How big is Garrison Energy Center LLC?

Garrison Energy Center LLC has a reported capacity of 361 MW. Source: EIA Form 860.

What kind of plant is Garrison Energy Center LLC?

Garrison Energy Center LLC is a Natural Gas Fired Combined Cycle facility in Kent County, DE, participating in the PJM market.

Where is Garrison Energy Center LLC located?

Garrison Energy Center LLC is in Kent County, DE, inside the PJM balancing area.

Who operates Garrison Energy Center LLC?

Garrison Energy Center LLC is operated by Garrison Energy Center LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Garrison Energy Center LLC generate?

Garrison Energy Center LLC reported 944.1 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

How does Garrison Energy Center LLC compare to other plants?

By capacity, Garrison Energy Center LLC ranks #336 of 538 operating plants of the same technology nationally. It ranks #2 of 3 in DE.

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Natural Gas Fired Combined CyclePJM · Kent County

Garrison Energy Center LLC

Vistra Corp · Kent County · PJM

Garrison Energy Center LLC is a natural gas-fired power facility with 361 MW of EIA-reported nameplate capacity in Kent County, Delaware, registered as EIA Plant ID 57349. Cobalt Power, L. L. C. is the current owner; Garrison Energy Center LLC is the registered plant entity or operator. At 361 MW of EIA nameplate capacity, Garrison Energy Center is ranked third among Delaware power plants by capacity in the cited EIA-based directory.

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Asset analyst

plant:plant-57349

Ask about Garrison Energy Center LLC

Investigate technology, capacity, output, price behavior, ownership, and related facilities using this profile plus current grid data.

Overview

Key fields

Reported capacity: 361 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combined Cycle
Primary generation technology.
Registry anchor: Plant 57349
Garrison Energy Center LLC · Kent County · PJM
Operating status: Operating
Garrison Energy Center LLC is operating.

Profile

Grid role: Combined-cycle generation serving the PJM wholesale regional grid
Context: At 361 MW of EIA nameplate capacity, Garrison Energy Center is ranked third among Delaware power plants by capacity in the cited EIA-based directory. It is a PJM facility located in the EMAAC zone and was included in Vistra’s 2025 acquisition of seven gas-generation assets.
Physical build: The built asset is a 309-MW greenfield combined-cycle gas-fired plant in Dover, Delaware, delivered through lump-sum EPC by Matrix NAC with Parsons Brinckerhoff. The installed scope includes one General Electric 7FA combustion turbine, one heat-recovery steam generator, one steam turbine, one 86,000-gal/min cooling-water tower, one 1.4-million-gallon ULSD storage tank, a 230-kV transmission line, and two 230-kV substations, with advanced environmental controls. The EIA plant record separately reports two operating generator records totaling 361 MW nameplate capacity.

Structured profile

Reported capacity: 361 MW
Natural Gas Fired Combined Cycle
Operating status: operating
Garrison Energy Center LLC is operating.
Location: Kent County
PJM
Operator: Garrison Energy Center LLC
Asset role

Units and generators

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

Generator	Capacity	Technology	Operation	Status
CTG1	235 MW 186 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Jun 2015	Operating
STG2	126 MW 123 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CA	Jun 2015	Operating

Performance

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

Peer context

Technology capacity: 361 MW
National rank: #336
DE rank: #2

Monthly generation

Download CSV

Latest 12 months

944.1 GWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

27.1%

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

UNKNOWN170928

IN SERVICE · 230 kV

0.1 km

UNKNOWN157015

Commercial, land, and environmental record

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

Transactions and agreements

EPC Contract Award

Dec 31, 2012

Kvaerner NAC and Parsons Brinckerhoff joint venture received EPC contract from Calpine Garrison LLC effective December 31, 2012 to engineer, procure, and construct 309 MW facility. Contract value approximately $100–$120 million.

309 MW contractedCalpine Garrison LLC · Kvaerner North American Construction Inc. · Parsons Brinckerhoff Inc.

Kvaerner awarded contract for Gas-Fired Power Plant in Delaware

Land and environmental record

Air Permit Identifiers

Nov 5, 2025

APC-2012/0098-OPERATION (Amendment 3) NSPS/LAER/PSD/FE; APC-2012/0038-OPERATION (Amendment 3) FE; APC-2012/0039-OPERATION (Amendment 3) VOC RACT/FE

DNREC November 2025 notice identifies underlying air permits to be amended to incorporate new Title V requirements.

Title V Permit Renewal Applications: Garrison Energy Center, LLC - DNREC

Emissions Limits

Nov 5, 2025

106.2 TPY NOx, 97.4 TPY CO, 24.3 TPY SO2, 120.4 TPY PM10/PM2.5, 19.3 TPY VOC, 19.4 TPY H2SO4, 2.5 TPY formaldehyde HAPs, 80.0 TPY NH3, 1,006,399 TPY CO2e

Proposed Title V renewal permit limits combustion turbine annual emissions per DNREC November 2025 notice.

Title V Permit Renewal Applications: Garrison Energy Center, LLC - DNREC

Proposed Land Sale

Sep 25, 2023

September 2023 city staff recommendation for buyout of Garrison Energy Center LLC Lot 7 lease as part of proposed sale of Lots 5, 6, and 7

City council agenda September 25, 2023 proposed buyout of Lot 7 lease and sale process for Lots 5, 6, and 7. Records show proposal, not definitive transaction completion.

Source

Site Area

Jun 5, 2014

37 acres

Delaware state reporting states that Garrison Energy Center will occupy 37 acres within Garrison Oak Technical Park.

Source

Wastewater

Jun 7, 2015

Plant could produce up to approximately 200,000 gallons of wastewater per day

2015 local report stated potential wastewater production. Retrieved DNREC materials document air permit and cooling-water source but do not identify wastewater discharge permit number.

Garrison Energy Center fired up in Dover

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

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AssetOwner / operatorContractorFinancierOrganization

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Jan 9, 2015
Jan 9, 2015
FERC market-based-rate and financing authorization proceedingFederal Reg...
The Federal Register published FERC’s supplemental notice for Garrison’s market-based-rate filing, which included a request for blanket Section 204 authorization for future securities issuances and assumptions of liability.

Garrison Energy Center LLC

Ask about Garrison Energy Center LLC

Garrison Energy Center LLC

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Overview

Key fields

Profile

Structured profile

Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Transactions and agreements

Land and environmental record

Related parties and identifiers

Relationship graph

Timeline and sources

Project timeline

Parties and identifiers

Reporting portfolio

Sources

Common questions about Garrison Energy Center LLC

How big is Garrison Energy Center LLC?

What kind of plant is Garrison Energy Center LLC?

Where is Garrison Energy Center LLC located?

Who operates Garrison Energy Center LLC?

How much electricity does Garrison Energy Center LLC generate?

How does Garrison Energy Center LLC compare to other plants?

Co-located assets

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