Exelon Medway LLC
Oil power plant in Norfolk County, Massachusetts. 135 MW of nameplate capacity across 3 generators, operated by Constellation Power, Inc.
Also known as Exelon Power West Medway Generating Station I · EIA plant 1592
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Key facts
- Capacity
- 135 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- July 1970First generator online
- Operator
- Constellation Power, IncEIA operator ID 6035
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 3 ISONE nodesResource nodes with prices
- Location
- Norfolk County, MA42.1400, −71.4464
- EIA plant ID
- 1592EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Exelon Medway produces
Free · EIA-923Net generation, 2025
4.44 GWh
4,440 MWh, final
Capacity factor, 2025
0.4%
2024: 0.2%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
1.1–4.4
GWh a year. Low 2020, high 2025
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 1,721 | Not reported | 12 of 12 |
| 2001 | 3,139 | Not reported | 12 of 12 |
| 2002 | 3,193 | Not reported | 12 of 12 |
| 2003 | 1,533 | Not reported | 11 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | 1,778 | Not reported | 12 of 12 |
| 2006 | 1,619 | Not reported | 12 of 12 |
| 2007 | 1,447 | Not reported | 12 of 12 |
| 2008 | 1,750 | Not reported | 12 of 12 |
| 2009 | 2,704 | Not reported | 12 of 12 |
| 2010 | 2,809 | 0.2% | 12 of 12 |
| 2011 | 2,673 | 0.2% | 12 of 12 |
| 2012 | 1,363 | 0.1% | 12 of 12 |
| 2013 | 2,250 | 0.2% | 12 of 12 |
| 2014 | 7,776 | 0.7% | 12 of 12 |
| 2015 | 2,223 | 0.2% | 12 of 12 |
| 2016 | 3,412 | 0.3% | 12 of 12 |
| 2017 | 3,394 | 0.3% | 12 of 12 |
| 2018 | 4,329 | 0.4% | 12 of 12 |
| 2019 | 1,266 | 0.1% | 12 of 12 |
| 2020 | 1,134 | 0.1% | 12 of 12 |
| 2021 | 1,452 | 0.1% | 12 of 12 |
| 2022 | 2,863 | 0.2% | 12 of 12 |
| 2023 | 3,725 | 0.3% | 12 of 12 |
| 2024 | 1,985 | 0.2% | 12 of 12 |
| 2025 | 4,440 | 0.4% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 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
10,955
US short tons. 2024: 5,185
SO₂, 2025
Not reported
US short tons
NOx, 2025
36
US short tons
CO₂ per MWh, calculated
2.47 t
About 4,935 lb per MWh
6 of 6 EPA units reported CO₂ in 2025 (J1T1, J1T2, J2T1, J2T2, J3T1, J3T2), matched to EIA plant 1592 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 |
|---|---|---|---|
| GT1 | Petroleum Liquids | 45.0 | July 1970 |
| GT2 | Petroleum Liquids | 45.0 | March 1971 |
| GT3 | Petroleum Liquids | 45.0 | July 1970 |
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 Medway
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Questions about Exelon Medway
How much power does Exelon Medway LLC produce?
Exelon Medway LLC reported 4,440 MWh (4.44 GWh) of net generation in 2025, a 0.4% capacity factor on 135 MW of nameplate capacity.
Where is Exelon Medway LLC?
Exelon Medway LLC is in Norfolk County, Massachusetts, at 42.1400, −71.4464. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Exelon Medway 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 Medway LLC start operating?
Its first generator began operating in July 1970, according to EIA-860M.
Does InfraMap have power prices for Exelon Medway LLC?
Yes. InfraMap has ISONE day-ahead and real-time prices at 3 price nodes linked to Exelon Medway 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