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Get a Free QuoteMansfield isn't on Eversource or National Grid — it's on MMED, the town's own municipal light plant. That means a lower per-kWh rate and a separate stack of local rebates, run through NextZero instead of Mass Save.
Verified July 2026 against mansfieldelectric.com (MMED) and the ENE / NextZero rebate portal. Federal 25D solar and 25C heat pump credits expired Dec 31, 2025; 30C EV charger credit expired June 30, 2026.
Mansfield is served by the Mansfield Municipal Electric Department (MMED), a municipal light plant that sets its own residential rate — well below the Eversource and National Grid rates most Massachusetts homes pay. Because it is a municipal, MMED also funds its own incentives instead of Mass Save: a $1.20/watt solar rebate (up to 50% of cost), up to $700 for an EV charger, and heat pump, weatherization, and Connected Homes demand-response programs. Your exact per-kWh rate is on your MMED bill.
A municipal light plant buys power wholesale and owns its own local grid, so it skips the shareholder return baked into an investor-owned utility's rate. Here is MMED's residential rate next to the two utilities most Massachusetts homes are on.
Rates shown are each utility's all-in bundled residential rate from NuWatt's canonical utility database. A dash means the figure isn't on file rather than a rate of zero.
The average Massachusetts home uses roughly 600–650 kWh a month. Slide to your own usage.
MMED saves about $1,461 a year at this usage vs Eversource (MA).
MMED saves about $1,703 a year at this usage vs National Grid (MA).
Directional estimate on each utility's all-in bundled residential rate (MMED as of Mar 2026). Excludes fixed monthly customer charges and the seasonal Purchased Power Cost Adjustment. Confirm your exact rate on your MMED bill.
An MMED bill looks different from an Eversource or National Grid bill because there is no separate “supplier” line and no competitive-supply solicitations — MMED is your supplier and your wires company. Four pieces make up the rate you actually pay per kilowatt-hour:
A fixed charge that appears every month regardless of how much electricity you use. It keeps the account and meter on the system.
The per-kWh charge for the electricity itself. As a municipal, MMED buys power wholesale and passes it through without an investor-owned utility markup.
A per-kWh adjustment that rises and falls with what MMED pays on the wholesale market. It resets periodically, so the all-in rate moves with fuel and market costs rather than an annual rate case.
The cost of running the poles, wires, and local grid that MMED owns and maintains inside Mansfield. Municipal distribution costs are typically lower than an investor-owned utility earning a regulated return.
Why the rate moves.The Purchased Power Cost Adjustment is the piece that changes most — it tracks what MMED pays on the wholesale market and resets periodically. That is different from an investor-owned utility, whose supply rate resets on a fixed seasonal schedule through a state rate case. Check your latest bill for the current PPCA line.
Because Mansfield funds its own programs, the incentives here are different from the statewide Mass Save menu. The solar and EV amounts are published; for the rest, we point you to the current MMED form rather than print a figure that changes by program year.
MMED pays $1.20 per watt of installed solar capacity, capped at 50% of your total installed cost. Systems must be 20 kW or smaller, have less than 20% shading, and face roughly south (an azimuth of 90–270°). You must be an MMED electric customer.
MMED covers the cost of a qualifying Level 2 home charger up to $700 (the purchase price, excluding shipping and tax). You must have it installed by a licensed electrician in Mansfield and enroll in the NextZero Connected Homes managed-charging program.
MMED offers a rebate for ENERGY STAR cold-climate air-source heat pumps installed during the 2026 program year through NextZero. Because MMED does not publish the per-ton amount on a page we can read directly, we route you to the current MMED heat pump rebate form for the exact figure rather than printing a number that could be out of date.
A rebate is available for ENERGY STAR certified heat pump water heaters. Confirm the current amount and eligibility on the MMED / NextZero rebate form before you buy.
MMED rebates eligible air-sealing and insulationmeasures — but only those recommended by a home energy assessment. Book the assessment first; it defines which measures qualify.
Enroll qualifying Wi-Fi devices — smart thermostats, home batteries, EV chargers, smart water heaters, and mini-split controllers — and MMED pays recurring bill credits for letting it make brief adjustments during peak demand. Amounts vary by device; confirm the current per-device credit when you enroll.
