# Mountaineer

PJM Conventional Steam Coal · https://askthegrid.com/assets/facilities/mountaineer

Mountaineer is a coal-fired power facility with 1,300 MW of EIA-reported operating capacity in Mason County, West Virginia, registered as EIA Plant ID 6264. Appalachian Power Co owns and operates the plant. The demonstration was installed at Mountaineer's single 1,300-MWe coal-fired generating unit. Commercial operation began in 1980.

## Key facts

- Technology: Conventional Steam Coal
- Power capacity: 1300 MW
- Commercial operation: 1980
- Operating status: operating

## Grid and market context

- ISO/RTO: PJM
- Balancing authority: PJM
- Transmission owner: Appalachian Power Company

## Source-backed facts

- Owner logo domain: aep.com — AEP.com · confidence: medium
- Identifiers: [{"value":"6264","system":"EIA plant ID"},{"value":"733","system":"EIA utility/entity ID"},{"value":"1","system":"EIA generator/unit ID"},{"value":"PJM","system":"ISO/RTO"},{"value":"MOUNTAINEER 1","system":"PJM existing capacity resource"},{"value":"053-00009","system":"West Virginia Title V operating permit"}] — Form EIA-923, "Power Plant Operations Report" 2010 · confidence: medium
- Identifiers: [{"value":"6264","system":"EIA plant ID"},{"value":"733","system":"EIA utility/entity ID"},{"value":"1","system":"EIA generator/unit ID"},{"value":"PJM","system":"ISO/RTO"},{"value":"MOUNTAINEER 1","system":"PJM existing capacity resource"},{"value":"053-00009","system":"West Virginia Title V operating permit"}] — Sheet1 · confidence: medium
- Identifiers: [{"value":"6264","system":"EIA plant ID"},{"value":"733","system":"EIA utility/entity ID"},{"value":"1","system":"EIA generator/unit ID"},{"value":"PJM","system":"ISO/RTO"},{"value":"MOUNTAINEER 1","system":"PJM existing capacity resource"},{"value":"053-00009","system":"West Virginia Title V operating permit"}] — Title V Permits and Applications · confidence: medium
- Owner name: American Electric Power — Source · confidence: medium
- Description: Mountaineer is a coal-fired generating plant on the Ohio River near New Haven in Mason County, West Virginia. It consists of a single electric generating unit nominally rated at 1,300 MW. Appalachian Power Company owns Unit 1, and PJM lists the facility as the MOUNTAINEER 1 capacity resource. — Source · confidence: high
- Description: Mountaineer is a coal-fired generating plant on the Ohio River near New Haven in Mason County, West Virginia. It consists of a single electric generating unit nominally rated at 1,300 MW. Appalachian Power Company owns Unit 1, and PJM lists the facility as the MOUNTAINEER 1 capacity resource. — Sheet1 · confidence: high
- Parties: [{"relationship":"Facility owner","name":"American Electric Power","official_url":"https://www.aep.com"},{"relationship":"Unit owner and facility operator","name":"Appalachian Power Company","official_url":"https://www.appalachianpower.com"},{"relationship":"Environmental services and CCR plan preparer","name":"American Electric Power Service Corporation","official_url":"https://www.aep.com"}] — Source · confidence: medium
- Parties: [{"relationship":"Facility owner","name":"American Electric Power","official_url":"https://www.aep.com"},{"relationship":"Unit owner and facility operator","name":"Appalachian Power Company","official_url":"https://www.appalachianpower.com"},{"relationship":"Environmental services and CCR plan preparer","name":"American Electric Power Service Corporation","official_url":"https://www.aep.com"}] — Source · confidence: medium
- Identifiers.0: {"value":"6264","system":"EIA plant ID"} — Form EIA-923, "Power Plant Operations Report" 2010 · confidence: medium
- Identifiers.3: {"value":"PJM","system":"ISO/RTO"} — Sheet1 · confidence: high
- Identifiers.4: {"value":"MOUNTAINEER 1","system":"PJM existing capacity resource"} — Sheet1 · confidence: high
- Identifiers.5: {"value":"053-00009","system":"West Virginia Title V operating permit"} — Title V Permits and Applications · confidence: high
- Parties.0: {"relationship":"Facility owner","name":"American Electric Power","official_url":"https://www.aep.com"} — Source · confidence: high
- Parties.1: {"relationship":"Unit owner and facility operator","name":"Appalachian Power Company","official_url":"https://www.appalachianpower.com"} — Source · confidence: high
- Parties.2: {"relationship":"Environmental services and CCR plan preparer","name":"American Electric Power Service Corporation","official_url":"https://www.aep.com"} — Source · confidence: medium
- Unit configuration: One coal-fired electric generating unit, Unit 1, nominally rated 1,300 MW — Source · confidence: high
- Power mw: 1300 — Source · confidence: high
- Unit count: 1 — Source · confidence: high
