U.S. Electric Utility Directory · Massachusetts

Electric utilities in Massachusetts

Every electric utility serving Massachusetts in EIA data year 2025, with ownership type, grid operator, balancing authority, customers and the counties each one serves.

Compiled October 31, 2026. Grid operators present: ISO-NE, Other (no ISO).

Retail utilities485 investor-owned, 0 co-ops, 40 municipal
All entities116Including marketers and other filers
Counties covered14With at least one utility listed
Retail customers3,203,351Sum of utility customer counts

Retail electric utilities in Massachusetts

Sorted by customers. See Massachusetts on the map, and the state regulator, Department of Public Utilities.

48 retail utilities serving Massachusetts
UtilityEIA IDTypeISO or regionBalancing authorityCustomersCounties served
NSTAR Electric CompanyEversource (NSTAR Electric, MA)54913Investor-ownedISO-NEISNE1,428,06711 Barnstable, Berkshire, Bristol, Dukes, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk
Massachusetts Electric CoNational Grid MA (Massachusetts Electric)11804Investor-ownedISO-NEISNE1,317,66112 Barnstable, Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk, Worcester
City of Taunton18488MunicipalISO-NEISNE38,7281 Bristol
Town of Reading - (MA)15748MunicipalISO-NEISNE29,9081 Middlesex
Fitchburg Gas & Elec Light CoUnitil (Fitchburg Gas & Electric, MA)6374Investor-ownedISO-NEISNE29,9012 Middlesex, Worcester
City of Chicopee - (MA)3477MunicipalISO-NEISNE26,3101 Hampden
City of Peabody - (MA)14605MunicipalISO-NEISNE25,5351 Essex
City of Westfield - (MA)20481MunicipalISO-NEISNE18,0151 Hampden
City of Holyoke - (MA)8774MunicipalISO-NEISNE17,6571 Hampden
Town of Middleborough - (MA)12473MunicipalISO-NEISNE16,8531 Plymouth
Town of Braintree - (MA)2144MunicipalISO-NEISNE16,7141 Norfolk
Town of Shrewsbury - (MA)17127MunicipalISO-NEISNE16,3571 Worcester
City of Norwood - (MA)13839MunicipalISO-NEISNE15,8901 Norfolk
Nantucket Electric CoNational Grid MA (Nantucket Electric)13206Investor-ownedISO-NEISNE13,5792 Barnstable, Nantucket
Town of North Attleborough - (MA)13679MunicipalISO-NEISNE13,4141 Bristol
Town of Danvers5480MunicipalISO-NEISNE13,2811 Essex
Town of Hudson - (MA)8973MunicipalISO-NEISNE13,2541 Middlesex
Town of Wakefield - (MA)19979MunicipalISO-NEISNE12,9601 Middlesex
Town of Belmont - (MA)1523MunicipalISO-NEISNE11,6511 Middlesex
City of Marblehead - (MA)11624MunicipalISO-NEISNE10,2501 Essex
Town of Wellesley - (MA)20310MunicipalISO-NEISNE10,1251 Norfolk
Town of Mansfield - (MA)11586MunicipalISO-NEISNE9,9401 Bristol
City of Hingham - (MA)8796MunicipalISO-NEISNE9,8721 Plymouth
Town of Concord - (MA)4147MunicipalISO-NEISNE8,2961 Middlesex
Town of Holden - (MA)8715MunicipalISO-NEISNE8,1171 Worcester
Town of South Hadley - (MA)17560MunicipalISO-NEISNE8,0711 Hampshire
Town of Littleton - (MA)11085MunicipalISO-NEISNE7,3801 Middlesex
Town of Ipswich - (MA)9442MunicipalISO-NEISNE7,0361 Essex
Hull Municipal Light Plant8797MunicipalISO-NEISNE6,2161 Plymouth
Town of Groton - (MA)7715MunicipalISO-NEISNE4,8161 Middlesex
Town of Sterling - (MA)18087MunicipalISO-NEISNE3,8591 Worcester
Town of Middleton12477MunicipalISO-NEISNE3,7511 Essex
Town of West Boylston - (MA)20326MunicipalISO-NEISNE3,7031 Worcester
Town of Templeton - (MA)18546MunicipalISO-NEISNE3,6761 Worcester
Town of Georgetown - (MA)7130MunicipalISO-NEISNE3,5031 Essex
Town of Ashburnham - (MA)902MunicipalISO-NEISNE3,0651 Worcester
Town of Rowley - (MA)16377MunicipalISO-NEISNE3,0221 Essex
Town of Merrimac - (MA)12296MunicipalISO-NEISNE2,9841 Essex
Town of Groveland - (MA)7723MunicipalISO-NEISNE2,9681 Essex
Town of Boylston - (MA)2086MunicipalISO-NEISNE2,2841 Worcester
Town of Paxton - (MA)14585MunicipalISO-NEISNE1,9661 Worcester
Town of Princeton - (MA)15371MunicipalISO-NEISNE1,4851 Worcester
Town of Chester3447MunicipalISO-NEISNE7002 Berkshire, Hampden
City of Russell - (MA)16438MunicipalISO-NEISNE4621 Hampden
Massachusetts Bay Trans Authority49848Public power districtISO-NEISNE693 Middlesex, Norfolk, Suffolk
Massachusetts Mun Wholes Electric Co11806Public power districtISO-NE——0 —
New England Power Company13433Investor-ownedOther (no ISO)——0 —
University of Massachusetts AmherstNew since 201866866State authorityISO-NEISNE—1 Hampshire

