Power plants in Middlesex County, Massachusetts
59 operating power plants in Middlesex County, Massachusetts, with 474 MW of nameplate capacity, largest first. From EIA-860M, August 2026.
Plants
59
Nameplate capacity
474 MW
Net generation, 2025
2.01 TWh
57 of 59 plants reported
Largest power plants in Middlesex County
| # | Plant | MW | GWh, 2025 | Capacity factor |
|---|---|---|---|---|
| 1 | Kendall Square StationNatural gas | 235 | 1,535 | 74.7% |
| 2 | Mass Inst Tech Cntrl Utilities/Cogen PltNatural gas | 43 | 209 | 55.1% |
| 3 | Boott HydropowerHydro | 23 | 60.8 | 30.3% |
| 4 | Cherry StreetNatural gas and oil | 13 | 0.3 | – |
| 5 | Blodgett Solar CSGSolar and battery storage | 10 | 9.3 | 21.4% |
| 6 | Dunstable Solar 1, LLCSolar and battery storage | 9.0 | 8.4 | 21.4% |
| 7 | ShafferSolar | 5.0 | 6.4 | 14.7% |
| 8 | Minuteman Energy StorageBattery storage | 5.0 | −0.2 | – |
| 9 | HudsonSolar | 5.0 | 5.4 | 12.3% |
| 10 | Kearsarge Riverpark I LLCBattery storage | 5.0 | −0.1 | – |
| 11 | Kearsarge Riverpark II LLCBattery storage | 5.0 | −0.1 | – |
| 12 | Wakefield MA BESS 1Battery storage | 5.0 | −0.3 | – |
| 13 | Syncarpha Tewksbury Hybrid CSGSolar and battery storage | 4.8 | 3.9 | 16.3% |
| 14 | Iron Horse Solar 4, LLCSolar | 4.5 | 7.1 | 18.0% |
| 15 | Kearsarge Concord IISolar | 4.5 | 6.6 | 16.7% |
| 16 | Ashland SolarSolar | 4.5 | 6.4 | 16.3% |
| 17 | West Groton CHPNatural gas | 4.1 | 20.9 | 58.3% |
| 18 | Westford Solar ParkSolar | 4.0 | 4.1 | 11.6% |
| 19 | GSPP Boxborough Littleton (MA)Solar | 4.0 | 6.2 | 17.6% |
| 20 | Nextsun Energy LittletonSolar | 3.8 | 5.1 | 15.3% |
| 21 | CoreSite - SomervilleNatural gas | 3.6 | 27.8 | 88.2% |
| 22 | DevensSolar | 3.0 | 4.6 | 17.4% |
| 23 | Beebe Substation Battery StorageBattery storage | 3.0 | −0.0 | – |
| 24 | Leominster (MA)-South Street-R&DSolar | 2.9 | 3.4 | 13.2% |
| 25 | Iron Horse Solar I CSGSolar | 2.9 | 4.1 | 16.1% |
| 26 | Natick MallSolar | 2.7 | – | – |
| 27 | Tyngsborough SolarSolar | 2.6 | 3.2 | 14.3% |
| 28 | EBZ SolarSolar | 2.5 | 3.4 | 15.3% |
| 29 | Centaurus Solar - MASolar | 2.4 | 3.1 | 14.6% |
| 30 | Bourne (MA) - Holliston ISolar | 2.3 | 3.5 | 17.2% |
| 31 | GELD Solar FarmSolar | 2.3 | 3.3 | 16.3% |
| 32 | BWC Stony Brook, LLC HybridSolar and battery storage | 2.3 | 1.8 | 12.7% |
| 33 | Pepperell Hydro Power PlantHydro | 2.2 | 3.8 | 19.5% |
| 34 | GSPP Devens, LLCSolar | 2.2 | 3.0 | 15.5% |
| 35 | Acton-Boxborough Schools BESSBattery storage | 2.1 | −0.1 | – |
| 36 | Stow PVSolar | 2.0 | 2.5 | 14.4% |
| 37 | Shirley WaterSolar | 2.0 | 2.8 | 16.2% |
| 38 | Wilmington SolarSolar | 2.0 | 2.0 | 11.2% |
| 39 | Hopkinton CSGSolar | 2.0 | 2.8 | 16.2% |
| 40 | Groton BESS 2Battery storage | 2.0 | −0.4 | – |
| 41 | Groton BESS 1Battery storage | 2.0 | −0.3 | – |
| 42 | Equinix - BillericaNatural gas | 1.9 | 14.5 | 87.0% |
| 43 | Ashby Duffy CSG Solar FarmSolar | 1.8 | 3.0 | 19.3% |
| 44 | Weston Landfill SolarSolar | 1.8 | 2.8 | 17.5% |
| 45 | Newton Rumford LandfillSolar | 1.7 | 2.2 | 14.8% |
| 46 | Town of Lexington SolarSolar | 1.6 | 2.5 | 18.1% |
| 47 | Kearsarge WilmingtonSolar | 1.6 | 2.1 | 15.2% |
| 48 | Acton Solar LandfillSolar | 1.5 | 0.5 | 3.6% |
| 49 | Concord Solar FarmSolar | 1.5 | 1.9 | 14.8% |
| 50 | Holliston LLCSolar | 1.5 | 1.8 | 13.9% |
| 51 | Lincoln Public SchoolsSolar and battery storage | 1.5 | – | – |
| 52 | Sudbury LandfillSolar | 1.3 | 1.3 | 11.1% |
| 53 | Lowell Solar LandfillSolar | 1.3 | 1.2 | 10.2% |
| 54 | DDR Shoppers WorldSolar | 1.3 | 1.9 | 16.4% |
| 55 | WoburnSolar | 1.3 | 2.0 | 17.8% |
| 56 | Maynard PVSolar | 1.0 | 1.2 | 14.1% |
| 57 | Framingham State University PlantSolar | 1.0 | 0.0* | 0.1% |
| 58 | Holliston Solar CSGSolar | 1.0 | 1.5 | 16.7% |
| 59 | Shirley LandfillSolar | 1.0 | 1.3 | 15.1% |
* Fewer than 12 months of 2025 reported, so the total is partial.
MW is the nameplate capacity of operating generators and batteries. Source: EIA-860M August 2026, published 2026-09-24, and EIA-923 2025. Page updated 2026-10-04. Data sources
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Other counties in Massachusetts
Worcester County188 plants · 1,953 MWHampden County79 plants · 1,402 MWPlymouth County69 plants · 473 MWBristol County65 plants · 592 MWBerkshire County42 plants · 1,024 MWHampshire County38 plants · 160 MWNorfolk County37 plants · 2,731 MWEssex County33 plants · 1,151 MWFranklin County33 plants · 1,334 MW