- Construction scope: One 1,300-MW pulverized-coal generating unit commissioned in 1980, with one Babcock & Wilcox boiler and an Alstom cross-compound turbine arrangement comprising two turbine shafts: one high-pressure turbine and two low-pressure turbines connected to one generator, plus one intermediate-pressure turbine and two additional low-pressure turbines connected to a second generator. The plant also includes a hyperbolic cooling tower, coal/material handling and unloading facilities, ancillary systems, an electrostatic precipitator, SCR, wet FGD, dry fly-ash handling, wet bottom-ash handling, and an approximately 20-MWe Alstom chilled-ammonia CO2-capture validation facility. — Source · confidence: medium
- Construction scope: One 1,300-MW pulverized-coal generating unit commissioned in 1980, with one Babcock & Wilcox boiler and an Alstom cross-compound turbine arrangement comprising two turbine shafts: one high-pressure turbine and two low-pressure turbines connected to one generator, plus one intermediate-pressure turbine and two additional low-pressure turbines connected to a second generator. The plant also includes a hyperbolic cooling tower, coal/material handling and unloading facilities, ancillary systems, an electrostatic precipitator, SCR, wet FGD, dry fly-ash handling, wet bottom-ash handling, and an approximately 20-MWe Alstom chilled-ammonia CO2-capture validation facility. — Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement · confidence: medium
- Construction scope: One 1,300-MW pulverized-coal generating unit commissioned in 1980, with one Babcock & Wilcox boiler and an Alstom cross-compound turbine arrangement comprising two turbine shafts: one high-pressure turbine and two low-pressure turbines connected to one generator, plus one intermediate-pressure turbine and two additional low-pressure turbines connected to a second generator. The plant also includes a hyperbolic cooling tower, coal/material handling and unloading facilities, ancillary systems, an electrostatic precipitator, SCR, wet FGD, dry fly-ash handling, wet bottom-ash handling, and an approximately 20-MWe Alstom chilled-ammonia CO2-capture validation facility. — Mountaineer Plant · confidence: medium
- Construction scope: One 1,300-MW pulverized-coal generating unit commissioned in 1980, with one Babcock & Wilcox boiler and an Alstom cross-compound turbine arrangement comprising two turbine shafts: one high-pressure turbine and two low-pressure turbines connected to one generator, plus one intermediate-pressure turbine and two additional low-pressure turbines connected to a second generator. The plant also includes a hyperbolic cooling tower, coal/material handling and unloading facilities, ancillary systems, an electrostatic precipitator, SCR, wet FGD, dry fly-ash handling, wet bottom-ash handling, and an approximately 20-MWe Alstom chilled-ammonia CO2-capture validation facility. — Source · confidence: medium
- Product url: https://www.alstom.com/press-releases-news/2013/4/alstom-to-furnish-steam-turbine-generator-for-tampa-electrics-polk-power-station — Alstom to furnish steam turbine generator for Tampa... · confidence: medium
- Manufacturer domain: alstom.com — Source · confidence: medium
- Equipment models.4: {"manufacturer_domain":null,"product_url":null,"count":2,"unit_mw":null,"name":"Electric generators in the cross-compound turbine arrangement"} — Source · confidence: medium
- Description: Mountaineer is a single-unit, nominally rated 1,300-MWe pulverized-coal plant near New Haven in Mason County, West Virginia. The plant began commercial operation in 1980 and is owned and operated by Appalachian Power Company. It remains an operating PJM coal resource. A 2009 chilled-ammonia carbon-capture and storage pilot was commissioned at the plant, while a larger 235-MWe CCS expansion was proposed but not completed. — Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement · confidence: medium
- Description: Mountaineer is a single-unit, nominally rated 1,300-MWe pulverized-coal plant near New Haven in Mason County, West Virginia. The plant began commercial operation in 1980 and is owned and operated by Appalachian Power Company. It remains an operating PJM coal resource. A 2009 chilled-ammonia carbon-capture and storage pilot was commissioned at the plant, while a larger 235-MWe CCS expansion was proposed but not completed. — Source · confidence: medium
- Quality notes: ["No Mountaineer-specific acquisition or sale consideration is disclosed in the cited records. AEP's approximately $2.1 billion January 2017 transaction was described as a portfolio sale of four competitive plants to Lightstone Generation and should not be attributed to Mountaineer.","The cited records establish commercial operation in 1980 but do not provide the plant's original construction start date or original construction financing.","The proposed 235-MWe CCS expansion was terminated after Phase I; the February 2026 DOE announcement establishes a planned Mountaineer upgrade but does not establish that the work had been completed."] — Source · confidence: medium
