# Herbert A Wagner

PJM Petroleum Liquids · https://askthegrid.com/assets/facilities/herbert-a-wagner

Herbert A Wagner is a petroleum liquids facility with 773.7 MW of EIA-reported nameplate capacity in Anne Arundel County, Maryland, registered as EIA Plant ID 1554. H. A. Wagner LLC owns and operates the plant. The plant began commercial operation in 1966.

## Key facts

- Technology: Petroleum Liquids
- Power capacity: 773.7 MW
- Commercial operation: 1956
- Operating status: operating

## Grid and market context

- ISO/RTO: PJM
- Balancing authority: PJM
- Substation: Wagner Substation
- Point of interconnection: Wagner Substation
- Transmission owner: Baltimore Gas and Electric Company (BGE)

## Source-backed facts

- Owner logo domain: talenenergy.com — H.A. Wagner Generating Station - Talen Energy · confidence: high
- Owner name: H.A. Wagner LLC, a wholly owned subsidiary of Talen Energy Corporation — Source · confidence: high
- Identifiers.4: {"value":"PJM","system":"ISO/RTO"} — Source · confidence: high
- Identifiers.5: {"value":"PJM-BGE","system":"PJM market location"} — H.A. Wagner Generating Station - Talen Energy · confidence: high
- Parties.0: {"relationship":"Legal owner and operator","name":"H.A. Wagner LLC","official_url":null} — Source · confidence: high
- Parties.1: {"relationship":"Parent company","name":"Talen Energy Corporation","official_url":"https://www.talenenergy.com/"} — Source · confidence: high
- Parties.4: {"relationship":"Federal regulatory authority","name":"Federal Energy Regulatory Commission","official_url":"https://www.ferc.gov/"} — eLibrary | Docket Search Results · confidence: high
- Power mw: 702 — H.A. Wagner Generating Station - Talen Energy · confidence: medium
- Unit count: 2 — H.A. Wagner Generating Station - Talen Energy · confidence: high
- Construction scope: The exact Herbert A Wagner asset comprises two steam-electric generating units, Units 3 and 4. Each unit has one explicitly identified Babcock & Wilcox boiler: Unit 3 is a once-through supercritical coal-fired steam boiler rated at 2,740 MMBtu/hr, and Unit 4 is a dry-bottom wall-fired No. 6 fuel-oil steam boiler rated at 4,200 MMBtu/hr. Unit 3 is approximately 305 MW summer capacity and Unit 4 approximately 397 MW summer capacity. Unit 3 is also reported with a Westinghouse double-reheat cross-compound turbine. — Source · confidence: medium
- Construction scope: The exact Herbert A Wagner asset comprises two steam-electric generating units, Units 3 and 4. Each unit has one explicitly identified Babcock & Wilcox boiler: Unit 3 is a once-through supercritical coal-fired steam boiler rated at 2,740 MMBtu/hr, and Unit 4 is a dry-bottom wall-fired No. 6 fuel-oil steam boiler rated at 4,200 MMBtu/hr. Unit 3 is approximately 305 MW summer capacity and Unit 4 approximately 397 MW summer capacity. Unit 3 is also reported with a Westinghouse double-reheat cross-compound turbine. — Source · confidence: medium
- Product url: https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers — Large-Scale Utility Boiler Manufacturer · confidence: medium
- Kind: thermal — Source · confidence: high
- Manufacturer domain: babcock.com — Large-Scale Utility Boiler Manufacturer · confidence: medium
- Equipment models: [{"manufacturer_domain":"babcock.com","product_url":"https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers","count":1,"unit_mw":305,"name":"Babcock & Wilcox once-through supercritical steam boiler — Unit 3"},{"manufacturer_domain":"babcock.com","product_url":"https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers","count":1,"unit_mw":397,"name":"Babcock & Wilcox dry-bottom wall-fired No. 6 fuel-oil steam boiler — Unit 4"},{"manufacturer_domain":"westinghouse.com","product_url":null,"count":1,"unit_mw":null,"name":"Westinghouse double-reheat cross-compound steam turbine — Unit 3"}] — Source · confidence: medium
- Equipment models: [{"manufacturer_domain":"babcock.com","product_url":"https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers","count":1,"unit_mw":305,"name":"Babcock & Wilcox once-through supercritical steam boiler — Unit 3"},{"manufacturer_domain":"babcock.com","product_url":"https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers","count":1,"unit_mw":397,"name":"Babcock & Wilcox dry-bottom wall-fired No. 6 fuel-oil steam boiler — Unit 4"},{"manufacturer_domain":"westinghouse.com","product_url":null,"count":1,"unit_mw":null,"name":"Westinghouse double-reheat cross-compound steam turbine — Unit 3"}] — Herbert A. Wagner Generating Station - Wikipedia · confidence: medium
- Manufacturer name: Babcock & Wilcox — Source · confidence: medium
- Equipment models.0: {"manufacturer_domain":"babcock.com","product_url":"https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers","count":1,"unit_mw":305,"name":"Babcock & Wilcox once-through supercritical steam boiler — Unit 3"} — Source · confidence: medium
- Equipment models.1: {"manufacturer_domain":"babcock.com","product_url":"https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers","count":1,"unit_mw":397,"name":"Babcock & Wilcox dry-bottom wall-fired No. 6 fuel-oil steam boiler — Unit 4"} — Source · confidence: medium
