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Municipal solid wasteOperatingISO-NE

SEMASS Resource Recovery

Municipal solid waste power plant in Plymouth County, Massachusetts. 98.5 MW of nameplate capacity across 2 generators, operated by SEMASS Partnership.

Also known as Reworld SEMASS · Southeastern Massachusetts Resource Recovery Facility · EIA plant 50290

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Old Middleboro Road SolarSyncarpha FreetownCranberry Highway Solar LLCWareham Solar PVSEMASS Resource Recovery2 km
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6 plants within 4.0 km, from EIA coordinates.

Key facts

Capacity
98.5 MWNameplate
Generators
2 operatingEIA-860M, August 2026
Operating since
July 1988First generator online
Operator
SEMASS PartnershipEIA operator ID 16929
Grid
ISO-NEBalancing authority ISNE
Price nodes
2 ISONE nodesResource nodes with prices
Location
Plymouth County, MA41.8022, −70.7875
EIA plant ID
50290EIA plant page

Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.

How much power SEMASS Resource Recovery produces

Free · EIA-923

Net generation, 2025

567 GWh

567,119 MWh, final

Capacity factor, 2025

65.7%

2024: 65.7%

January to July 2026

295 GWh

Provisional

Range, 2015 to 2025

550.4–594.1

GWh a year. Low 2020, high 2023

Annual net generation, GWhCapacity factor below each year
Annual net generation from EIA-923
YearNet generation, MWhCapacity factorMonths reported
2000631,886Not reported12 of 12
2001611,686Not reported12 of 12
2002594,288Not reported12 of 12
2003590,602Not reported12 of 12
2004590,030Not reported12 of 12
2005575,990Not reported12 of 12
2006594,734Not reported12 of 12
2007554,581Not reported12 of 12
2008590,437Not reported12 of 12
2009553,578Not reported12 of 12
2010584,40967.7%12 of 12
2011589,48668.3%12 of 12
2012600,66569.4%12 of 12
2013588,80468.2%12 of 12
2014603,91370.0%12 of 12
2015587,58368.1%12 of 12
2016588,47068.0%12 of 12
2017584,32867.7%12 of 12
2018568,24965.9%12 of 12
2019583,73467.7%12 of 12
2020550,43363.6%12 of 12
2021593,07368.7%12 of 12
2022590,27168.4%12 of 12
2023594,08068.9%12 of 12
2024568,14365.7%12 of 12
2025567,11965.7%12 of 12
2026 (provisional, partial year)294,89458.8%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 · ISONE

Emissions

Free · EPA CAMPD

No EPA emissions units are linked to this plant.

Water use

Free · EIA-923 cooling, USGS

No EIA cooling-water record for this plant in 2024.

Generators

Free · EIA-860M
GeneratorTechnologyNameplate MWOnline since
GEN1Municipal Solid Waste64.5July 1988
GEN2Municipal Solid Waste34.0April 1993

Ownership and offtake

Pro
Pro

Ownership and offtake are part of Pro

Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists SEMASS Partnership as the operator, which is not always the owner.

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Modeled data

Pro

Pro adds modeled values for this plant. Everything above stays free.

Modeled

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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Power plants near SEMASS Resource Recovery

Old Middleboro Road SolarSolar · 9.5 MW · 2.9 kmAcushnet AD MakepeaceSolar · 3.5 MW · 3.7 kmSyncarpha FreetownSolar · 3.9 MW · 3.7 km71 Charlotte Furnace Rd Hybrid(CSG)Solar · 2 MW · 3.8 kmCranberry Highway Solar LLCSolar · 4.2 MW · 3.9 kmWareham Solar PVSolar · 3.3 MW · 4.0 km
All 682 plants in Massachusetts69 plants in Plymouth CountyLargest power plants in MassachusettsISO-NE on the map

Questions about SEMASS Resource Recovery

How much power does SEMASS Resource Recovery produce?

SEMASS Resource Recovery reported 567,119 MWh (567 GWh) of net generation in 2025, a 65.7% capacity factor on 98.5 MW of nameplate capacity. From January to July 2026 it reported 295 GWh, which is provisional.

Where is SEMASS Resource Recovery?

SEMASS Resource Recovery is in Plymouth County, Massachusetts, at 41.8022, −70.7875. It is in the ISO New England Inc. balancing area (ISNE).

Who operates SEMASS Resource Recovery?

EIA-860M for August 2026 lists SEMASS Partnership as the operator (EIA operator ID 16929). The operator is not always the owner.

When did SEMASS Resource Recovery start operating?

Its first generator began operating in July 1988, according to EIA-860M.

Does InfraMap have power prices for SEMASS Resource Recovery?

Yes. InfraMap has ISONE day-ahead and real-time prices at 2 price nodes linked to SEMASS Resource Recovery, 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)
  • ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
  • Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)

Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page