- Quality notes: ["No Mountaineer-specific acquisition or sale consideration is disclosed in the cited records. AEP's approximately $2.1 billion January 2017 transaction was described as a portfolio sale of four competitive plants to Lightstone Generation and should not be attributed to Mountaineer.","The cited records establish commercial operation in 1980 but do not provide the plant's original construction start date or original construction financing.","The proposed 235-MWe CCS expansion was terminated after Phase I; the February 2026 DOE announcement establishes a planned Mountaineer upgrade but does not establish that the work had been completed."] — Energy Department Announces $175 Million to Modernize Coal Plants, Keeping Affordable Reliable Power Online for Americans | Department of Energy · confidence: medium
- Financing summary: No project-finance loan or Mountaineer acquisition/sale consideration is disclosed. For the proposed Mountaineer CCS II expansion, DOE proposed up to $334 million of cost-shared financial assistance in 2010, described as approximately 50% of the estimated project cost. AEP notified DOE on 2011-07-07 that it would terminate the cooperative agreement at the end of Phase I because of unfavorable economic conditions and regulatory uncertainty. The separate January 2017 AEP portfolio sale to Lightstone Generation was approximately $2.1 billion for four competitive plants and is not identified as consideration for Mountaineer. — Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV · confidence: medium
- Timeline: [{"event":"Acquisition or sale history","date":null,"detail":"No Mountaineer-specific acquisition or sale transaction is identified. Appalachian Power is documented as the plant's owner and operator; the located January 2017 AEP transaction concerned a portfolio of four competitive plants sold to Lightstone Generation."},{"event":"Construction and commercial operation","date":"1980","detail":"The regulatory project description records Mountaineer beginning commercial operation in 1980 as a nominally rated 1,300-MWe pulverized-coal generating unit. A plant-level construction start date is not stated in the cited records."},{"event":"CCS pilot construction and commissioning","date":"2009-10-30","detail":"AEP and Alstom formally commissioned a chilled-ammonia carbon-capture and storage demonstration at Mountaineer; the pilot was designed to capture and store approximately 100,000 tonnes of CO2 annually."},{"event":"Proposed CCS expansion and DOE assistance","date":"2010-06","detail":"DOE's Mountaineer CCS II proposal contemplated a 235-MWe flue-gas slipstream system capturing approximately 1.5 million metric tonnes of CO2 annually. DOE proposed up to $334 million in cost-shared assistance, approximately half of estimated development cost."},{"event":"CCS expansion termination","date":"2011-07-07","detail":"AEP notified DOE that it intended to terminate the CCS II cooperative agreement at the end of Phase I, citing unfavorable economic conditions and regulatory uncertainty."},{"event":"CCS EIS cancellation","date":"2012-01-24","detail":"DOE published notice cancelling the environmental impact statement for the proposed Mountaineer commercial-scale CCS project after AEP's Phase I termination decision."},{"event":"Planned modernization","date":"2026-02-11","detail":"DOE announced that Appalachian Power would upgrade the Mountaineer Power Plant in Letart, West Virginia, as part of a broader program for coal-plant modernization. The announcement does not establish completion or repowering."},{"event":"Operating status","date":"2026-08-02","detail":"Mountaineer is reported as operational and generating electricity; no retirement date is identified in the cited records."}] — Source · confidence: medium
- Timeline: [{"event":"Acquisition or sale history","date":null,"detail":"No Mountaineer-specific acquisition or sale transaction is identified. Appalachian Power is documented as the plant's owner and operator; the located January 2017 AEP transaction concerned a portfolio of four competitive plants sold to Lightstone Generation."},{"event":"Construction and commercial operation","date":"1980","detail":"The regulatory project description records Mountaineer beginning commercial operation in 1980 as a nominally rated 1,300-MWe pulverized-coal generating unit. A plant-level construction start date is not stated in the cited records."