximately 95%.
A second scrubber for Unit 2 was scheduled for completion in fall 1995; the two-scrubber project was expected to cost approximately $341 million and support compliance with the 1990 Clean Air Act Amendments.
Allegheny Energy Supply acquired a 4.86% interest, described as an 83 MW share, in Conemaugh. The cited announcement does not identify the seller.
Allegheny Energy Supply announced an agreement to sell its 83 MW share to UGI Development Co. for approximately $51.25 million, subject to a $3 million credit in favor of UGI and regulatory approvals.
The fourth cell of the ash-filter ponds was reconstructed.
The desilting basin was reconstructed, expanded, lined, and fitted with an under-drain system.
Pennsylvania announced a proposed consent decree under which the plants, previously scheduled to cease operations on December 31, 2028, could continue operating through 2032 after required wastewater-treatment upgrades.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Conemaugh has a reported capacity of 1,951 MW. Source: EIA Form 860.
Conemaugh is a Conventional Steam Coal facility in Indiana County, PA, participating in the PJM market.
Conemaugh is in Indiana County, PA, inside the PJM balancing area.
Conemaugh is operated by KeyCon Operating LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Conemaugh reported 4,712.1 GWh over the twelve months to 2026-06. Figures are net generation as filed to EIA-923.
By capacity, Conemaugh ranks #18 of 206 operating plants of the same technology nationally. It ranks #1 of 14 in PA.
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.
