# Edge Moor

PJM Natural Gas Steam Turbine · https://askthegrid.com/assets/facilities/edge-moor

Edge Moor is a natural gas-fired power facility with 697.8 MW of EIA-reported nameplate capacity in New Castle County, Delaware, registered as EIA Plant ID 593. Edge Moor is a historically significant PJM coastal generation site: it is described as one of the first power stations built with a fully centralized control system, and the U.S. Department of Justice identifies it as a roughly 707 MW simple-cycle natural-gas plant included in the PJM divestiture package. The plant began commercial operation in 1965. Its grid role is dispatchable peaking generation; historical Calpine asset information characterizes the Edge Moor facility as natural-gas and oil-fired simple-cycle generation with peaking capacity.

## Key facts

- Technology: Natural Gas Steam Turbine
- Power capacity: 697.8 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: PJM
- Balancing authority: PJM (FERC PJME)
- Substation: Edge Moor substation
- Point of interconnection: Edge Moor substation
- Transmission owner: Delmarva Power & Light Company (DPL), an Exelon transmission-zone utility
- Interconnection voltage: 230 kV

## Source-backed facts

- Owner logo domain: constellationenergy.com — Who We Are · confidence: medium
- Owner logo domain: constellationenergy.com — Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction · confidence: medium
- Owner name: Constellation Energy Corporation, through its Calpine business unit — Who We Are · confidence: medium
- Description: Edge Moor is an operating gas-fired power plant in Wilmington, New Castle County, Delaware, at 200 Hay Road. EIA plant code 593 and FERC records place the facility in the PJM/PJME market and identify four generators: 3, 10, 4, and 5. The generators have recorded in-service dates spanning December 1954 through August 1973, and the facility is also identified as the Edge Moor Energy Center and a simple-cycle natural-gas plant. — Title V Permit Renewal Applications: Edge Moor Energy Center - DNREC · confidence: medium
- Parties: [{"relationship":"Current owner / parent company","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"},{"relationship":"Plant operator / EIA utility","name":"Calpine Mid-Atlantic Generation LLC","official_url":"https://www.calpine.com/"},{"relationship":"Air-permit applicant / registered facility entity","name":"First State Generation LLC","official_url":null},{"relationship":"Announced prospective acquirer; sale pending as of 2026-08-02","name":"LS Power","official_url":"https://www.lspower.com/"}] — Who We Are · confidence: medium
- Parties: [{"relationship":"Current owner / parent company","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"},{"relationship":"Plant operator / EIA utility","name":"Calpine Mid-Atlantic Generation LLC","official_url":"https://www.calpine.com/"},{"relationship":"Air-permit applicant / registered facility entity","name":"First State Generation LLC","official_url":null},{"relationship":"Announced prospective acquirer; sale pending as of 2026-08-02","name":"LS Power","official_url":"https://www.lspower.com/"}] — calpine corporation · confidence: medium
- Parties: [{"relationship":"Current owner / parent company","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"},{"relationship":"Plant operator / EIA utility","name":"Calpine Mid-Atlantic Generation LLC","official_url":"https://www.calpine.com/"},{"relationship":"Air-permit applicant / registered facility entity","name":"First State Generation LLC","official_url":null},{"relationship":"Announced prospective acquirer; sale pending as of 2026-08-02","name":"LS Power","official_url":"https://www.lspower.com/"}] — Title V Permit Renewal Applications: Edge Moor Energy Center - DNREC · confidence: medium
- Parties: [{"relationship":"Current owner / parent company","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"},{"relationship":"Plant operator / EIA utility","name":"Calpine Mid-Atlantic Generation LLC","official_url":"https://www.calpine.com/"},{"relationship":"Air-permit applicant / registered facility entity","name":"First State Generation LLC","official_url":null},{"relationship":"Announced prospective acquirer; sale pending as of 2026-08-02","name":"LS Power","official_url":"https://www.lspower.com/"}] — Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction · confidence: medium
- Identifiers.0: {"value":"593","system":"EIA plant ID"} — Who We Are · confidence: medium
- Identifiers.0: {"value":"593","system":"EIA plant ID"} — Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction · confidence: medium
- Parties.0: {"relationship":"Current owner / parent company","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"} — Who We Are · confidence: medium
- Parties.0: {"relationship":"Current owner / parent company","name":"Constellation Energy Corporation","official_url":"https://www.constellationenergy.com/"} — Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction · confidence: medium
- Parties.1: {"relationship":"Plant operator / EIA utility","name":"Calpine Mid-Atlantic Generation LLC","official_url":"https://www.calpine.com/"} — calpine corporation · confidence: medium