},{"event":"CCS pilot construction and commissioning","date":"2009-10-30","detail":"AEP and Alstom formally commissioned a chilled-ammonia carbon-capture and storage demonstration at Mountaineer; the pilot was designed to capture and store approximately 100,000 tonnes of CO2 annually."},{"event":"Proposed CCS expansion and DOE assistance","date":"2010-06","detail":"DOE's Mountaineer CCS II proposal contemplated a 235-MWe flue-gas slipstream system capturing approximately 1.5 million metric tonnes of CO2 annually. DOE proposed up to $334 million in cost-shared assistance, approximately half of estimated development cost."},{"event":"CCS expansion termination","date":"2011-07-07","detail":"AEP notified DOE that it intended to terminate the CCS II cooperative agreement at the end of Phase I, citing unfavorable economic conditions and regulatory uncertainty."},{"event":"CCS EIS cancellation","date":"2012-01-24","detail":"DOE published notice cancelling the environmental impact statement for the proposed Mountaineer commercial-scale CCS project after AEP's Phase I termination decision."},{"event":"Planned modernization","date":"2026-02-11","detail":"DOE announced that Appalachian Power would upgrade the Mountaineer Power Plant in Letart, West Virginia, as part of a broader program for coal-plant modernization. The announcement does not establish completion or repowering."},{"event":"Operating status","date":"2026-08-02","detail":"Mountaineer is reported as operational and generating electricity; no retirement date is identified in the cited records."}] — Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement · confidence: medium
- Timeline: [{"event":"Acquisition or sale history","date":null,"detail":"No Mountaineer-specific acquisition or sale transaction is identified. Appalachian Power is documented as the plant's owner and operator; the located January 2017 AEP transaction concerned a portfolio of four competitive plants sold to Lightstone Generation."},{"event":"Construction and commercial operation","date":"1980","detail":"The regulatory project description records Mountaineer beginning commercial operation in 1980 as a nominally rated 1,300-MWe pulverized-coal generating unit. A plant-level construction start date is not stated in the cited records."},{"event":"CCS pilot construction and commissioning","date":"2009-10-30","detail":"AEP and Alstom formally commissioned a chilled-ammonia carbon-capture and storage demonstration at Mountaineer; the pilot was designed to capture and store approximately 100,000 tonnes of CO2 annually."},{"event":"Proposed CCS expansion and DOE assistance","date":"2010-06","detail":"DOE's Mountaineer CCS II proposal contemplated a 235-MWe flue-gas slipstream system capturing approximately 1.5 million metric tonnes of CO2 annually. DOE proposed up to $334 million in cost-shared assistance, approximately half of estimated development cost."},{"event":"CCS expansion termination","date":"2011-07-07","detail":"AEP notified DOE that it intended to terminate the CCS II cooperative agreement at the end of Phase I, citing unfavorable economic conditions and regulatory uncertainty."},{"event":"CCS EIS cancellation","date":"2012-01-24","detail":"DOE published notice cancelling the environmental impact statement for the proposed Mountaineer commercial-scale CCS project after AEP's Phase I termination decision."},{"event":"Planned modernization","date":"2026-02-11","detail":"DOE announced that Appalachian Power would upgrade the Mountaineer Power Plant in Letart, West Virginia, as part of a broader program for coal-plant modernization. The announcement does not establish completion or repowering."},{"event":"Operating status","date":"2026-08-02","detail":"Mountaineer is reported as operational and generating electricity; no retirement date is identified in the cited records."}] — AEP and Alstom Commission First of Its Kind Carbon Capture and Sequestration (CCS) Project; Project will capture and store approximately 100,000 tonnes of CO2 annually · confidence: medium
- Timeline: [{"event":"Acquisition or sale history","date":null,"detail":"No Mountaineer-specific acquisition or sale transaction is identified. Appalachian Power is documented as the plant's owner and operator; the located January 2017 AEP transaction concerned a portfolio of four competitive plants sold to Lightstone Generation."},{"event":"Construction and commercial operation","date":"1980","detail":"The regulatory project description records Mountaineer beginning commercial operation in 1980 as a nominally rated 1,300-MWe pulverized-coal generating unit. A plant-level construction start date is not stated in the cited records."},{"event":"CCS pilot construction and commissioning","date":"2009-10-30","detail":"AEP and Alstom formally commissioned a chilled-ammonia carbon-capture and storage demonstration at Mountaineer; the pilot was designed to capture and store approximately 100,000 tonnes of CO2 annually."