Exelon West Medway II LLC
Natural gas power plant in Norfolk County, Massachusetts. 263.6 MW of nameplate capacity across 2 generators, operated by Constellation Power, Inc.
Also known as Exelon Power West Medway Generating Station II · EIA plant 59882
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Key facts
- Capacity
- 263.6 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- March 2019First generator online
- Operator
- Constellation Power, IncEIA operator ID 6035
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 2 ISONE nodesResource nodes with prices
- Location
- Norfolk County, MA42.1372, −71.4447
- EIA plant ID
- 59882EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Exelon West Medway II produces
Free · EIA-923Net generation, 2025
211 GWh
210,885 MWh, final
Capacity factor, 2025
9.1%
2024: 8.7%
January to July 2026
107 GWh
Provisional
Range, 2020 to 2025
190.9–210.9
GWh a year. Low 2021, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | 114,637 | Not reported | 8 of 12 |
| 2020 | 195,612 | 11.1% | 12 of 12 |
| 2021 | 190,906 | Not reported | 12 of 12 |
| 2022 | 36,891 | 4.9% | 4 of 12 |
| 2023 | 8,078 | 4.1% | 1 of 12 |
| 2024 | 201,172 | 8.7% | 12 of 12 |
| 2025 | 210,885 | 9.1% | 12 of 12 |
| 2026 (provisional, partial year) | 107,089 | 8.0% | 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 · ISONEEmissions
Free · EPA CAMPDCO₂, 2025
119,905
US short tons. 2024: 113,329
SO₂, 2025
1
US short tons
NOx, 2025
11
US short tons
CO₂ per MWh, calculated
0.57 t
About 1,137 lb per MWh
2 of 2 EPA units reported CO₂ in 2025 (J4, J5), matched to EIA plant 59882 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 |
|---|---|---|---|
| 4 | Natural Gas Fired Combustion Turbine | 131.8 | March 2019 |
| 5 | Natural Gas Fired Combustion Turbine | 131.8 | May 2019 |
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 Constellation Power, Inc 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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Power plants near Exelon West Medway II
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Questions about Exelon West Medway II
How much power does Exelon West Medway II LLC produce?
Exelon West Medway II LLC reported 210,885 MWh (211 GWh) of net generation in 2025, a 9.1% capacity factor on 263.6 MW of nameplate capacity. From January to July 2026 it reported 107 GWh, which is provisional.
Where is Exelon West Medway II LLC?
Exelon West Medway II LLC is in Norfolk County, Massachusetts, at 42.1372, −71.4447. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Exelon West Medway II LLC?
EIA-860M for August 2026 lists Constellation Power, Inc as the operator (EIA operator ID 6035). The operator is not always the owner.
When did Exelon West Medway II LLC start operating?
Its first generator began operating in March 2019, according to EIA-860M.
Does InfraMap have power prices for Exelon West Medway II LLC?
Yes. InfraMap has ISONE day-ahead and real-time prices at 2 price nodes linked to Exelon West Medway II LLC, 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)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- 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