- Parties.2: {"relationship":"Air-permit applicant / registered facility entity","name":"First State Generation LLC","official_url":null} — Title V Permit Renewal Applications: Edge Moor Energy Center - DNREC · confidence: high
- Parties.3: {"relationship":"Announced prospective acquirer; sale pending as of 2026-08-02","name":"LS Power","official_url":"https://www.lspower.com/"} — Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction · confidence: high
- Interconnection: Edge Moor Substation; Delmarva Power (DPL) transmission zone/owner; PJM — Sub Regional RTEP Committee PJM Mid-Atlantic · confidence: medium
- Construction scope: Operating thermal generation facility at EIA plant 593 with four active generator units: Edge Moor Units 3, 4, 5, and 10. Units 3, 4, and 5 comprise three boilers and are reported at 75 MW, 176.8 MW, and 446 MW respectively; Unit 10 is reported at 12.5 MW and is a combustion-turbine unit. An asset listing identifies the Edge Moor turbine set as two GE steam turbines, one Westinghouse steam turbine, and one TP&M FT-4A-5. — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Manufacturer domain: gevernova.com; westinghousenuclear.com; power.mhi.com; siemens-energy.com — Utility steam turbines · confidence: medium
- Product family: GE steam turbine; Westinghouse steam turbine; TP&M FT-4A-5; Siemens Energy steam turbine — Utility steam turbines · confidence: medium
- Equipment models.3: {"manufacturer_domain":"power.mhi.com","product_url":"https://power.mhi.com/products/gasturbines","count":1,"unit_mw":null,"name":"TP&M FT-4A-5"} — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Equipment models.4: {"manufacturer_domain":"siemens-energy.com","product_url":"https://www.siemens-energy.com/global/en/home/products-services/product/utility-steam-turbines.html","count":1,"unit_mw":446,"name":"Siemens Energy steam turbine"} — Utility steam turbines · confidence: medium
- Significance: Edge Moor is a historically significant PJM coastal generation site: it is described as one of the first power stations built with a fully centralized control system, and the U.S. Department of Justice identifies it as a roughly 707 MW simple-cycle natural-gas plant included in the PJM divestiture package. — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Description: Edge Moor, also known as Edge Moor Energy Center, is an operating power facility at 200 Hay Road in Wilmington, New Castle County, Delaware, with four generators serving the PJM/PJME market. Current ownership is held by Constellation Energy Corporation through its Calpine business, with Calpine Mid-Atlantic Generation LLC associated with plant operations; a proposed sale to LS Power remained pending as of August 2, 2026. The site originated under Delmarva Power and later Conectiv Energy before Calpine acquired the generation fleet from Pepco Holdings on June 30, 2010. On July 1, 2010, Edge Moor began burning natural gas exclusively and discontinued coal generation. — Source · confidence: medium
- Description: Edge Moor, also known as Edge Moor Energy Center, is an operating power facility at 200 Hay Road in Wilmington, New Castle County, Delaware, with four generators serving the PJM/PJME market. Current ownership is held by Constellation Energy Corporation through its Calpine business, with Calpine Mid-Atlantic Generation LLC associated with plant operations; a proposed sale to LS Power remained pending as of August 2, 2026. The site originated under Delmarva Power and later Conectiv Energy before Calpine acquired the generation fleet from Pepco Holdings on June 30, 2010. On July 1, 2010, Edge Moor began burning natural gas exclusively and discontinued coal generation. — Source · confidence: medium
- Description: Edge Moor, also known as Edge Moor Energy Center, is an operating power facility at 200 Hay Road in Wilmington, New Castle County, Delaware, with four generators serving the PJM/PJME market. Current ownership is held by Constellation Energy Corporation through its Calpine business, with Calpine Mid-Atlantic Generation LLC associated with plant operations; a proposed sale to LS Power remained pending as of August 2, 2026. The site originated under Delmarva Power and later Conectiv Energy before Calpine acquired the generation fleet from Pepco Holdings on June 30, 2010. On July 1, 2010, Edge Moor began burning natural gas exclusively and discontinued coal generation. — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Description: Edge Moor, also known as Edge Moor Energy Center, is an operating power facility at 200 Hay Road in Wilmington, New Castle County, Delaware, with four generators serving the PJM/PJME market. Current ownership is held by Constellation Energy Corporation through its Calpine business, with Calpine Mid-Atlantic Generation LLC associated with plant operations; a proposed sale to LS Power remained pending as of August 2, 2026. The site originated under Delmarva Power and later Conectiv Energy before Calpine acquired the generation fleet from Pepco Holdings on June 30, 2010. On July 1, 2010, Edge Moor began burning natural gas exclusively and discontinued coal generation. — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Quality notes: ["Published capacity figures vary by rating and source: approximately 697.8 MW, 707 MW, and 710.3 MW are reported; approximately 