Millennium Power — 428 MW gas plant, Worcester County, MA

Millennium Power — 428 MW gas plant, Worcester County, MA · Ask the Grid

Generation and physical site

EIA plant 55079 · Inventory for Aug 2026.

Reported operating nameplate by technology

Natural gas: 427.5 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 Millennium Power
Generator	Technology	Status	Power (MW)	Energy (MWh)
CT01	Natural Gas Fired Combined Cycle	Operating	295.2	Unknown
ST01	Natural Gas Fired Combined Cycle	Operating	132.3	Unknown

Physical map location · OpenStreetMap: 42.11251, -72.01535
Filed location · EIA: 42.11229, -72.01511

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Aug 2026
EIA retrieved: Oct 10, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Mar 7, 2023
Map prepared: Oct 10, 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

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

Generator	Capacity	Technology	Operation	Status
CT01	295.2 MW 222.1 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Apr 2001	Operating
ST01	132.3 MW 108 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CA	Apr 2001	Operating

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

Apr 2001
Apr 2001
Generators enter operationEIA-860
EIA-860 lists generator CT01, generator ST01 with this operating date.
Dec 26, 2001
Dec 26, 2001
Multi-project construction financing closedinvestor.pg...
PG&E National Energy Group closed the first tranche of a $1.075 billion loan facility covering the Athens, Harquahala, and Millennium projects. Millennium had already entered commercial operation in April 2001; proceeds could reimburse prior expenditures and finance completion of the covered projects. Joint lead arrangers were Société Générale and Salomon Smith Barney/Citibank, with additional arrangers and lenders including JPMorgan Chase, ABN-AMRO, Royal Bank of Scotland, Export Development Corporation of Canada, Crédit Lyonnais, Barclays Bank, and DZ Bank.
Jun 25, 2003
Jun 25, 2003
FERC filing for transfer flexibilitygovinfo.gov
PG&E National Energy Group's indirect subsidiary Millennium Power Partners, L.P. and MACH Gen, LLC filed with FERC regarding additional flexibility in implementing a previously authorized transfer of jurisdictional facilities. The record describes this as a framework for proposed transfer rather than documenting a completed plant-specific sale.
Nov 2, 2015
Nov 2, 2015
Talen Energy acquires MACH Gen (including Millennium)prnewswire....
Talen Energy Supply, LLC completed its approximately $1.175 billion acquisition of 100% of MACH Gen, LLC. MACH Gen's structure included Millennium Power Partners, L.P., which owned and operated the Millennium Project; this was an indirect acquisition of Millennium as part of a three-plant portfolio deal covering plants in New York, Massachusetts, and Arizona.
Mar 11, 2026
Mar 11, 2026
Ara Energy announces Gate City Power portfolio acquisitionarapartners...
Ara Partners announced that Ara Energy would acquire Gate City Power and related businesses from HF Capital for approximately $875 million. Gate City Power is described as a portfolio of thermal generation assets across NYISO and ISO-NE totaling approximately 2.2 GW. The announcement does not disclose a Millennium Power-specific purchase price. The closing was expected in early 2026, subject to regulatory approvals and customary conditions.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

documents.dps.ny.govdocuments.dps.ny.govauthoritative

Common questions about Millennium Power

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Millennium Power?

Millennium Power reports 427.5 MW natural gas of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.

What kind of plant is Millennium Power?

Millennium Power is a Natural Gas Fired Combined Cycle facility in Worcester County, MA, participating in the ISO-NE market.

Where is Millennium Power located?

Millennium Power is in Worcester County, MA, inside the ISO-NE balancing area.

Who operates Millennium Power?

Millennium Power is operated by Millennium Power Company, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Millennium Power generate?

Millennium Power reported 880.5 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

How does Millennium Power compare to other plants?

By capacity, Millennium Power ranks #325 of 540 operating plants of the same technology nationally. It ranks #5 of 15 in MA.

Co-located assets

Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.

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Overview

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Overview

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Generation and physical site

Reported operating nameplate by technology

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