EXELON MEDWAY LLC
OperatingOil power plant
- Capacity
- 135 MW
- Primary fuel
- Oil
- County
- Norfolk County
- Operator
- EXELON POWER
- Status
- Operating
- Commissioned
- 1970
- EIA plant ID
- 1592
- Generators
- 3
- Technology
- Petroleum Liquids
- Net generation (2024)
- 2 GWh
- Capacity factor (2024, EIA nameplate)
- 0.2%
- Data vintage
- EIA-860 2024 final; EIA-923 2022-2024 final
- Coordinates
- 42.1400, -71.4464
EXELON MEDWAY LLC, a 135 MW Oil power plant in Norfolk County, Massachusetts. Operated by EXELON POWER, commissioned 1970.
How EXELON MEDWAY LLC compares
With 135 MW of capacity, EXELON MEDWAY LLC ranks 18th among the 125 operating power plants Bywatts maps in Massachusetts and 2nd of the 13 operating Oil plants in the state. It accounts for about 8.7% of Massachusetts's operating Oil capacity and 1.5% of all operating capacity in the state. Nationally it is the 30th-largest of the 544 operating Oil plants in the database. Commissioned in 1970, it is older than 77% of the 122 operating Massachusetts plants with a recorded commissioning year. Its operator, EXELON POWER, runs 2 operating plants in Massachusetts totaling 178 MW. It shares Norfolk County with 8 other operating plants, including FORE RIVER GENERATING STATION and ANP BELLINGHAM ENERGY PROJECT.
EIA-860 lists 3 generators at the site with 135 MW of nameplate capacity, all petroleum liquids technology. Net generation was 2 GWh in 2024 (a 0.2% capacity factor). Its generators came online between 1970 and 1971.
Grid neighborhood
The closest transmission line found within 10 miles is a 230 kV line, under 0.1 miles away. Another 31 operating power plants totaling 3,905 MW sit within 25 miles; the largest is ENTERGY RHODE ISLAND STATE ENERGY LP (596 MW, Natural Gas). Within 50 miles are 4 mapped data centers; the nearest is Equinix BO1 - Boston, Waltham in Waltham, about 19.8 miles away.
Computed by Bywatts from HIFLD power plant and transmission line records, EIA-860/923 survey data and PeeringDB data center locations; distances are straight-line. Sources and methodology
Weather peril exposure
EXELON MEDWAY LLC is a 135 MW oil power plant in Norfolk County, MA, operated by EXELON POWER, commissioned in 1970. Norfolk County carries low modeled catastrophe exposure in the FEMA National Risk Index, scoring 1.4 of 5 at the 10th national percentile. Hurricane is the leading peril, rated Relatively Moderate by FEMA at the 77th percentile.
The Bywatts loss layer is calibrated to solar PV hardware, so it is not applied to an oil plant. The ratings below are the FEMA National Risk Index county hazard ratings for this location.
Norfolk County hazard ratings
| Peril | FEMA rating | National percentile | Peril score | Events per year |
|---|---|---|---|---|
| Hurricane | Relatively Moderate | 77th | 4.1 of 5 | 0.18 |
| Coastal flooding | Relatively High | 75th | 4.0 of 5 | 7.9 |
| Earthquake | Relatively Moderate | 64th | 3.6 of 5 | <0.01 |
| Ice storm | Relatively High | 50th | 3.0 of 5 | 1.8 |
| Lightning | Relatively High | 33rd | 2.3 of 5 | 21.0 |
| Wildfire | Very Low | 25th | 2.0 of 5 | <0.01 |
| Riverine flooding | Relatively High | 22nd | 1.9 of 5 | 2.9 |
| Tornado | Relatively Moderate | 18th | 1.7 of 5 | 0.08 |
| Winter weather | Relatively Low | 14th | 1.6 of 5 | 13.0 |
| Strong wind | Relatively Moderate | 13th | 1.5 of 5 | 0.92 |
| Heat wave | Relatively Moderate | 7th | 1.3 of 5 | 6.1 |
| Hail | Very Low | 3rd | 1.1 of 5 | 1.8 |
Model hail, wind and flood exposure for Norfolk County in the weather risk calculator
Ratings are the FEMA National Risk Index county hazard ratings; the peril score is a Bywatts transform of the FEMA national percentile. Full data sources and the solar vulnerability methodology are in the weather risk calculator.
Modeled estimate for screening and negotiation. Built from FEMA National Risk Index county hazard data and a solar vulnerability layer documented above. Not a quote, a binder, or actuarial advice, and not a substitute for a carrier's own model. Hazard data: FEMA National Risk Index December 2025, synced 2026-07-24. Resolution is county level, not site level.