707 MW is used for directory prose because it appears in the DOJ divestiture description.","Unit-level records list commercial-operation years of 1954, 1963, 1966, and 1973, while the DOJ divestiture description characterizes the plant as beginning commercial operations in 1965; these should not be collapsed into one unqualified date.","The $1.63 billion 2010 amount was consideration for the broader Conectiv generation fleet, and the $5 billion 2026 amount is consideration for a roughly 4.4 GW portfolio; neither is a standalone Edge Moor sale price.","The identified financing includes pooled pollution-control bonds and acquisition financing. No separate Edge Moor-only project-finance facility or Edge Moor-specific new-build repowering transaction is identified in the cited records."] — Source · confidence: medium
- Quality notes: ["Published capacity figures vary by rating and source: approximately 697.8 MW, 707 MW, and 710.3 MW are reported; approximately 707 MW is used for directory prose because it appears in the DOJ divestiture description.","Unit-level records list commercial-operation years of 1954, 1963, 1966, and 1973, while the DOJ divestiture description characterizes the plant as beginning commercial operations in 1965; these should not be collapsed into one unqualified date.","The $1.63 billion 2010 amount was consideration for the broader Conectiv generation fleet, and the $5 billion 2026 amount is consideration for a roughly 4.4 GW portfolio; neither is a standalone Edge Moor sale price.","The identified financing includes pooled pollution-control bonds and acquisition financing. No separate Edge Moor-only project-finance facility or Edge Moor-specific new-build repowering transaction is identified in the cited records."] — Source · confidence: medium
- Financing summary: In 1979, Delmarva Power received $17.7 million, with $17.678 million deposited as net proceeds, from 6.6% tax-exempt pollution-control bonds issued through Delaware for equipment at both the Indian River and Edge Moor stations; this was pooled station financing rather than Edge Moor-only debt. Calpine's June 30, 2010 acquisition of the Conectiv generation fleet had a final cash purchase price of approximately $1.63 billion plus approximately $49 million for fuel inventory and was funded with approximately $540 million of cash and $1.3 billion of bank debt under a June 8, 2010 credit agreement; Credit Suisse was the administrative agent, with Citi and Deutsche Bank involved in the financing. The March 18, 2026 $5 billion figure is portfolio sale consideration for approximately 4.4 GW to LS Power, not project financing or an Edge Moor standalone valuation. — Source · confidence: medium
- Timeline: [{"event":"Initial construction","date":"1951","detail":"The first two Edge Moor units were completed; those original units have since been retired."},{"event":"Unit 3 commercial operation","date":"1954","detail":"Unit 3 began commercial operation."},{"event":"Unit 10 commercial operation","date":"1963","detail":"Unit 10, a combustion-turbine unit, began commercial operation."},{"event":"Plant-level commercial-operation reference","date":"1965","detail":"The DOJ divestiture description characterizes Edge Moor as a 707 MW simple-cycle natural-gas plant that began commercial operations in 1965; unit-level records separately list earlier and later unit dates."},{"event":"Unit 4 commercial operation","date":"1966","detail":"Unit 4 began commercial operation."},{"event":"Unit 5 commercial operation","date":"1973","detail":"Unit 5 began commercial operation."},{"event":"Pollution-control financing","date":"1979","detail":"Delmarva Power received $17.7 million from tax-exempt pollution-control bonds for pollution-control equipment at the Indian River and Edge Moor stations."},{"event":"Emissions-control investment","date":"2009","detail":"Conectiv Energy installed water-injection pollution-control equipment on Edge Moor 10 and reported approximately $62 million of pollution-control equipment and enhancements at the Edge Moor facility through December 2009."},{"event":"Calpine acquisition announced","date":"2010-04-21","detail":"Calpine announced its agreement to purchase Pepco Holdings' 4,490 MW Conectiv Energy generation fleet for $1.65 billion plus adjustments; the fleet included Edge Moor."},{"event":"Calpine acquisition closed","date":"2010-06-30","detail":"Calpine completed the acquisition of Conectiv Energy's generation business from Pepco Holdings for approximately $1.63 billion in cash plus approximately $49 million for fuel inventory at closing."},{"event":"Fuel conversion and coal discontinuation","date":"2010-07-01","detail":"Edge Moor began burning natural gas exclusively and coal generation was discontinued. This is treated as a fuel-conversion milestone rather than a separately documented equipment repowering."},{"event":"Constellation acquisition of Calpine","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the parent company of Calpine's Edge Moor business."},{"event":"Proposed sale to LS Power","date":"2026-03-18","detail":"Constellation and LS Power announced a proposed sale including Edge Moor as part of a roughly 4.4 GW PJM portfolio valued at $5 billion before closing adjustments; closing was subject to regulatory approvals and expected later in 2026."}] — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Timeline: [{"event":"Initial construction","date":"1951","detail":"The first two Edge Moor units were completed; those original units have since been retired."},{"event":"Unit 3 commercial operation","date":"1954","detail":"Unit 3 began commercial operation."},{"event":"Unit 10 commercial operation","date":"1963","detail":"Unit 10, a combustion-turbine unit, began commercial operation."},{"event":"Plant-level commercial-operation reference","date":"1965","detail":"The DOJ divestiture description characterizes Edge Moor as a 707 MW simple-cycle natural-gas plant that began commercial operations in 1965; unit-level records separately list earlier and later unit dates."},{"event":"Unit 4 commercial operation","date":"1966","detail":"Unit 4 began commercial operation."},{"event":"Unit 5 commercial operation","date":"1973","detail":"Unit 5 began commercial operation."},{"event":"Pollution-control financing","date":"1979","detail":"Delmarva Power received $17.7 million from tax-exempt pollution-control bonds for pollution-control equipment at the Indian River and Edge Moor stations."},{"event":"Emissions-control investment","date":"2009","detail":"Conectiv Energy installed water-injection pollution-control equipment on Edge Moor 10 and reported approximately $62 million of pollution-control equipment and enhancements at the Edge Moor facility through December 2009."},{"event":"Calpine acquisition announced","date":"2010-04-21","detail":"Calpine announced its agreement to purchase Pepco Holdings' 4,490 MW Conectiv Energy generation fleet for $1.65 billion plus adjustments; the fleet included Edge Moor."},{"event":"Calpine acquisition closed","date":"2010-06-30","detail":"Calpine completed the acquisition of Conectiv Energy's generation business from Pepco Holdings for approximately $1.63 billion in cash plus approximately $49 million for fuel inventory at closing."},{"event":"Fuel conversion and coal discontinuation","date":"2010-07-01","detail":"Edge Moor began burning natural gas exclusively and coal generation was discontinued. This is treated as a fuel-conversion milestone rather than a separately documented equipment repowering."},{"event":"Constellation acquisition of Calpine","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the parent company of Calpine's Edge Moor business."},{"event":"Proposed sale to LS Power","date":"2026-03-18","detail":"Constellation and LS Power announced a proposed sale including Edge Moor as part of a roughly 4.4 GW PJM portfolio valued at $5 billion before closing adjustments; closing was subject to regulatory approvals and expected later in 2026."}] — Source · confidence: medium
- Timeline: [{"event":"Initial construction","date":"1951","detail":"The first two Edge Moor units were completed; those original units have since been retired."},{"event":"Unit 3 commercial operation","date":"1954","detail":"Unit 3 began commercial operation."},{"event":"Unit 10 commercial operation","date":"1963","detail":"Unit 10, a combustion-turbine unit, began commercial operation."},{"event":"Plant-level commercial-operation reference","date":"1965","detail":"The DOJ divestiture description characterizes Edge Moor as a 707 MW simple-cycle natural-gas plant that began commercial operations in 1965; unit-level records separately list earlier and later unit dates."},{"event":"Unit 4 commercial operation","date":"1966","detail":"Unit 4 began commercial operation."},{"event":"Unit 5 commercial operation","date":"1973","detail":"Unit 5 began commercial operation."},{"event":"Pollution-control financing","date":"1979","detail":"Delmarva Power received $17.7 million from tax-exempt pollution-control bonds for pollution-control equipment at the Indian River and Edge Moor stations."},{"event":"Emissions-control investment","date":"2009","detail":"Conectiv Energy installed water-injection pollution-control equipment on Edge Moor 10 and reported approximately $62 million of pollution-control equipment and enhancements at the Edge Moor facility through December 2009."},{"event":"Calpine acquisition announced","date":"2010-04-21","detail":"Calpine announced its agreement to purchase Pepco Holdings' 4,490 MW Conectiv Energy generation fleet for $1.65 billion plus adjustments; the fleet included Edge Moor."},{"event":"Calpine acquisition closed","date":"2010-06-30","detail":"Calpine completed the acquisition of Conectiv Energy's generation business from Pepco Holdings for approximately $1.63 billion in cash plus approximately $49 million for fuel inventory at closing."},{"event":"Fuel conversion and coal discontinuation","date":"2010-07-01","detail":"Edge Moor began burning natural gas exclusively and coal generation was discontinued. This is treated as a fuel-conversion milestone rather than a separately documented equipment repowering."},{"event":"Constellation acquisition of Calpine","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the parent company of Calpine's Edge Moor business."},{"event":"Proposed sale to LS Power","date":"2026-03-18","detail":"Constellation and LS Power announced a proposed sale including Edge Moor as part of a roughly 4.4 GW PJM portfolio valued at $5 billion before closing adjustments; closing was subject to regulatory approvals and expected later in 2026."}] — Source · confidence: medium