On the unpublished amounts.MMED updates its heat pump, water heater, weatherization, and Connected Homes figures by program year and does not post every per-measure dollar amount where it can be verified automatically. We deliberately don't print those numbers here — a stale figure is worse than none. Confirm the live amounts on the MMED / NextZero rebate forms, or ask us to pull them for your specific project.
Solar economics in Mansfield work differently from the rest of Massachusetts on two fronts: the rebate is a municipal one, and net metering is set by MMED — not by the state statute or the SMART program that govern the investor-owned utilities.
MMED pays $1.20 per watt of installed capacity, capped at 50% of your installed cost, for systems 20 kW or smaller with less than 20% shading and a roughly south-facing array. That rebate is unusual for a municipal and materially lowers the net cost of a Mansfield system.
MMED credits excess generation to your account as monthly bill credits under its own Net Metering Rate 149. Municipal light plants aren't bound by the state net-metering law or SMART, so MMED sets the credit value itself — confirm the current terms before sizing a system.
Solar and net-metering questions go to Hamid Jaffari at MMED, (508) 261-7361. We confirm the live credit value and rebate terms with MMED at design time so nothing is assumed.
The single biggest driver of heat pump operating cost is the price per kilowatt-hour of the electricity running it. Mansfield's municipal rate is lower than the investor-owned utility rates that dominate the statewide heat pump math, which quietly improves the running-cost comparison against oil and propane for a Mansfield home — before any rebate.
A heat pump moves your heating load from a delivered fuel onto your electric bill. On MMED's lower per-kWh rate, every therm-equivalent you shift lands at a lower price than it would on Eversource or National Grid, so the payback against oil or propane is faster here than the statewide averages suggest.
Mansfield's cold-climate heat pump rebate runs through NextZero, and Connected Homes can add recurring bill credits if you enroll the system. Confirm the current 2026 heat pump amount on the MMED form — and remember the federal 25C credit is gone, so the municipal program is the incentive.
This trips up a lot of Mansfield homeowners, because the big statewide ads are everywhere. Mass Save is funded by a surcharge on investor-owned utility bills. MMED customers don't pay the electric side of that surcharge, so they can't use Mass Save electric rebates — but the gas side can be a different story.
| Your situation | Mass Save eligibility | What you use instead |
|---|---|---|
| MMED electric customer (everyone in Mansfield) | Not eligible for Mass Save electric rebates | Use MMED / NextZero electric programs (solar, heat pump, EV, weatherization) |
| Home also heats with natural gas | Eligible for gas-side Mass Save through the gas utility | Eversource Gas of Massachusetts funds the gas efficiency programs you pay into |
| Home heats with oil, propane, or electric only | No Mass Save pathway | MMED / NextZero rebates are the incentive set for these homes |
The short version.For electricity — solar, EV charging, whole-home heat pumps — a Mansfield home uses MMED's own programs, never Mass Save. If the same home also has natural gas (Eversource Gas of Massachusetts serves the town where gas is available), gas-side Mass Save offers still run through that gas utility. Homes on oil, propane, or all-electric heat have no Mass Save pathway at all and rely entirely on MMED.
We confirm your live MMED rate, the current rebate amounts, and Net Metering Rate 149 terms before we design — so the numbers are Mansfield's, not a statewide average.
Mansfield is served by the Mansfield Municipal Electric Department (MMED), a municipal light plant that sets its own residential rate rather than following the state investor-owned utilities. MMED’s all-in bundled residential rate runs well below the rates Eversource and National Grid charge most Massachusetts households. Your exact rate appears on your MMED bill and is made up of a fixed monthly customer charge, a per-kWh base energy charge, a Purchased Power Cost Adjustment that resets with wholesale market costs, and local distribution charges. Because MMED buys power wholesale and owns its own local grid, it avoids the investor-owned utility markup, which is why the per-kWh figure is lower.
How solar credits work by utility — including why municipal light plants set their own terms.
Every MA municipal utility’s solar and rebate posture, side by side.
The statewide investor-owned program — for reference, since MMED customers use NextZero instead.
What a cold-climate heat pump actually costs to install in MA.
The operating-cost math that shifts when your electric rate is a municipal rate.
The full statewide rebate program that MMED customers are outside of on the electric side.
We design on MMED's actual rate and Net Metering Rate 149, capture the $1.20/watt solar rebate and the up-to-$700 EV charger rebate, and confirm the live 2026 heat pump amount with MMED — so your numbers are Mansfield's, not a statewide average.
