How big is Middletown Energy Center?

Middletown Energy Center has a reported capacity of 543.9 MW. Source: EIA Form 860.

What kind of plant is Middletown Energy Center?

Middletown Energy Center is a Natural Gas Fired Combined Cycle facility in Butler County, OH, participating in the PJM market.

Where is Middletown Energy Center located?

Middletown Energy Center is in Butler County, OH, inside the PJM balancing area.

Who operates Middletown Energy Center?

Middletown Energy Center is operated by Ohio Power Partners, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Middletown Energy Center generate?

Middletown Energy Center reported 3,460.6 GWh over the twelve months to 2026-04. Figures are net generation as filed to EIA-923.

How does Middletown Energy Center compare to other plants?

By capacity, Middletown Energy Center ranks #294 of 538 operating plants of the same technology nationally. It ranks #11 of 14 in OH.

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Natural Gas Fired Combined CyclePJM · Butler County

Middletown Energy Center

ArcLight Capital Partners, LLC · Butler County · PJM

Middletown Energy Center is a natural gas-fired power facility with 543.9 MW of EIA-reported nameplate capacity in Butler County, Ohio, registered as EIA Plant ID 59326. ArcLight Capital Partners, LLC is the current owner; Ohio Power Partners, LLC is the registered plant entity or operator. The plant's generating configuration is natural-gas-fired 1 1 combined-cycle plant with one Mitsubishi 501GAC combustion turbine, one Toshiba steam turbine, and one Vogt heat-recovery steam generator. The facility interconnects at MIDLTWN218 KV MIDDLTST at 345 kV.

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Asset analyst

plant:plant-59326

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

Overview

Key fields

Reported capacity: 543.9 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combined Cycle
Primary generation technology.
Registry anchor: Plant 59326
Ohio Power Partners, LLC · Butler County · PJM
Operating status: Operating
Middletown Energy Center is operating.

Profile

Grid role: Reliable, dispatchable generation selling energy and capacity into PJM.

Structured profile

Reported capacity: 543.9 MW
Natural Gas Fired Combined Cycle
Operating status: operating
Middletown Energy Center is operating.
Location: Butler County
PJM
Operator: Ohio Power Partners, LLC
Asset role

Units and generators

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

Generator	Capacity	Technology	Operation	Status
MEC1	310.2 MW 253.3 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	May 2018	Operating
MEC2	233.7 MW 209.2 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CA	May 2018	Operating

Performance

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

Peer context

Technology capacity: 543.9 MW
National rank: #294
OH rank: #11

Monthly generation

Download CSV

Latest 12 months

3.46 TWh

Reported net generation

Latest report

Apr 2026

EIA-923 monthly filing

2025 capacity factor

66.0%

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

TAP137618

IN SERVICE · 138 kV

0.3 km

TAP161786

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

Oct 2, 2015

Gemma Power Systems, LLC contracted to build facility under Engineering, Procurement and Construction Services contract; NTE Energy Services Company, LLC identified as construction and asset manager. No contract value disclosed.

Gemma Power Systems, LLC · NTE Energy Services Company, LLC

NTEEnergy, LLC 24 Cathedral Place, Suite 300 St. Augustine, FL 32084 www.nteenergy.com Contact: Hannah Jacob Office: 904.687.1857 Cell: 331.442.6220 hjacob@nteenergy.com

Land and environmental record

Land-Record Research Result

Butler County Auditor property-search and GIS resources located; no matching parcel record or parcel number retrieved. The 45-acre and 46-acre figures remain reported project-site descriptions rather than verified parcel totals.

Address Search

Water Sourcing And Wastewater

Municipal water supply and municipal wastewater service planned

Project description states facility supplied water by City of Middletown; city provides wastewater-discharge services.

NTE Ohio begins approval process for 540-MW gas project

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 / operatorFinancier

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

May 2018
May 2018
Generators enter operationEIA-860
EIA-860 lists generator MEC1, generator MEC2 with this operating date.
Jun 2018
Jun 2018
Commercial Operation

Middletown Energy Center

Ask about Middletown Energy Center

Middletown Energy Center

Ask about Middletown Energy Center

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 Middletown Energy Center

How big is Middletown Energy Center?

What kind of plant is Middletown Energy Center?

Where is Middletown Energy Center located?

Who operates Middletown Energy Center?

How much electricity does Middletown Energy Center generate?

How does Middletown Energy Center compare to other plants?

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