},{"event":"Proposed CCS expansion and DOE assistance","date":"2010-06","detail":"DOE's Mountaineer CCS II proposal contemplated a 235-MWe flue-gas slipstream system capturing approximately 1.5 million metric tonnes of CO2 annually. DOE proposed up to $334 million in cost-shared assistance, approximately half of estimated development cost."},{"event":"CCS expansion termination","date":"2011-07-07","detail":"AEP notified DOE that it intended to terminate the CCS II cooperative agreement at the end of Phase I, citing unfavorable economic conditions and regulatory uncertainty."},{"event":"CCS EIS cancellation","date":"2012-01-24","detail":"DOE published notice cancelling the environmental impact statement for the proposed Mountaineer commercial-scale CCS project after AEP's Phase I termination decision."},{"event":"Planned modernization","date":"2026-02-11","detail":"DOE announced that Appalachian Power would upgrade the Mountaineer Power Plant in Letart, West Virginia, as part of a broader program for coal-plant modernization. The announcement does not establish completion or repowering."},{"event":"Operating status","date":"2026-08-02","detail":"Mountaineer is reported as operational and generating electricity; no retirement date is identified in the cited records."}] — Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV · confidence: medium
- Timeline: [{"event":"Acquisition or sale history","date":null,"detail":"No Mountaineer-specific acquisition or sale transaction is identified. Appalachian Power is documented as the plant's owner and operator; the located January 2017 AEP transaction concerned a portfolio of four competitive plants sold to Lightstone Generation."},{"event":"Construction and commercial operation","date":"1980","detail":"The regulatory project description records Mountaineer beginning commercial operation in 1980 as a nominally rated 1,300-MWe pulverized-coal generating unit. A plant-level construction start date is not stated in the cited records."},{"event":"CCS pilot construction and commissioning","date":"2009-10-30","detail":"AEP and Alstom formally commissioned a chilled-ammonia carbon-capture and storage demonstration at Mountaineer; the pilot was designed to capture and store approximately 100,000 tonnes of CO2 annually."},{"event":"Proposed CCS expansion and DOE assistance","date":"2010-06","detail":"DOE's Mountaineer CCS II proposal contemplated a 235-MWe flue-gas slipstream system capturing approximately 1.5 million metric tonnes of CO2 annually. DOE proposed up to $334 million in cost-shared assistance, approximately half of estimated development cost."},{"event":"CCS expansion termination","date":"2011-07-07","detail":"AEP notified DOE that it intended to terminate the CCS II cooperative agreement at the end of Phase I, citing unfavorable economic conditions and regulatory uncertainty."},{"event":"CCS EIS cancellation","date":"2012-01-24","detail":"DOE published notice cancelling the environmental impact statement for the proposed Mountaineer commercial-scale CCS project after AEP's Phase I termination decision."},{"event":"Planned modernization","date":"2026-02-11","detail":"DOE announced that Appalachian Power would upgrade the Mountaineer Power Plant in Letart, West Virginia, as part of a broader program for coal-plant modernization. The announcement does not establish completion or repowering."},{"event":"Operating status","date":"2026-08-02","detail":"Mountaineer is reported as operational and generating electricity; no retirement date is identified in the cited records."}] — Energy Department Announces $175 Million to Modernize Coal Plants, Keeping Affordable Reliable Power Online for Americans | Department of Energy · confidence: medium
- Timeline.0: {"event":"Acquisition or sale history","date":null,"detail":"No Mountaineer-specific acquisition or sale transaction is identified. Appalachian Power is documented as the plant's owner and operator; the located January 2017 AEP transaction concerned a portfolio of four competitive plants sold to Lightstone Generation."} — Source · confidence: medium
- Timeline.1: {"event":"Construction and commercial operation","date":"1980","detail":"The regulatory project description records Mountaineer beginning commercial operation in 1980 as a nominally rated 1,300-MWe pulverized-coal generating unit. A plant-level construction start date is not stated in the cited records."} — Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement · confidence: high
