Millennium Power
Natural gas power plant in Worcester County, Massachusetts. 427.5 MW of nameplate capacity across 2 generators, operated by Millennium Power Company, LLC.
Also known as Millenium Power Plant · EIA plant 55079
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 427.5 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- April 2001First generator online
- Operator
- Millennium Power Company, LLCEIA operator ID 12713
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Worcester County, MA42.1123, −72.0151
- EIA plant ID
- 55079EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Millennium Power produces
Free · EIA-923Net generation, 2025
852 GWh
852,182 MWh, final
Capacity factor, 2025
22.8%
2024: Not reported
January to July 2026
373 GWh
Provisional
Range, 2015 to 2025
0.5–2.1
TWh a year. Low 2024, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 32,474 | Not reported | 12 of 12 |
| 2001 | 1,063,088 | Not reported | 12 of 12 |
| 2002 | 2,471,188 | Not reported | 12 of 12 |
| 2003 | 1,457,419 | Not reported | 12 of 12 |
| 2004 | 0 | Not reported | 1 of 12 |
| 2005 | 1,459,527 | Not reported | 12 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | 1,937,799 | Not reported | 12 of 12 |
| 2008 | 1,937,698 | Not reported | 12 of 12 |
| 2009 | 2,003,174 | Not reported | 12 of 12 |
| 2010 | 2,033,339 | 64.5% | 12 of 12 |
| 2011 | 2,407,211 | 76.3% | 12 of 12 |
| 2012 | 2,002,904 | 63.3% | 12 of 12 |
| 2013 | 1,484,480 | Not reported | 12 of 12 |
| 2014 | 1,827,953 | 58.0% | 12 of 12 |
| 2015 | 2,101,441 | 66.6% | 12 of 12 |
| 2016 | 1,783,236 | 56.4% | 12 of 12 |
| 2017 | 1,320,001 | 41.9% | 12 of 12 |
| 2018 | 1,118,788 | Not reported | 12 of 12 |
| 2019 | 902,825 | 24.1% | 12 of 12 |
| 2020 | 1,046,674 | 27.9% | 12 of 12 |
| 2021 | 691,786 | 18.5% | 12 of 12 |
| 2022 | 1,152,563 | 30.8% | 12 of 12 |
| 2023 | 625,455 | 16.7% | 12 of 12 |
| 2024 | 520,587 | Not reported | 12 of 12 |
| 2025 | 852,182 | 22.8% | 12 of 12 |
| 2026 (provisional, partial year) | 372,552 | 17.1% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · ISONEEmissions
Free · EPA CAMPDCO₂, 2025
367,404
US short tons. 2024: 229,123
SO₂, 2025
2
US short tons
NOx, 2025
46
US short tons
CO₂ per MWh, calculated
0.43 t
About 862 lb per MWh
1 of 1 EPA units reported CO₂ in 2025 (1), matched to EIA plant 55079 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSWithdrawal, 2024
173
million gallons
Consumption, 2024
111
million gallons
Source
Southbridge WWTF
Discharge, Reclaimed. Induced-draft tower
Watershed stress
Very low/none · 0.169
USGS SUI, HUC12 Cady Brook-Quinebaug River
12 of 12 cooling months report withdrawal. Reclaimed water or plant effluent; not tested. Blank volumes are unreported, not zero.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CT01 | Natural Gas Fired Combined Cycle | 295.2 | April 2001 |
| ST01 | Natural Gas Fired Combined Cycle | 132.3 | April 2001 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Millennium Power Company, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
300 analyst questions a month, plus MCP
Query Millennium Power and 14,224 other projects from Claude or your own tools. Free accounts get 1 question a day.
Power plants near Millennium Power
Questions about Millennium Power
How much power does Millennium Power produce?
Millennium Power reported 852,182 MWh (852 GWh) of net generation in 2025, a 22.8% capacity factor on 427.5 MW of nameplate capacity. From January to July 2026 it reported 373 GWh, which is provisional.
Where is Millennium Power?
Millennium Power is in Worcester County, Massachusetts, at 42.1123, −72.0151. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Millennium Power?
EIA-860M for August 2026 lists Millennium Power Company, LLC as the operator (EIA operator ID 12713). The operator is not always the owner.
When did Millennium Power start operating?
Its first generator began operating in April 2001, according to EIA-860M.
Does InfraMap have power prices for Millennium Power?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Millennium Power, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- EIA-923 cooling water 2024 and the USGS surface water supply and use index, Water years 2010-2020 (Oct 2009 to Sep 2020), mean of monthly values
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page