- Equipment models.1: {"manufacturer_domain":"babcock.com","product_url":"https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers","count":1,"unit_mw":397,"name":"Babcock & Wilcox dry-bottom wall-fired No. 6 fuel-oil steam boiler — Unit 4"} — Source · confidence: medium
- Equipment models.2: {"manufacturer_domain":"westinghouse.com","product_url":null,"count":1,"unit_mw":null,"name":"Westinghouse double-reheat cross-compound steam turbine — Unit 3"} — Herbert A. Wagner Generating Station - Wikipedia · confidence: low
- Quality notes: ["Capacity figures use different scopes: Talen lists 702 MW for the two-unit active oil configuration, while other records describe the broader historical Wagner facility at approximately 840–844 MW; the figures should not be treated as interchangeable.","The 2012 transaction has multiple reported values: Exelon's announcement cited approximately $400 million, while Raven's SEC acquisition accounting reported $383 million of cash consideration and a Maryland regulatory filing cited $371 million in net proceeds. These are transaction-level figures, not a separate station construction-financing amount.","The station's documented major modification was conversion of Unit 3 from coal to fuel oil, completed at the end of 2023."] — H.A. Wagner Generating Station - Talen Energy · confidence: medium
- Quality notes: ["Capacity figures use different scopes: Talen lists 702 MW for the two-unit active oil configuration, while other records describe the broader historical Wagner facility at approximately 840–844 MW; the figures should not be treated as interchangeable.","The 2012 transaction has multiple reported values: Exelon's announcement cited approximately $400 million, while Raven's SEC acquisition accounting reported $383 million of cash consideration and a Maryland regulatory filing cited $371 million in net proceeds. These are transaction-level figures, not a separate station construction-financing amount.","The station's documented major modification was conversion of Unit 3 from coal to fuel oil, completed at the end of 2023."] — May 20, 2026 The Honorable Chris Wright Secretary of Energy... · confidence: medium
- Timeline.0: {"event":"Unit 1 construction and commercial operation","date":"1956","detail":"Historical records identify Wagner Unit 1 as a coal-fired unit built in 1956."} — PJM requests delayed retirement of Maryland fossil-fired units, citing reliability concerns · confidence: medium
- Timeline.1: {"event":"Unit 3 construction and commercial operation","date":"1966","detail":"Wagner Unit 3 was completed or commissioned in 1966; it was originally coal-fired and later converted to fuel oil."} — Talen, PJM Reach Agreement to Keep 2 GW of Coal, Oil Generation Online for Reliability in Maryland · confidence: high
- Timeline.2: {"event":"Unit 4 construction and commercial operation","date":"1972","detail":"Wagner Unit 4 was commissioned in 1972 as an oil-fired generation unit."} — Talen, PJM Reach Agreement to Keep 2 GW of Coal, Oil Generation Online for Reliability in Maryland · confidence: high
- Timeline.8: {"event":"Unit 2 retirement","date":"2020","detail":"The 136 MW coal-fired Wagner Unit 2 was retired."} — PJM requests delayed retirement of Maryland fossil-fired units, citing reliability concerns · confidence: high
- Timeline.10: {"event":"Unit 3 fuel conversion","date":"2023-12","detail":"Talen converted the coal-fired Wagner Unit 3 to run on fuel oil at the end of 2023."} — Talen, PJM Reach Agreement to Keep 2 GW of Coal, Oil Generation Online for Reliability in Maryland · confidence: high
- Timeline.10: {"event":"Unit 3 fuel conversion","date":"2023-12","detail":"Talen converted the coal-fired Wagner Unit 3 to run on fuel oil at the end of 2023."} — Date · confidence: high
- Timeline.11: {"event":"FERC RMR filing","date":"2024-04-18","detail":"H.A. Wagner LLC filed a continuing-operations rate schedule with FERC for reliability-must-run service from Units 3 and 4 under Docket ER24-1787."} — eLibrary | Docket Search Results · confidence: high
- Timeline.12: {"event":"RMR settlement announced","date":"2025-01-27","detail":"Talen, PJM, Maryland regulators, utilities, and consumer representatives reached an agreement to keep Wagner Units 3 and 4 operating beyond their scheduled May 31, 2025 retirement date."} — Talen Energy, Other Parties Reach Reliability Must Run Settlement Agreement for Brandon Shores and H.A. Wagner Power Plants | Mon, 01/27/2025 - 16:26 · confidence: high
- Commercial parties.0: {"relationship":"Legal owner and operator","name":"H.A. Wagner LLC","detail":"Owns and operates Wagner Units 3 and 4 and filed the FERC continuing-operations rate schedule for the RMR service.","official_url":null} — Source · confidence: high
- Commercial parties.0: {"relationship":"Legal owner and operator","name":"H.A. Wagner LLC","detail":"Owns and operates Wagner Units 3 and 4 and filed the FERC continuing-operations rate schedule for the RMR service.","official_url":null} — H.A. Wagner Generating Station - Talen Energy · confidence: high

