How big is Garrison Energy Center?

Garrison Energy Center reports 361 MW natural gas of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.

What kind of plant is Garrison Energy Center?

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

Where is Garrison Energy Center located?

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

Who operates Garrison Energy Center?

Garrison Energy Center 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 generate?

Garrison Energy Center reported 968.9 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

How does Garrison Energy Center compare to other plants?

By capacity, Garrison Energy Center ranks #339 of 540 operating plants of the same technology nationally. It ranks #2 of 3 in DE.

Garrison Energy Center — 361 MW gas plant, Kent County, DE

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Garrison Energy Center — 361 MW gas plant, Kent County, DE · Ask the Grid

Generation and physical site

EIA plant 57349 · Inventory for Sep 2026.

Reported operating nameplate by technology

Natural gas: 361 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (2)

EIA generator status and nameplate capacity for Garrison Energy Center LLC
Generator	Technology	Status	Power (MW)	Energy (MWh)
CTG1	Natural Gas Fired Combined Cycle	Operating	235	Unknown
STG2	Natural Gas Fired Combined Cycle	Operating	126	Unknown

Physical map location · OpenStreetMap: 39.18723, -75.50015
Filed location · EIA: 39.18720, -75.49940

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Sep 2026
EIA retrieved: Oct 24, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Jan 29, 2024
Map prepared: Oct 24, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

Current 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 CT	Jun 2015	Operating
STG2	126 MW 123 MW summer	Natural Gas Fired Combined Cycle CA	Jun 2015	Operating

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

Mapped facility footprint

Overview

Overview

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Infrastructure record

Profile

Structured profile

Generation and physical site

Reported operating nameplate by technology

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Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Market registration

Nearby substations

Commercial, land, and environmental record

Transactions and agreements

Land and environmental record

Related parties and identifiers

Relationship graph

Parties and identifiers

Reporting portfolio

Timeline and sources

Project timeline

Sources

Common questions about Garrison Energy Center