- Timeline.2: {"event":"CCS pilot construction and commissioning","date":"2009-10-30","detail":"AEP and Alstom formally commissioned a chilled-ammonia carbon-capture and storage demonstration at Mountaineer; the pilot was designed to capture and store approximately 100,000 tonnes of CO2 annually."} — AEP and Alstom Commission First of Its Kind Carbon Capture and Sequestration (CCS) Project; Project will capture and store approximately 100,000 tonnes of CO2 annually · confidence: medium
- Timeline.3: {"event":"Proposed CCS expansion and DOE assistance","date":"2010-06","detail":"DOE's Mountaineer CCS II proposal contemplated a 235-MWe flue-gas slipstream system capturing approximately 1.5 million metric tonnes of CO2 annually. DOE proposed up to $334 million in cost-shared assistance, approximately half of estimated development cost."} — Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement · confidence: high
- Timeline.4: {"event":"CCS expansion termination","date":"2011-07-07","detail":"AEP notified DOE that it intended to terminate the CCS II cooperative agreement at the end of Phase I, citing unfavorable economic conditions and regulatory uncertainty."} — Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV · confidence: high
- Timeline.5: {"event":"CCS EIS cancellation","date":"2012-01-24","detail":"DOE published notice cancelling the environmental impact statement for the proposed Mountaineer commercial-scale CCS project after AEP's Phase I termination decision."} — Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV · confidence: high
- Timeline.6: {"event":"Planned modernization","date":"2026-02-11","detail":"DOE announced that Appalachian Power would upgrade the Mountaineer Power Plant in Letart, West Virginia, as part of a broader program for coal-plant modernization. The announcement does not establish completion or repowering."} — Energy Department Announces $175 Million to Modernize Coal Plants, Keeping Affordable Reliable Power Online for Americans | Department of Energy · confidence: medium
- Commercial parties.0: {"relationship":"Unit owner and facility operator","name":"Appalachian Power Company","detail":"Appalachian Power owns and operates the Mountaineer Plant and is the named utility associated with the PJM resource.","official_url":"https://www.appalachianpower.com"} — Source · confidence: high
- Commercial parties.1: {"relationship":"Parent utility and CCS sponsor","name":"American Electric Power","detail":"AEP identifies Mountaineer as its plant and sponsored the carbon-capture demonstration and proposed CCS expansion; Appalachian Power is the named plant owner/operator.","official_url":"https://www.aep.com"} — AEP and Alstom Commission First of Its Kind Carbon Capture and Sequestration (CCS) Project; Project will capture and store approximately 100,000 tonnes of CO2 annually · confidence: medium
- Commercial parties.3: {"relationship":"CCS technology partner","name":"Alstom","detail":"Alstom partnered with AEP on the 2009 Mountaineer demonstration and supplied the chilled-ammonia CO2-capture technology.","official_url":"https://www.alstom.com"} — AEP and Alstom Commission First of Its Kind Carbon Capture and Sequestration (CCS) Project; Project will capture and store approximately 100,000 tonnes of CO2 annually · confidence: high
- Commercial parties.4: {"relationship":"Federal funding agency","name":"U.S. Department of Energy","detail":"DOE selected the proposed Mountaineer CCS II project under the Clean Coal Power Initiative and proposed cost-shared financial assistance of up to $334 million.","official_url":"https://www.energy.gov"} — Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV · confidence: high
- Quality notes.0: No Mountaineer-specific acquisition or sale consideration is disclosed in the cited records. AEP's approximately $2.1 billion January 2017 transaction was described as a portfolio sale of four competitive plants to Lightstone Generation and should not be attributed to Mountaineer. — Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV · confidence: medium
- Quality notes.1: The cited records establish commercial operation in 1980 but do not provide the plant's original construction start date or original construction financing. — Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement · confidence: medium
- Quality notes.2: The proposed 235-MWe CCS expansion was terminated after Phase I; the February 2026 DOE announcement establishes a planned Mountaineer upgrade but does not establish that the work had been completed. — Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement · confidence: high
- Quality notes.2: The proposed 235-MWe CCS expansion was terminated after Phase I; the February 2026 DOE announcement establishes a planned Mountaineer upgrade but does not establish that the work had been completed. — Energy Department Announces $175 Million to Modernize Coal Plants, Keeping Affordable Reliable Power Online for Americans | Department of Energy · confidence: high

