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98.5 MW Muni. Waste operating in Plymouth, MA — ISO New England Inc.
98.5 MW
Nameplate Capacity
2
Generators
units
Municipal Solid Waste
Technology
1988
Operating Since
Coordinates
41.8022, -70.7875
County
Plymouth, MA
Nearby Plants
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | SEMASS Partnership | Covanta SEMASS | — |
| Owner(s) | SEMASS Partnership | EQT | — |
| Status | Operating | operating | — |
The Southeastern Massachusetts Resource Recovery Facility is a waste-to-energy and recycling facility located in Rochester, Massachusetts. It is currently owned by Reworld.
Read more on WikipediaSEMASS Resource Recovery is a 98.5 MW waste-to-energy plant located in Plymouth County, Massachusetts. The facility, which began operating in 1988, is owned by EQT, a company based in Sweden, and operated by SEMASS Partnership. It utilizes municipal solid waste (MSW) as its primary fuel source across its two generators. The plant is connected to the ISO New England Inc. balancing authority and falls within the North American Electric Reliability Corporation (NERC) NPCC region.
SEMASS Resource Recovery is a significant player in Massachusetts' energy landscape, ranking as the largest of five waste-to-energy plants in the state and third-largest nationally among 56 similar facilities. In the most recent year with available data, the plant generated 567,119 MWh of electricity, achieving a capacity factor of 65.8%.
Generated from EIA, GEM, and public data sources
ISO/RTO
ISO-NE
Market
ISO/RTO Member
NERC Region
NPCC — Northeast Power Coordinating Council
Balancing Authority
ISO New England Inc. (ISNE)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Commercial
Sector
Commercial Non-CHP
49.8K MWh
Latest Month
567.1K MWh
Annual Generation
65.8%
Capacity Factor
CO₂ Intensity
2004 lb/MWh
NOx
6 lb/MWh
SO₂
3 lb/MWh
CH₄
1 lb/MWh
N₂O
0.166 lb/MWh
Capacity Factor
68.8%
Annual Net Gen
594 GWh
CO₂eq
2083 lb/MWh
Subregion
NPCC New England
2013
$3,495/kW
Est. Construction Cost
Total estimated cost: $344.2M
Point of Interconnection
Nearest Substation
SEMASS Substation · 115 kV
Substation Distance
< 10 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
SEMASS
Pricing Hub
.H.INTERNAL_HUB
Node Source
EIA-860 direct report
Last updated 2026-03-26
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