Mass Save Sponsors by Massachusetts City
Look up your sponsor
Enter your Massachusetts city or town to see which utility files your Mass Save rebate — or whether you're served by a Municipal Light Plant.
Covers 60+ MA municipalities plus the known MLP towns. If your town isn't listed, check your most recent electric and gas bills — the utility name is your Mass Save sponsor.
The six Mass Save sponsors
Every Massachusetts Mass Save rebate filing flows through one of six sponsor utilities. The sponsor is determined by your address — specifically, which utility's distribution wires (electric) or pipes (gas) serve your meter.
- Eversource
electric + gas (post-Columbia)
- National Grid
electric + gas
- Unitil
electric + gas (north-central MA)
- Cape Light Compact
electric (Cape Cod & Martha's Vineyard)
- Berkshire Gas
gas (western MA)
- Liberty Utilities
gas (Fall River and parts of southeast MA — Bellingham, Blackstone, North Attleboro, Plainville, Somerset, Swansea, Westport, Wrentham)
Sponsor by city — at a glance
| City | County | Electric sponsor | Gas sponsor |
|---|---|---|---|
| Boston | Suffolk | Eversource | National Grid |
| Worcester | Worcester | National Grid | National Grid |
| Springfield | Hampden | Eversource | Eversource |
| Cambridge | Middlesex | Eversource | Eversource |
| Lowell | Middlesex | National Grid | National Grid |
| Brockton | Plymouth | National Grid | Eversource |
| Quincy | Norfolk | National Grid | National Grid |
| Lynn | Essex | National Grid | National Grid |
| New Bedford | Bristol | Eversource | Eversource |
| Fall River | Bristol | National Grid | Liberty Utilities |
| Newton | Middlesex | Eversource | National Grid |
| Somerville | Middlesex | Eversource | National Grid |
Gas sponsor "Eversource" reflects Eversource Gas of Massachusetts, the post-2020 successor to Columbia Gas of MA / NSTAR Gas. All city-by-city sponsor mappings were verified 2026-05-27 against masssave.com and the utility company territory maps.
MLP (Municipal Light Plant) communities — not in Mass Save
Forty-one Massachusetts cities and towns operate Municipal Light Plants instead of receiving electric service from an investor-owned utility. These customers do not pay into the Energy Efficiency Charge that funds Mass Save, and are therefore not eligible for Mass Save rebates or the HEAT Loan. The most common MLP cities and towns include:
- Belmont, Braintree, Reading, Wakefield, Concord, Hingham, Holyoke, Mansfield, Marblehead, Middleborough, Norwood, Peabody, Shrewsbury, Taunton, Wellesley, Westfield
- Chicopee, Ipswich, Holden, Hull, Danvers, Ashburnham, Boylston, Boxborough, Groton, Paxton, Russell, South Hadley, Sterling, Templeton, Hudson, Littleton, Princeton, Rowley, Georgetown, Groveland, Merrimac, Falmouth, Gosnold, Chester, Dighton
MLP customers should check directly with their light plant for rebate programs. Many MLPs offer comparable heat pump rebates ($1,000–$3,000 range) and, where the customer is otherwise eligible, the Massachusetts MLP Zero-Interest Energy Efficiency Loan (0% APR up to $25,000) operates statewide as the MLP analog to the Mass Save HEAT Loan. Mass.gov reference.
How to confirm your sponsor in two minutes
- Look at your most recent electric bill — the utility name at the top is your Mass Save electric sponsor (or the MLP that excludes you).
- Look at your most recent gas bill — same rule for gas.
- If you have only one fuel (e.g. all-electric home with no gas service), your single sponsor handles all Mass Save filings for your address.
- If you've recently moved or changed utility account, Mass Save eligibility transfers with the address — but your name needs to be on the current bill for a rebate filing.
Sponsor FAQ
- How many sponsors does Mass Save have?
- Six. Eversource, National Grid, Unitil, Cape Light Compact, Berkshire Gas, and Liberty Utilities. The list has been stable since the early 2020s; the most recent meaningful change was Eversource's 2020 acquisition of Columbia Gas of Massachusetts (now Eversource Gas).
- How do I know which Mass Save sponsor serves my house?
- Check your most recent electric and gas bills. The utility name on the bill is your Mass Save sponsor. In mixed-fuel households (electric heat or AC on one utility, gas appliances on another) Mass Save rebates for heat pumps usually file through the electric sponsor; gas furnace and water heater rebates file through the gas sponsor.
- My city has a Municipal Light Plant. Am I out of luck?
- No, but Mass Save will not work for you. MLP residents in Belmont, Braintree, Reading, Wakefield, Concord, Hingham, Holyoke, and roughly 35 other communities use their MLP's own rebate program (e.g. BELD's Heat Pump Rebate in Braintree, RMLD's rebates in Reading). Many MLPs offer comparable heat pump rebates; some offer the MLP Zero-Interest Energy Efficiency Loan at 0% APR up to $25,000.
- What's the difference between an investor-owned utility and an MLP?
- Investor-owned utilities (IOUs) are private companies regulated by the MA Department of Public Utilities — Eversource, National Grid, Unitil, etc. Municipal Light Plants are city- or town-owned utilities, governed by local boards rather than the DPU. The Mass Save program runs on funds collected from IOU ratepayers, which is why MLP customers (who don't pay into those funds) are excluded.
- Eversource Gas, Eversource Electric, NSTAR Gas, Columbia Gas — same company?
- Eversource Electric and Eversource Gas of Massachusetts are both subsidiaries of Eversource Energy. Eversource Gas was formed in 2020 when Eversource acquired Columbia Gas of Massachusetts (the former NiSource gas subsidiary). Many older sources still refer to it as "Columbia Gas," but the brand is Eversource Gas as of 2026. For Mass Save purposes both are simply "Eversource" sponsors.
See your sponsor — and what they'll rebate
Submit your city and we'll route your quote request to a Mass Save HPIN installer who works with your sponsor.