Which utilities serve each county in Massachusetts

14 counties, with the grid operator serving most customers
CountyFIPSISO or regionUtilitiesUtilities serving the county
Barnstable25001ISO-NE3NSTAR Electric Company, Massachusetts Electric Co, Nantucket Electric Co
Berkshire25003ISO-NE3NSTAR Electric Company, Massachusetts Electric Co, Town of Chester
Bristol25005ISO-NE5NSTAR Electric Company, Massachusetts Electric Co, City of Taunton, Town of North Attleborough - (MA), Town of Mansfield - (MA)
Dukes25007ISO-NE1NSTAR Electric Company
Essex25009ISO-NE10Massachusetts Electric Co, City of Peabody - (MA), Town of Danvers, City of Marblehead - (MA), Town of Ipswich - (MA), Town of Middleton, Town of Georgetown - (MA), Town of Rowley - (MA), Town of Merrimac - (MA), Town of Groveland - (MA)
Franklin25011ISO-NE2NSTAR Electric Company, Massachusetts Electric Co
Hampden25013ISO-NE7NSTAR Electric Company, Massachusetts Electric Co, City of Chicopee - (MA), City of Westfield - (MA), City of Holyoke - (MA), City of Russell - (MA), Town of Chester
Hampshire25015ISO-NE4NSTAR Electric Company, Massachusetts Electric Co, Town of South Hadley - (MA), University of Massachusetts Amherst
Middlesex25017ISO-NE11NSTAR Electric Company, Massachusetts Electric Co, Town of Reading - (MA), Fitchburg Gas & Elec Light Co, Town of Hudson - (MA), Town of Wakefield - (MA), Town of Belmont - (MA), Town of Concord - (MA), Town of Littleton - (MA), Town of Groton - (MA), Massachusetts Bay Trans Authority
Nantucket25019ISO-NE1Nantucket Electric Co
Norfolk25021ISO-NE6NSTAR Electric Company, Massachusetts Electric Co, Town of Braintree - (MA), City of Norwood - (MA), Town of Wellesley - (MA), Massachusetts Bay Trans Authority
Plymouth25023ISO-NE5NSTAR Electric Company, Massachusetts Electric Co, Town of Middleborough - (MA), City of Hingham - (MA), Hull Municipal Light Plant
Suffolk25025ISO-NE3NSTAR Electric Company, Massachusetts Electric Co, Massachusetts Bay Trans Authority
Worcester25027ISO-NE11Massachusetts Electric Co, Town of Shrewsbury - (MA), Fitchburg Gas & Elec Light Co, Town of Holden - (MA), Town of Sterling - (MA), Town of West Boylston - (MA), Town of Templeton - (MA), Town of Ashburnham - (MA), Town of Boylston - (MA), Town of Paxton - (MA), Town of Princeton - (MA)

Retail power marketers and other entities in Massachusetts

Competitive suppliers, wholesale marketers, transmission-only companies and behind-the-meter providers that report to EIA for Massachusetts. They have no county service territory of their own.