## Timeline

- 1956 — Unit 1 construction and commercial operation
  Historical records identify Wagner Unit 1 as a coal-fired unit built in 1956.
  Source: PJM requests delayed retirement of Maryland fossil-fired units, citing reliability concerns (https://www.power-eng.com/coal/pjm-requests-delayed-retirement-of-maryland-fossil-fired-units-citing-reliability-concerns/)
- 1966 — Unit 3 construction and commercial operation
  Wagner Unit 3 was completed or commissioned in 1966; it was originally coal-fired and later converted to fuel oil.
  Source: PJM requests delayed retirement of Maryland fossil-fired units, citing reliability concerns (https://www.power-eng.com/coal/pjm-requests-delayed-retirement-of-maryland-fossil-fired-units-citing-reliability-concerns/)
- 1972 — Unit 4 construction and commercial operation
  Wagner Unit 4 was commissioned in 1972 as an oil-fired generation unit.
  Source: May 20, 2026 The Honorable Chris Wright Secretary of Energy United States Department of Energy 1000 Independence Avenue, SW Washington, (https://www.pjm.com/-/media/DotCom/documents/other-fed-state/20260520-wagner-3-and-4-202c-request.pdf)
- 2015-06 — Talen Energy formation and ownership transition
  Talen Energy was established through the combination of PPL's competitive-generation assets with Riverstone's RJS Power business, which included the Raven Power facilities.
  Source: Source (https://www.sec.gov/Archives/edgar/data/1622536/000119312515166051/d803056d424b3.htm)
- 2020 — Unit 2 retirement
  The 136 MW coal-fired Wagner Unit 2 was retired.
  Source: PJM requests delayed retirement of Maryland fossil-fired units, citing reliability concerns (https://www.power-eng.com/coal/pjm-requests-delayed-retirement-of-maryland-fossil-fired-units-citing-reliability-concerns/)
- 2023-10-16 — Deactivation notice
  Wagner notified PJM of its intent to retire Units 1, 3, 4, and the combustion turbine effective June 1, 2025.
  Source: May 20, 2026 The Honorable Chris Wright Secretary of Energy United States Department of Energy 1000 Independence Avenue, SW Washington, (https://www.pjm.com/-/media/DotCom/documents/other-fed-state/20260520-wagner-3-and-4-202c-request.pdf)
- 2023-12 — Unit 3 fuel conversion
  Talen converted the coal-fired Wagner Unit 3 to run on fuel oil at the end of 2023.
  Source: PJM requests delayed retirement of Maryland fossil-fired units, citing reliability concerns (https://www.power-eng.com/coal/pjm-requests-delayed-retirement-of-maryland-fossil-fired-units-citing-reliability-concerns/)

