Deer Island Treatment Plant
Biomass power plant in Suffolk County, Massachusetts. 20.8 MW of nameplate capacity across 6 generators, operated by Massachusetts Wtr Rauth-Deer I.
Also known as MWRA Deer Island · EIA plant 10823
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 20.8 MWBiomass 17.5 · Hydro 2.0 · Wind 1.2 · Solar 0.1
- Generators
- 6 operatingEIA-860M, August 2026
- Operating since
- July 1998First generator online
- Operator
- Massachusetts Wtr Rauth-Deer IEIA operator ID 11427
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- None linkedNo verified ISO node
- Location
- Suffolk County, MA42.3533, −70.9628
- EIA plant ID
- 10823EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Deer Island Treatment Plant produces
Free · EIA-923Net generation, 2025
33.4 GWh
33,356 MWh, final
Capacity factor, 2025
5.2%
2024: 5.8%
January to July 2026
19.3 GWh
Provisional
Range, 2015 to 2025
28.4–44.2
GWh a year. Low 2015, high 2018
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 33,259 | Not reported | 12 of 12 |
| 2001 | 2,072 | Not reported | 1 of 12 |
| 2002 | 33,476 | Not reported | 12 of 12 |
| 2003 | 11,043 | Not reported | 4 of 12 |
| 2004 | 34,514 | Not reported | 12 of 12 |
| 2005 | 45,090 | Not reported | 12 of 12 |
| 2006 | 41,692 | Not reported | 12 of 12 |
| 2007 | 36,779 | Not reported | 12 of 12 |
| 2008 | 35,625 | Not reported | 12 of 12 |
| 2009 | 35,866 | Not reported | 12 of 12 |
| 2010 | 37,008 | 5.8% | 12 of 12 |
| 2011 | 26,663 | 4.2% | 12 of 12 |
| 2012 | 24,174 | 3.8% | 12 of 12 |
| 2013 | 24,107 | 3.8% | 12 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | 28,403 | 4.5% | 12 of 12 |
| 2016 | 39,774 | 6.2% | 12 of 12 |
| 2017 | 43,341 | 6.8% | 12 of 12 |
| 2018 | 44,153 | 6.9% | 12 of 12 |
| 2019 | 43,367 | 6.8% | 12 of 12 |
| 2020 | 36,470 | 5.7% | 12 of 12 |
| 2021 | 37,345 | 5.9% | 12 of 12 |
| 2022 | 35,509 | 5.6% | 12 of 12 |
| 2023 | 35,421 | 5.6% | 12 of 12 |
| 2024 | 37,002 | 5.8% | 12 of 12 |
| 2025 | 33,356 | 5.2% | 12 of 12 |
| 2026 (provisional, partial year) | 19,258 | 5.2% | 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 accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDCO₂, 2025
837
US short tons. 2024: 2,904
SO₂, 2025
Not reported
US short tons
NOx, 2025
1
US short tons
CO₂ per MWh, calculated
0.03 t
About 50 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (S42, S43), matched to EIA plant 10823 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, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| H101 | Conventional Hydroelectric | 1.0 | July 2001 |
| H201 | Conventional Hydroelectric | 1.0 | July 2001 |
| PV101 | Solar Photovoltaic | 0.1 | May 2008 |
| S101 | Other Waste Biomass | 17.5 | July 1998 |
| WT101 | Onshore Wind Turbine | 0.6 | November 2009 |
| WT102 | Onshore Wind Turbine | 0.6 | November 2009 |
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 Massachusetts Wtr Rauth-Deer I 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.
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Questions about Deer Island Treatment Plant
How much power does Deer Island Treatment Plant produce?
Deer Island Treatment Plant reported 33,356 MWh (33.4 GWh) of net generation in 2025, a 5.2% capacity factor on 20.8 MW of nameplate capacity. From January to July 2026 it reported 19.3 GWh, which is provisional.
Where is Deer Island Treatment Plant?
Deer Island Treatment Plant is in Suffolk County, Massachusetts, at 42.3533, −70.9628. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Deer Island Treatment Plant?
EIA-860M for August 2026 lists Massachusetts Wtr Rauth-Deer I as the operator (EIA operator ID 11427). The operator is not always the owner.
When did Deer Island Treatment Plant start operating?
Its first generator began operating in July 1998, according to EIA-860M.
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
- Project names from the USGS U.S. Wind Turbine Database
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page