How big is Edge Moor?

Edge Moor has a reported capacity of 697.8 MW. Source: EIA Form 860.

What kind of plant is Edge Moor?

Edge Moor is a Natural Gas Steam Turbine facility in New Castle County, DE, participating in the PJM market.

Where is Edge Moor located?

Edge Moor is in New Castle County, DE, inside the PJM balancing area.

Who operates Edge Moor?

Edge Moor is operated by Calpine Mid-Atlantic Generation LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Edge Moor generate?

Edge Moor reported 327.6 GWh over the twelve months to 2024-12. Figures are net generation as filed to EIA-923.

Where does Edge Moor connect to the grid?

Edge Moor interconnects at Edge Moor substation, on the Delmarva Power & Light Company (DPL), an Exelon transmission-zone utility system.

How does Edge Moor compare to other plants?

By capacity, Edge Moor ranks #43 of 257 operating plants of the same technology nationally. It ranks #1 of 1 in DE.

Edge Moor — 698 MW gas plant, New Castle County, DE

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Edge Moor — 698 MW gas plant, New Castle County, DE · Ask the Grid

Overview

Reported capacity: 697.8 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Steam Turbine
Primary generation technology.
Registry anchor: Plant 593
New Castle County · PJM
Operating status: Operating
Edge Moor is operating.
Grid connection: Edge Moor substation
230 kV · Delmarva Power & Light Company (DPL), an Exelon transmission-zone utility

Infrastructure record

Operator: Calpine Mid-Atlantic Generation LLC

Profile

Grid role: Dispatchable peaking generation; historical Calpine asset information characterizes the Edge Moor facility as natural-gas/oil-fired simple-cycle generation with peaking capacity.
Grid connection: Edge Moor substation · 230 kV · Delmarva Power & Light Company (DPL), an Exelon transmission-zone utility.
Context: 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.
Physical build: 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.

Structured profile

Reported capacity: 697.8 MW
Natural Gas Steam Turbine
Operating status: operating
Edge Moor is operating.
Interconnection: Edge Moor substation
230 kV · Delmarva Power & Light Company (DPL), an Exelon transmission-zone utility
Location: New Castle County
PJM
Asset role: natural gas

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Units and generators

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

Generator	Capacity	Technology	Operation	Status
10	12.5 MW 12 MW summer	Petroleum Liquids Disillate Fuel Oil · GT	Jun 1963	Standby/Backup: available for service but not normally used
3	75 MW 86 MW summer	Natural Gas Steam Turbine Natural Gas · ST	Dec 1954	Operating
4	176.8 MW 171 MW summer	Natural Gas Steam Turbine Natural Gas · ST	Apr 1966	Operating
5	446 MW 438 MW summer	Natural Gas Steam Turbine Natural Gas · ST	Aug 1973	Operating

Performance

Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.

Peer context

Technology capacity: 697.8 MW; Natural Gas Steam Turbine
National rank: #43; of 257 operating peers
DE rank: #1; of 1 operating peers

Monthly generation

Download CSV

Latest 12 months

327.6 GWh

Reported net generation

Latest report

Dec 2024

EIA-923 monthly filing

2024 capacity factor

5.3%

Using current reported nameplate capacity

Grid and market context

Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.

Nearby substations

HIFLD infrastructure inventory

UNKNOWN129074

IN SERVICE · 230 kV

0.1 km

UNKNOWN130225

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Air Permit

Mar 25, 2026

Permit No. Title V operating permit AQM-003/00007-Renewal (04)

DNREC published a March 25, 2026 draft/proposed renewal for First State Generation LLC's Edge Moor Energy Center. The latest located evidence describes the action as draft/proposed; final issuance status unknown as of August 2, 2026.

Title V Permit Renewal Applications: Edge Moor Energy Center - DNREC

Emissions Limits

Mar 25, 2026

Underlying air permits APC-83/0824, APC-83/0825, APC-83/0826, and APC-2015/0026 with NOx limits of 265, 483, 1,348, and 9.47 TPY respectively

The Title V draft notice states that underlying Delaware operating permits would be amended with specified criteria-pollutant limits including SO2, particulate, VOC, and CO limits.

Title V Permit Renewal Applications: Edge Moor Energy Center - DNREC

Hazardous Waste And Storage

Site classified as a hazardous-waste generator; aboveground-storage-tank data listed in Delaware Environmental Navigator.

Delaware Environmental Navigator maintains separate facility entries for Calpine Edge Moor under Hazardous Waste Generator and Aboveground Storage Tanks programs. Specific waste streams and tank details not disclosed in available records.

Facility Detail - Delaware Environmental Navigator

Wastewater Permit

2021

NPDES Permit DE0000558; DRBC Docket D-1981-020 CP-3

The DRBC renewal docket identifies NPDES Permit DE0000558 for non-contact cooling water and process-water discharge via Outfalls 001, 006, and 007 to Delaware River Water Quality Zone 5. No facility modifications were proposed in the renewal.

Source

Water Allocation

27,168.4 million gallons per month total DRBC allocation (8,763.7 mgm from Pumphouse 2; 18,404.7 mgm from Pumphouse 3)

DRBC Docket D-2000-012 CP-2 describes combined allocation for Edge Moor and Hay Road facilities; the 24-hour allocation equivalent is 1.065 billion gallons per day.

Source

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Relationship graph

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

AssetOwner / operator

Parties and identifiers

OrganizationRoleBasis

plant:plant-593Grid selectionCanonical asset page /assets/facilities/edge-moor.

Reporting portfolio

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

1951
1951
Initial ConstructionEdge Moor P...
The first two Edge Moor units were completed; those original units have since been retired.
1954
1954
Unit 3 commercial operation

EIA reporting entity

Calpine Mid-Atlantic Generation LLC

Entity 56609

Operating portfolio

2 plants

1 states

Reported capacity

1,796 MW

Natural Gas Fired Combined Cycle · Natural Gas Steam Turbine

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Hay Road	1,098.2 MW	DE
Edge MoorCurrent	697.8 MW	DE

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

View full reporting portfolio

Edge Moor