26th largest plant in Massachusetts · 3131st nationally
Deer Island Treatment Plant is a biomass power plant in Massachusetts with a nameplate capacity of 72.8 MW. It generates roughly 35.4k MWh per year — enough to power about 3,373 average U.S. homes.
Its capacity factor of 6% reflects intermittent or peaking operation.
Ghost bars are each month's theoretical maximum (72.8 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 | Deer Island Treatment Plant |
|---|---|
| Operator | Massachusetts Wtr Rauth-Deer I |
| City | Winthrop |
| County | Suffolk County |
| State | Massachusetts |
| ZIP | 02152 |
| Coordinates | 42.35333, -70.96278 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| G101 | Petroleum Liquids | Distillate Oil | 26.0 MW | Standby | 1995 |
| G201 | Petroleum Liquids | Distillate Oil | 26.0 MW | Standby | 1995 |
| S101 | Other Waste Biomass | Other Biomass Gas | 17.5 MW | Operating | 1998 |
| 6ENT | Other Waste Biomass | Other Biomass Gas | 6.0 MW | Retired | 1989 |
| 7ENT | Other Waste Biomass | Other Biomass Gas | 6.0 MW | Retired | 1989 |
| H101 | Conventional Hydroelectric | Water | 1.0 MW | Operating | 2001 |
| H201 | Conventional Hydroelectric | Water | 1.0 MW | Operating | 2001 |
| WT101 | Onshore Wind Turbine | Wind | 0.6 MW | Operating | 2009 |
| WT102 | Onshore Wind Turbine | Wind | 0.6 MW | Operating | 2009 |
| F101 | Other Waste Biomass | Other Biomass Gas | 0.2 MW | Retired | 1997 |
| PV101 | Solar Photovoltaic | Solar | 0.1 MW | Operating | 2008 |
| NOₓ | 2 metric tons |
|---|
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. |
Biomass plants burn wood, agricultural waste, or methane from landfills to generate steam and electricity. They are considered carbon-neutral over long timescales when fuel is sustainably sourced, but they produce particulate emissions similar to coal.