EntityEIA IDTypeISO or regionCustomers
Public Power LLC (CT)58119Retail power marketerISO-NE229,233
Constellation NewEnergy, Inc13374Retail power marketerISO-NE112,600
Dynegy Energy Services, LLC59385Retail power marketerISO-NE75,898
NextEra Energy Services, LLC7279Retail power marketerISO-NE62,683
Direct Energy Services54820Retail power marketerISO-NE59,592
Reliant Energy Northeast LLC57037Retail power marketerISO-NE44,455
Viridian Energy LLC58161Retail power marketerISO-NE35,312
Verde Energy USA59620Retail power marketerISO-NE31,727
Ambit Energy Holdings, LLC56212Retail power marketerISO-NE23,210
Town Square Energy59059Retail power marketerISO-NE22,173
SolarCity Corporation57313Behind-the-meter providerISO-NE19,589
CleanChoice Energy, Inc.58951Retail power marketerISO-NE19,520
Just Energy9949Retail power marketerISO-NE15,702
Inspire Energy Holdings, LLC59310Retail power marketerISO-NE15,312
Direct Energy Business18193Retail power marketerISO-NE15,277
Energy Services Providers, Inc55874Retail power marketerISO-NE14,417
Clearview Electric Inc.58974Retail power marketerISO-NE13,844
Provider Power MASS, LLC58747Retail power marketerISO-NE12,942
Major Energy Electric Services56504Retail power marketerISO-NE12,276
Residents Energy, LLC59809Retail power marketerISO-NE10,625
Eligo Energy, LLC59054Retail power marketerISO-NE10,562
Think Energy, LLC65310Retail power marketerISO-NE9,313
SFE Energy Massachusetts, Inc.59734Retail power marketerISO-NE9,284
National Gas & Electric, LLC63232Retail power marketerISO-NE9,103
SmartEnergy Holdings, LLC58956Retail power marketerISO-NE9,010
Sunrun Inc.59647Behind-the-meter providerISO-NE8,645
Palmco Power MA, LLC59313Retail power marketerISO-NE8,334
XOOM Energy Massachusetts, LLC57489Retail power marketerISO-NE7,699
Hampshire Power Corporation67240Retail power marketerISO-NE6,988
First Point Power, LLC59793Retail power marketerISO-NE4,464
Spark Energy, LP17710Retail power marketerISO-NE4,337
Discount Power Inc - (CT)59993Retail power marketerISO-NE3,485
Energy Plus Holdings LLC56265Retail power marketerISO-NE3,359
EverBright, LLC66036Behind-the-meter providerISO-NE3,340
Sunnova59579Behind-the-meter providerISO-NE3,171
Renaissance Power & Gas, Inc.61059Retail power marketerISO-NE3,067
Summer Energy Northeast, LLC61200Retail power marketerISO-NE2,717
Hudson Energy Services55878Retail power marketerISO-NE2,406
Green Mountain Energy Company7554Retail power marketerISO-NE2,383
Atlantic Energy LLC60583Retail power marketerISO-NE1,538
ENGIE Resources LLC19107Retail power marketerISO-NE1,402
Palmetto Solar, LLC66026Behind-the-meter providerISO-NE1,255
Champion Energy Services54862Retail power marketerISO-NE748
SunPower Capital, LLC59580Behind-the-meter providerISO-NE499
Greenbacker Renewable Energy Corporation60025Behind-the-meter providerISO-NE451
Spruce Finance59943Behind-the-meter providerISO-NE337
BP Energy Retail LLC64314Retail power marketerISO-NE332
Maven Energy, LLC67751Retail power marketerISO-NE316
Great American Gas & Electric, LLC67589Retail power marketerISO-NE249
Nordic Energy Services, LLC59088Retail power marketerISO-NE134
SmartestEnergy US LLC63356Retail power marketerISO-NE130
David Energy Supply LLC66867Retail power marketerISO-NE80
Calpine Energy Solutions, LLC16840Retail power marketerISO-NE60
Texas Retail Energy, LLC50046Retail power marketerISO-NE49
TerraForm US Energy Services, LLC60981Behind-the-meter providerISO-NE26
Ahana Renewables, LLC59622Behind-the-meter providerISO-NE6
Grid Power Direct, LLC64222Retail power marketerISO-NE6
Constellation Solar Holding, LLC59086Behind-the-meter providerISO-NE3
Greenskies Renewable Energy, LLC61823Behind-the-meter providerISO-NE2
Aggregated Transit Energy59679Retail power marketerISO-NE1
Devonshire Energy, LLC56521Retail power marketerISO-NE1
Freedom Energy54873Retail power marketerISO-NE1
Harvard Dedicated Energy Limit49987Retail power marketerISO-NE1
Linde Energy Services, Inc.1611Retail power marketerISO-NE1
Titan Gas LLC59065Retail power marketerISO-NE1
Boston Energy Trading and Marketing LLC3601Wholesale marketerOther (no ISO)—
New England Hydro-Tran Elec Co13355Transmission-onlyOther (no ISO)—
New England Hydro-Trans Corp13356Transmission-onlyOther (no ISO)—

About this data

Which utilities exist comes from the U.S. Energy Information Administration’s Form EIA-861 and EIA-861S, data year 2025 (final release, October 7, 2026), read directly from eia.gov. County service territories, balancing authority codes and customer counts come from EIA-861 for 2018, the latest year compiled at county level for this directory; utilities that started reporting after 2018 carry their 2025 values. County boundaries are U.S. Census cartographic boundaries (us-atlas 3.0, Albers USA projection).

Customer counts are per utility within Massachusetts. A county’s grid operator is the one serving most of its customers, estimated by spreading each utility’s customers evenly over its counties. Download every state in one file from the U.S. Electric Utility Directory.

Find out what your bills should have cost.

Send one recent bill per site, or a list of accounts. We tell you where we expect findings before you sign anything. No upfront audit fee.

Request a bill review Call (801) 826-4800