## Timeline

- 1980 — Construction and commercial operation
  The regulatory project description records Mountaineer beginning commercial operation in 1980 as a nominally rated 1,300-MWe pulverized-coal generating unit. A plant-level construction start date is not stated in the cited records.
  Source: Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement (https://www.federalregister.gov/documents/2010/06/07/2010-13568/american-electric-power-service-corporations-mountaineer-commercial-scale-carbon-capture-and-storage)
- 2009-10-30 — CCS pilot construction and commissioning
  AEP and Alstom formally commissioned a chilled-ammonia carbon-capture and storage demonstration at Mountaineer; the pilot was designed to capture and store approximately 100,000 tonnes of CO2 annually.
  Source: AEP and Alstom Commission First of Its Kind Carbon Capture and Sequestration (CCS) Project; Project will capture and store approximately 100,000 tonnes of CO2 annually (https://www.aep.com/news/releases/read/1096/AEP-and-Alstom-Commission-First-of-Its-Kind-Carbon-Capture-and-Sequestration-CCS-Project-Project-will-capture-and-store-approximately-100000-tonnes-of-CO2-annually/)
- 2010-06 — Proposed CCS expansion and DOE assistance
  DOE's Mountaineer CCS II proposal contemplated a 235-MWe flue-gas slipstream system capturing approximately 1.5 million metric tonnes of CO2 annually. DOE proposed up to $334 million in cost-shared assistance, approximately half of estimated development cost.
  Source: Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement (https://www.federalregister.gov/documents/2010/06/07/2010-13568/american-electric-power-service-corporations-mountaineer-commercial-scale-carbon-capture-and-storage)
- 2011-07-07 — CCS expansion termination
  AEP notified DOE that it intended to terminate the CCS II cooperative agreement at the end of Phase I, citing unfavorable economic conditions and regulatory uncertainty.
  Source: Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV (https://www.federalregister.gov/documents/2012/01/24/2012-1351/cancellation-of-the-environmental-impact-statement-for-the-mountaineer-commercial-scale-carbon)
- 2012-01-24 — CCS EIS cancellation
  DOE published notice cancelling the environmental impact statement for the proposed Mountaineer commercial-scale CCS project after AEP's Phase I termination decision.
  Source: Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV (https://www.federalregister.gov/documents/2012/01/24/2012-1351/cancellation-of-the-environmental-impact-statement-for-the-mountaineer-commercial-scale-carbon)
- 2026-02-11 — Planned modernization
  DOE announced that Appalachian Power would upgrade the Mountaineer Power Plant in Letart, West Virginia, as part of a broader program for coal-plant modernization. The announcement does not establish completion or repowering.
  Source: Energy Department Announces $175 Million to Modernize Coal Plants, Keeping Affordable Reliable Power Online for Americans | Department of Energy (https://www.energy.gov/articles/energy-department-announces-175-million-modernize-coal-plants-keeping-affordable-reliable)

