Exelon West Medway II LLC
9 Summer St, Medway, MA 2053Plant Summary Information
Exelon West Medway II LLC is ranked #20 out of 654 power plants in Massachusetts in terms of total annual net electricity generation.
Exelon West Medway II LLC is comprised of 2 generators and generated 41.8 GWh during the 3-month period between May 2026 to August 2026.
| Plant Name | Exelon West Medway II LLC |
|---|---|
| Utility Name | Constellation Power, Inc |
| Location | Norfolk County, MA |
| Initial Operation Date | March 2019 |
| Last Update | Aug 2026 |
| Annual Generation | 228.1 GWh |
| Annual Consumption | 2.5 M MMBtu |
| Ranked #2,426 out of 13,301 Power Plants Nationwide | |
| Ranked #734 out of 2,218 Natural Gas Power Plants Nationwide | |
| Ranked #20 out of 654 Massachusetts Power Plants | |
| Ranked #13 out of 44 Massachusetts Natural Gas Power Plants | |
| Fuel Types | Natural Gas : 94.6% Kerosene : 5.4% |
| Previous Operator |
Exelon Power (2014 to 2021) Constellation Power, Inc (2022 to 2025) |
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Monthly Net Generation for Exelon West Medway II LLC
Monthly Plant Fuel Consumption for Exelon West Medway II LLC
Exelon West Medway II LLC Details
| Summary Information | |
|---|---|
| Plant Name | Exelon West Medway II LLC (59882) |
| Plant Address | 9 Summer St, Medway, MA 2053 |
| Utility | Constellation Power, Inc (6035) |
| Latitude, Longitude | 42.13722, -71.4447 |
| Generation Dates on File | May 2019 to Aug 2026 |
| Initial Operation Date | March 2019 |
| Annual Generation | 228.1 GWh |
| Fuel Types | Natural Gas : 94.6% Kerosene : 5.4% |
| Federal Energy Regulatory Commission (FERC) Information | |
| FERC Cogeneration Status | No |
| FERC Small Power Producer Status | No |
| FERC Exempt Wholesale Generator Status | Yes |
| FERC Exempt Wholesale Generator Docket Number | 98-42-000 |
| Regulatory Information | |
|---|---|
| Regulatory Status | Non-Regulated |
| NERC Region | NPCC |
| Balancing Authority | ISO New England Inc. (ISNE) |
| NAICS Code | Utilities (22) |
| Sector | IPP Non-CHP (2) |
| Water Source | |
| Ash Impoundment | No |
| Transmission / Distribution Owner | NSTAR Electric Company (54913) MA |
| Grid Voltage | 115.00 kV |
| Energy Storage | No |
| Natural Gas Information | |
| Pipeline Name | Algonquin Gas Transmission Company |
| Natural Gas Storage | No |
Generator 4 Details Operating March 2019
| Technology | Natural Gas Fired Combustion Turbine |
|---|---|
| Prime Mover | Combustion Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | UN.MEDWAY 13.8WMJ4 |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | UN.MEDWAY 13.8WMJ4 |
| Nameplate Capacity | 131.8 MW |
| Nameplate Power Factor | 0.85 |
| Summer Capacity | 94.4 MW |
| Winter Capacity | 103.5 MW |
| Minimum Load | 25 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
| First Operation Date | March 2019 |
|---|---|
| Combined Heat & Power | No |
| Sector Name | IPP Non-CHP (2) |
| Energy Source | Natural Gas / Kerosene |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 10M |
| Other Planned Modifications | No |
| Multiple Fuels | Yes |
| Cofire Fuels | No |
| Switch Between Oil And Natural Gas | Yes |
| Multifuel Details | |
| Switch When Operating | Yes |
|---|---|
| Net Summer Capacity With Natural Gas | 94.4 MW |
| Net Winter Capacity With Natural Gas | 103.5 MW |
| Net Summer Capacity With Oil | 94.4 MW |
| Net Winter Capacity With Oil | 100 MW |
| Time To Switch From Gas To Oil | 1H |
| Time To Switch From Oil To Gas | 1H |
| Factors That Limit Switching | No |
Generator 5 Details Operating May 2019
| Technology | Natural Gas Fired Combustion Turbine |
|---|---|
| Prime Mover | Combustion Turbine |
| Ownership | Single Owner |
| RTO ISO LMP Node Designation | UN.MEDWAY 13.8WMJ5 |
| RTO ISO Location Designation For Reporting Wholesale Sales Data | UN.MEDWAY 13.8WMJ5 |
| Nameplate Capacity | 131.8 MW |
| Nameplate Power Factor | 0.85 |
| Summer Capacity | 94.2 MW |
| Winter Capacity | 103.5 MW |
| Minimum Load | 25 MW |
| Uprate/Derate Completed | No |
| Status | Operating |
| First Operation Date | May 2019 |
|---|---|
| Combined Heat & Power | No |
| Sector Name | IPP Non-CHP (2) |
| Energy Source | Natural Gas / Kerosene |
| Solid Fuel Gasification | No |
| Carbon Capture Technology | No |
| Time From Cold Shutdown To Full Load | 10M |
| Other Planned Modifications | No |
| Multiple Fuels | Yes |
| Cofire Fuels | No |
| Switch Between Oil And Natural Gas | Yes |
| Multifuel Details | |
| Switch When Operating | Yes |
|---|---|
| Net Summer Capacity With Natural Gas | 94.2 MW |
| Net Winter Capacity With Natural Gas | 103.5 MW |
| Net Summer Capacity With Oil | 94.2 MW |
| Net Winter Capacity With Oil | 100 MW |
| Time To Switch From Gas To Oil | 1H |
| Time To Switch From Oil To Gas | 1H |
| Factors That Limit Switching | No |
Exelon West Medway II LLC Plant Owners
| Owner Name | Address | Generator | Ownership | We couldn't locate any owners for this plant |
|---|
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|---|---|---|---|
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| Milford Power LP | Milford, MA | 253.3 GWh | 3.5 mi |
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