- Timeline: [{"event":"Initial construction","date":"1951","detail":"The first two Edge Moor units were completed; those original units have since been retired."},{"event":"Unit 3 commercial operation","date":"1954","detail":"Unit 3 began commercial operation."},{"event":"Unit 10 commercial operation","date":"1963","detail":"Unit 10, a combustion-turbine unit, began commercial operation."},{"event":"Plant-level commercial-operation reference","date":"1965","detail":"The DOJ divestiture description characterizes Edge Moor as a 707 MW simple-cycle natural-gas plant that began commercial operations in 1965; unit-level records separately list earlier and later unit dates."},{"event":"Unit 4 commercial operation","date":"1966","detail":"Unit 4 began commercial operation."},{"event":"Unit 5 commercial operation","date":"1973","detail":"Unit 5 began commercial operation."},{"event":"Pollution-control financing","date":"1979","detail":"Delmarva Power received $17.7 million from tax-exempt pollution-control bonds for pollution-control equipment at the Indian River and Edge Moor stations."},{"event":"Emissions-control investment","date":"2009","detail":"Conectiv Energy installed water-injection pollution-control equipment on Edge Moor 10 and reported approximately $62 million of pollution-control equipment and enhancements at the Edge Moor facility through December 2009."},{"event":"Calpine acquisition announced","date":"2010-04-21","detail":"Calpine announced its agreement to purchase Pepco Holdings' 4,490 MW Conectiv Energy generation fleet for $1.65 billion plus adjustments; the fleet included Edge Moor."},{"event":"Calpine acquisition closed","date":"2010-06-30","detail":"Calpine completed the acquisition of Conectiv Energy's generation business from Pepco Holdings for approximately $1.63 billion in cash plus approximately $49 million for fuel inventory at closing."},{"event":"Fuel conversion and coal discontinuation","date":"2010-07-01","detail":"Edge Moor began burning natural gas exclusively and coal generation was discontinued. This is treated as a fuel-conversion milestone rather than a separately documented equipment repowering."},{"event":"Constellation acquisition of Calpine","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the parent company of Calpine's Edge Moor business."},{"event":"Proposed sale to LS Power","date":"2026-03-18","detail":"Constellation and LS Power announced a proposed sale including Edge Moor as part of a roughly 4.4 GW PJM portfolio valued at $5 billion before closing adjustments; closing was subject to regulatory approvals and expected later in 2026."}] — Source · confidence: medium
- Timeline: [{"event":"Initial construction","date":"1951","detail":"The first two Edge Moor units were completed; those original units have since been retired."},{"event":"Unit 3 commercial operation","date":"1954","detail":"Unit 3 began commercial operation."},{"event":"Unit 10 commercial operation","date":"1963","detail":"Unit 10, a combustion-turbine unit, began commercial operation."},{"event":"Plant-level commercial-operation reference","date":"1965","detail":"The DOJ divestiture description characterizes Edge Moor as a 707 MW simple-cycle natural-gas plant that began commercial operations in 1965; unit-level records separately list earlier and later unit dates."},{"event":"Unit 4 commercial operation","date":"1966","detail":"Unit 4 began commercial operation."},{"event":"Unit 5 commercial operation","date":"1973","detail":"Unit 5 began commercial operation."},{"event":"Pollution-control financing","date":"1979","detail":"Delmarva Power received $17.7 million from tax-exempt pollution-control bonds for pollution-control equipment at the Indian River and Edge Moor stations."},{"event":"Emissions-control investment","date":"2009","detail":"Conectiv Energy installed water-injection pollution-control equipment on Edge Moor 10 and reported approximately $62 million of pollution-control equipment and enhancements at the Edge Moor facility through December 2009."},{"event":"Calpine acquisition announced","date":"2010-04-21","detail":"Calpine announced its agreement to purchase Pepco Holdings' 4,490 MW Conectiv Energy generation fleet for $1.65 billion plus adjustments; the fleet included Edge Moor."},{"event":"Calpine acquisition closed","date":"2010-06-30","detail":"Calpine completed the acquisition of Conectiv Energy's generation business from Pepco Holdings for approximately $1.63 billion in cash plus approximately $49 million for fuel inventory at closing."},{"event":"Fuel conversion and coal discontinuation","date":"2010-07-01","detail":"Edge Moor began burning natural gas exclusively and coal generation was discontinued. This is treated as a fuel-conversion milestone rather than a separately documented equipment repowering."},{"event":"Constellation acquisition of Calpine","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the parent company of Calpine's Edge Moor business."},{"event":"Proposed sale to LS Power","date":"2026-03-18","detail":"Constellation and LS Power announced a proposed sale including Edge Moor as part of a roughly 4.4 GW PJM portfolio valued at $5 billion before closing adjustments; closing was subject to regulatory approvals and expected later in 2026."}] — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Timeline.0: {"event":"Initial construction","date":"1951","detail":"The first two Edge Moor units were completed; those original units have since been retired."} — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Timeline.1: {"event":"Unit 3 commercial operation","date":"1954","detail":"Unit 3 began commercial operation."} — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Timeline.2: {"event":"Unit 10 commercial operation","date":"1963","detail":"Unit 10, a combustion-turbine unit, began commercial operation."} — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Timeline.3: {"event":"Plant-level commercial-operation reference","date":"1965","detail":"The DOJ divestiture description characterizes Edge Moor as a 707 MW simple-cycle natural-gas plant that began commercial operations in 1965; unit-level records separately list earlier and later unit dates."} — Source · confidence: medium
- Timeline.4: {"event":"Unit 4 commercial operation","date":"1966","detail":"Unit 4 began commercial operation."} — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Timeline.5: {"event":"Unit 5 commercial operation","date":"1973","detail":"Unit 5 began commercial operation."} — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Timeline.6: {"event":"Pollution-control financing","date":"1979","detail":"Delmarva Power received $17.7 million from tax-exempt pollution-control bonds for pollution-control equipment at the Indian River and Edge Moor stations."} — Source · confidence: medium
- Timeline.7: {"event":"Emissions-control investment","date":"2009","detail":"Conectiv Energy installed water-injection pollution-control equipment on Edge Moor 10 and reported approximately $62 million of pollution-control equipment and enhancements at the Edge Moor facility through December 2009."} — Source · confidence: high
- Timeline.8: {"event":"Calpine acquisition announced","date":"2010-04-21","detail":"Calpine announced its agreement to purchase Pepco Holdings' 4,490 MW Conectiv Energy generation fleet for $1.65 billion plus adjustments; the fleet included Edge Moor."} — Source · confidence: high
- Timeline.10: {"event":"Fuel conversion and coal discontinuation","date":"2010-07-01","detail":"Edge Moor began burning natural gas exclusively and coal generation was discontinued. This is treated as a fuel-conversion milestone rather than a separately documented equipment repowering."} — Edge Moor Power Plant - Global Energy Monitor · confidence: medium
- Timeline.11: {"event":"Constellation acquisition of Calpine","date":"2026-01-07","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the parent company of Calpine's Edge Moor business."} — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Commercial parties.2: {"relationship":"Predecessor generation company","name":"Conectiv Energy","detail":"Conectiv Energy operated and owned the generation assets before the 2010 transfer to Calpine as a subsidiary of Pepco Holdings.","official_url":null} — Source · confidence: medium
- Commercial parties.3: {"relationship":"2010 acquirer and historical owner","name":"Calpine Corporation","detail":"Calpine acquired the Conectiv generation fleet from Pepco Holdings in June 2010 and subsequently controlled the Edge Moor facility.","official_url":"https://www.calpine.com/"} — Source · confidence: high
- Commercial parties.5: {"relationship":"Current parent owner","name":"Constellation Energy Corporation","detail":"Constellation completed its acquisition of Calpine from Energy Capital Partners on January 7, 2026; the Edge Moor business therefore became part of Constellation's portfolio.","official_url":"https://www.constellationenergy.com/"} — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: medium
- Commercial parties.6: {"relationship":"Former parent seller of Calpine","name":"Energy Capital Partners","detail":"Energy Capital Partners was the seller of Calpine Corporation to Constellation in the January 2026 corporate transaction; its role was at the parent-company level rather than a separately documented direct Edge Moor sale.","official_url":"https://www.ecpgp.com/"} — Constellation Completes Calpine Transaction, Powering America's Clean Energy Future · confidence: high
- Commercial parties.6: {"relationship":"Former parent seller of Calpine","name":"Energy Capital Partners","detail":"Energy Capital Partners was the seller of Calpine Corporation to Constellation in the January 2026 corporate transaction; its role was at the parent-company level rather than a separately documented direct Edge Moor sale.","official_url":"https://www.ecpgp.com/"} — Home | Energy Capital Partners I ECP · confidence: high
- Quality notes.1: Unit-level records list commercial-operation years of 1954, 1963, 1966, and 1973, while the DOJ divestiture description characterizes the plant as beginning commercial operations in 1965; these should not be collapsed into one unqualified date. — Edge Moor Power Plant - Global Energy Monitor · confidence: medium

## Timeline

- 1951 — Initial construction
  The first two Edge Moor units were completed; those original units have since been retired.