## Sources

- [AEP.com](https://www.aep.com/) — aep.com · tier other
- [Form EIA-923, "Power Plant Operations Report" 2010](https://downloads.regulations.gov/EPA-R04-OAR-2010-0935-0018/attachment_37.pdf) — downloads.regulations.gov · tier regulatory
- [Sheet1](https://www.pjm.com/-/media/DotCom/markets-ops/rpm/rpm-auction-info/2026-2027/2026-2027-rpm-existing-resource-list-post.xlsx) — pjm.com · tier other
- [Title V Permits and Applications](https://dep.wv.gov/daq/permitting/titlevpermits/Pages/default.aspx) — dep.wv.gov · tier regulatory
- [Mountaineer Plant](https://www.aep.com/environment/ccr/mountaineer) — aep.com · tier other
- [Source](https://docs.aep.com/docs/requiredpostings/ccr/2022/4-14-2022/MT-BAP-LF-FugitiveDustPlan-04132022.pdf) — docs.aep.com · tier other
- [Source](https://docs.aep.com/docs/requiredpostings/ccr/2020/10-26-2020/MT-FugitiveDustRpt-09302020.pdf) — docs.aep.com · tier other
- [AEP´S MOUNTAINEER PLANT WINS ENVIRONMENTAL LEADERSHIP AWARD](https://www.appalachianpower.com/company/news/view?releaseID=413) — appalachianpower.com · tier other
- [Source](https://psc.ky.gov/pscecf/2014-00396/slsharp%40aep.com/02112015102754/AG_1_304_Attachment2.pdf) — psc.ky.gov · tier regulatory
- [Federal Register :: American Electric Power Service Corporation's Mountaineer Commercial Scale Carbon Capture and Storage Project: Mason County, WV; Notice of Intent To Prepare an Environmental Impact Statement and Potential Floodplain and Wetlands Involvement](https://www.federalregister.gov/documents/2010/06/07/2010-13568/american-electric-power-service-corporations-mountaineer-commercial-scale-carbon-capture-and-storage) — federalregister.gov · tier regulatory
- [Mountaineer Plant](https://www.aep.com/environment/ccr/mountaineer/) — aep.com · tier other
- [Source](https://www.mcilvainecompany.com/Decision_Tree/subscriber/CO2DescriptionTextLinks/AlstomMountaineer.pdf) — mcilvainecompany.com · tier other
- [Alstom to furnish steam turbine generator for Tampa ...](https://www.alstom.com/press-releases-news/2013/4/alstom-to-furnish-steam-turbine-generator-for-tampa-electrics-polk-power-station) — alstom.com · tier other
- [AEP and Alstom Commission First of Its Kind Carbon Capture and Sequestration (CCS) Project; Project will capture and store approximately 100,000 tonnes of CO2 annually](https://www.aep.com/news/releases/read/1096/AEP-and-Alstom-Commission-First-of-Its-Kind-Carbon-Capture-and-Sequestration-CCS-Project-Project-will-capture-and-store-approximately-100000-tonnes-of-CO2-annually/) — aep.com · tier other
- [HISTORY OF CONSTRUCTION](https://docs.aep.com/docs/requiredpostings/ccr/2016/HistoryofDesignandConstruction/MT-BAP-History-101616.pdf) — docs.aep.com · tier other
- [Energy Department Announces $175 Million to Modernize ...](https://www.energy.gov/articles/energy-department-announces-175-million-modernize-coal-plants-keeping-affordable-reliable) — energy.gov · tier regulatory
- [Federal Register :: Cancellation of the Environmental Impact Statement for the Mountaineer Commercial Scale Carbon Capture and Storage Project, Mason County, WV](https://www.federalregister.gov/documents/2012/01/24/2012-1351/cancellation-of-the-environmental-impact-statement-for-the-mountaineer-commercial-scale-carbon) — federalregister.gov · tier regulatory
- [AEP to Sell Kentucky Operations to Liberty, Subsidiary of Algonquin Power and Utilities](https://www.aep.com/news/releases/read/7276/AEP-to-Sell-Kentucky-Operations-to-Liberty-Subsidiary-of-Algonquin-Power--Utilities?_sp=b485f50e-907d-4eba-8510-60f330cb20f7) — aep.com · tier other
- [Source](https://docs.aep.com/docs/investors/fercfilings/docs/2024/Appalachian%20Power%20Company%202024%20FF1.pdf) — docs.aep.com · tier other
- [Appalachian Power to use helicopters to maintain some power line rights-of-way](https://www.appalachianpower.com/company/news/view?releaseID=9531) — appalachianpower.com · tier other
- [Appalachian Power files to update environmental compliance surcharge rates](https://www.appalachianpower.com/company/news/view?releaseID=9168) — appalachianpower.com · tier other
- [West Virginia PSC Approves Continued Operation of Three AEP Coal Power Plants Through 2040](https://www.powermag.com/west-virginia-psc-approves-continued-operation-of-three-aep-coal-power-plants-through-2040/) — powermag.com · tier other
- [Appalachian Power May Stop Burning Coal By 2035](https://wvpublic.org/story/energy-environment/appalachian-power-may-stop-burning-coal-by-2035/) — wvpublic.org · tier other

## Data quality

- No Mountaineer-specific acquisition or sale consideration is disclosed in the cited records. AEP's approximately $2.1 billion January 2017 transaction was described as a portfolio sale of four competitive plants to Lightstone Generation and should not be attributed to Mountaineer. The cited records establish commercial operation in 1980 but do not provide the plant's original construction start date or original construction financing. The proposed 235-MWe CCS expansion was terminated after Phase I; the February 2026 DOE announcement establishes a planned Mountaineer upgrade but does not establish that the work had been completed.

---

Canonical page: https://askthegrid.com/assets/facilities/mountaineer

Source: Ask the Grid — https://askthegrid.com/