10th largest plant in Massachusetts · 817th nationally
Millennium Power is a natural gas power plant in Massachusetts with a nameplate capacity of 428 MW. It generates roughly 625.5k MWh per year — enough to power about 59,567 average U.S. homes.
Its capacity factor of 17% reflects intermittent or peaking operation. At 857 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
Ghost bars are each month's theoretical maximum (428 MW nameplate × hours in the month). Filled bars are actual net generation reported to EIA Form 923. The gap between them is capacity factor made visible.
| Plant Name | Millennium Power |
|---|---|
| Operator | Millennium Power Company, Llc |
| City | Charlton |
| County | Worcester County |
| State | Massachusetts |
| ZIP | 01507 |
| Coordinates | 42.11229, -72.01511 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| CT01 | Natural Gas Fired Combined Cycle | Natural Gas | 295 MW | Operating | 2001 |
| ST01 | Natural Gas Fired Combined Cycle | Natural Gas | 132 MW | Operating | 2001 |
| CO₂ | 268.1k metric tons |
|---|---|
| SO₂ | 1 metric tons |
| NOₓ | 38 metric tons |
| CO₂ Rate | 857 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | NPCC |
|---|---|
| Balancing Authority | Iso New England Inc. |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.