## Sources

- [H.A. Wagner Generating Station - Talen Energy](https://www.talenenergy.com/plant/h-a-wagner-generating-station/) — talenenergy.com · tier other
- [Electric Power Monthly - U.S. Energy Information Administration (EIA)](https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_6_06) — eia.gov · tier regulatory
- [eLibrary | Docket Search Results](https://elibrary.ferc.gov/eLibrary/docketsheet?docket_number=ER24-1787) — elibrary.ferc.gov · tier regulatory
- [May 20, 2026 The Honorable Chris Wright Secretary of Energy United States Department of Energy 1000 Independence Avenue, SW Washington,](https://www.pjm.com/-/media/DotCom/documents/other-fed-state/20260520-wagner-3-and-4-202c-request.pdf) — pjm.com · tier other
- [Source](https://pjm.com/-/media/DotCom/documents/other-fed-state/20260520-wagner-3-and-4-202c-request.pdf) — pjm.com · tier other
- [Source](https://downloads.regulations.gov/EPA-R03-OAR-2024-0152-0015/content.pdf) — downloads.regulations.gov · tier regulatory
- [Large-Scale Utility Boiler Manufacturer](https://www.babcock.com/home/products-services/steam-generators/utility-scale-boilers) — babcock.com · tier other
- [Herbert A. Wagner Generating Station - Wikipedia](https://en.wikipedia.org/wiki/Herbert_A._Wagner_Generating_Station) — en.wikipedia.org · tier other
- [FERC Approves Reliability Must Run Settlement Agreement for Units at Talen Energy’s Brandon Shores and H.A. Wagner Power Plants | Thu, 05/01/2025 - 18:00](https://ir.talenenergy.com/news-releases/news-release-details/ferc-approves-reliability-must-run-settlement-agreement-units) — ir.talenenergy.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/1622536/000119312515166051/d803056d424b3.htm) — sec.gov · tier regulatory
- [PJM requests delayed retirement of Maryland fossil-fired units, citing reliability concerns](https://www.power-eng.com/coal/pjm-requests-delayed-retirement-of-maryland-fossil-fired-units-citing-reliability-concerns/) — power-eng.com · tier other
- [Talen, PJM Reach Agreement to Keep 2 GW of Coal, Oil Generation Online for Reliability in Maryland](https://www.powermag.com/talen-pjm-reach-agreement-to-keep-2-gw-of-coal-oil-generation-online-for-reliability-in-maryland/) — powermag.com · tier other
- [Date](https://downloads.regulations.gov/EPA-R03-OAR-2022-0912-0040/content.pdf) — downloads.regulations.gov · tier regulatory
- [Talen Energy, Other Parties Reach Reliability Must Run Settlement Agreement for Brandon Shores and H.A. Wagner Power Plants | Mon, 01/27/2025 - 16:26](https://ir.talenenergy.com/news-releases/news-release-details/talen-energy-other-parties-reach-reliability-must-run-settlement) — ir.talenenergy.com · tier other
- [August 2025 Baltimore Load Shed Event RF Analysis](https://www.rfirst.org/wp-content/uploads/2025/10/August-2025-Baltimore-Load-Shed-Event-RF-Analysis.pdf) — rfirst.org · tier other

## Data quality

- Capacity figures use different scopes: Talen lists 702 MW for the two-unit active oil configuration, while other records describe the broader historical Wagner facility at approximately 840–844 MW; the figures should not be treated as interchangeable. The 2012 transaction has multiple reported values: Exelon's announcement cited approximately $400 million, while Raven's SEC acquisition accounting reported $383 million of cash consideration and a Maryland regulatory filing cited $371 million in net proceeds. These are transaction-level figures, not a separate station construction-financing amount. The station's documented major modification was conversion of Unit 3 from coal to fuel oil, completed at the end of 2023.

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