  Source: Edge Moor Power Plant - Global Energy Monitor (https://www.gem.wiki/Edge_Moor_Power_Plant)
- 1954 — Unit 3 commercial operation
  Unit 3 began commercial operation.
  Source: Edge Moor Power Plant - Global Energy Monitor (https://www.gem.wiki/Edge_Moor_Power_Plant)
- 1965 — Plant-level commercial-operation reference
  The DOJ divestiture description characterizes Edge Moor as a 707 MW simple-cycle natural-gas plant that began commercial operations in 1965; unit-level records separately list earlier and later unit dates.
  Source: Source (https://public-inspection.federalregister.gov/2025-23298.pdf)
- 1966 — Unit 4 commercial operation
  Unit 4 began commercial operation.
  Source: Edge Moor Power Plant - Global Energy Monitor (https://www.gem.wiki/Edge_Moor_Power_Plant)
- 1973 — Unit 5 commercial operation
  Unit 5 began commercial operation.
  Source: Edge Moor Power Plant - Global Energy Monitor (https://www.gem.wiki/Edge_Moor_Power_Plant)
- 1979 — Pollution-control financing
  Delmarva Power received $17.7 million from tax-exempt pollution-control bonds for pollution-control equipment at the Indian River and Edge Moor stations.
  Source: Source (https://www.nrc.gov/docs/ML1808/ML18082A348.pdf)
- 2010-04-21 — Calpine acquisition announced
  Calpine announced its agreement to purchase Pepco Holdings' 4,490 MW Conectiv Energy generation fleet for $1.65 billion plus adjustments; the fleet included Edge Moor.
  Source: Source (https://www.sec.gov/Archives/edgar/data/916457/000119312510088330/dex991.htm)
- 2010-07-01 — Fuel conversion and coal discontinuation
  Edge Moor began burning natural gas exclusively and coal generation was discontinued. This is treated as a fuel-conversion milestone rather than a separately documented equipment repowering.
  Source: Edge Moor Power Plant - Global Energy Monitor (https://www.gem.wiki/Edge_Moor_Power_Plant)
- 2026-01-07 — Constellation acquisition of Calpine
  Constellation completed its acquisition of Calpine from Energy Capital Partners, making Constellation the parent company of Calpine's Edge Moor business.
  Source: Constellation Completes Calpine Transaction, Powering America's Clean Energy Future (https://www.constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html)
- 2026-03-18 — Proposed sale to LS Power
  Constellation and LS Power announced a proposed sale including Edge Moor as part of a roughly 4.4 GW PJM portfolio valued at $5 billion before closing adjustments; closing was subject to regulatory approvals and expected later in 2026.
  Source: Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction (https://www.constellationenergy.com/news/2026/03/constellation-announces-agreement-to-sell-pjm-generation-assets-to-ls-power-as-part-of-ferc-us-doj-resolution-of-calpine-transaction.html)

## Sources

- [Who We Are](https://www.calpine.com/who-we-are/) — calpine.com · tier other
- [Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction](https://www.constellationenergy.com/news/2026/03/constellation-announces-agreement-to-sell-pjm-generation-assets-to-ls-power-as-part-of-ferc-us-doj-resolution-of-calpine-transaction.html) — constellationenergy.com · tier other
- [Our Assets - Calpine](https://www.calpine.com/clean-and-reliable-power/our-assets/) — calpine.com · tier other
- [Title V Permit Renewal Applications: Edge Moor Energy Center - DNREC](https://dnrec.delaware.gov/public-notices/aq20260101/) — dnrec.delaware.gov · tier regulatory
- [calpine corporation](https://downloads.regulations.gov/EPA-HQ-OAR-2013-0809-0034/attachment_14.pdf) — downloads.regulations.gov · tier regulatory
- [Sub Regional RTEP Committee PJM Mid-Atlantic](https://www.pjm.com/-/media/DotCom/committees-groups/committees/srrtep-ma/20191118/20191118-reliability-analysis-update.pdf) — pjm.com · tier other
- [Source](https://documents.dnrec.delaware.gov/Admin/Public-Notices/WR20250094/Calpine-Mid-Atlantic-Generation.pdf) — documents.dnrec.delaware.gov · tier regulatory
- [Edge Moor Facility (Formerly: Chemours](https://www.epa.gov/system/files/documents/2021-09/port-of-wilmington-edgemoor-sb.pdf) — epa.gov · tier regulatory
- [Federal Register :: United States et al. v. Constellation Energy Corporation et al.; Proposed Final Judgment and Competitive Impact Statement](https://www.federalregister.gov/documents/2025/12/18/2025-23298/united-states-et-al-v-constellation-energy-corporation-et-al-proposed-final-judgment-and-competitive-impact-statement) — federalregister.gov · tier regulatory
- [Edge Moor Power Plant - Global Energy Monitor](https://www.gem.wiki/Edge_Moor_Power_Plant) — gem.wiki · tier other
- [Steam Turbine Power Plant Solutions](https://www.gevernova.com/gas-power/products/steam-turbines) — gevernova.com · tier other
- [Utility steam turbines](https://www.siemens-energy.com/global/en/home/products-services/product/utility-steam-turbines.html) — siemens-energy.com · tier other
- [Gas Turbines](https://power.mhi.com/products/gasturbines) — power.mhi.com · tier other
- [Source](https://public-inspection.federalregister.gov/2025-23298.pdf) — public-inspection.federalregister.gov · tier regulatory
- [Source](https://monitoringanalytics.com/filings/2026/IMM_Comments_Docket_No_EC26-102_20260721.pdf) — monitoringanalytics.com · tier other
- [Constellation Completes Calpine Transaction, Powering America's Clean Energy Future](https://www.constellationenergy.com/news/2026/01/constellation-completes-calpine-transaction-powering-americas-clean-energy-future.html) — constellationenergy.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/916457/000119312510088330/dex991.htm) — sec.gov · tier regulatory
- [Source](https://www.nrc.gov/docs/ML1808/ML18082A348.pdf) — nrc.gov · tier regulatory
- [Source](https://www.sec.gov/Archives/edgar/data/8192/000119312510041024/d10k.htm) — sec.gov · tier regulatory
- [Home | Energy Capital Partners I ECP](https://www.ecpgp.com/) — ecpgp.com · tier other
- [Table of Operating Power Plants and Projects Under Construction as of: Friday, February 6, 2026](https://www.calpine.com/wp-content/uploads/2026/02/CPN-PORT-1_Q12026.pdf) — calpine.com · tier other
- [Constellation Announces Agreement to Sell PJM Generation Assets to LS Power as Part of FERC, U.S. DOJ Resolution of Calpine Transaction - LS Power](https://www.lspower.com/news/constellation-announces-agreement-to-sell-pjm-generation-assets-to-ls-power-as-part-of-ferc-u-s-doj-resolution-of-calpine-transaction/) — lspower.com · tier other
- [Source](https://www.monitoringanalytics.com/filings/2026/IMM_Comments_Docket_No_EC26-102_20260721.pdf) — monitoringanalytics.com · tier other

## Data quality

- Published capacity figures vary by rating and source: approximately 697.8 MW, 707 MW, and 710.3 MW are reported; approximately 707 MW is used for directory prose because it appears in the DOJ divestiture description. Unit-level records list commercial-operation years of 1954, 1963, 1966, and 1973, while the DOJ divestiture description characterizes the plant as beginning commercial operations in 1965; these should not be collapsed into one unqualified date. The identified financing includes pooled pollution-control bonds and acquisition financing. No separate Edge Moor-only project-finance facility or Edge Moor-specific new-build repowering transaction is identified in the cited records.

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