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Get a Free QuoteWellesley isn't on Mass Save — it's on WMLP's own program. Remove your old fossil system and WMLP pays a flat $8,500 for a whole-home heat pump. It's the only Massachusetts municipal that rewards decommissioning.
Verified June 10, 2026 against wellesleyma.gov/1641. Federal 25C credit EXPIRED Dec 31, 2025.
Wellesley Municipal Light Plant pays a flat $8,500 for a whole-home heat pump when you remove or decommission the old fossil system, or $6,500 flat if you keep it as backup. Partial-home heat pumps earn $1,125/ton up to $5,000, and basic replacements earn $500/ton up to $2,500. Weatherization is rebated at 75% of cost up to $3,000 — the highest of the six MA municipals. WMLP also has the strictest account gates: active account for 6+ months, no past-due balance, and no municipal tax liens. Wellesley is not on Mass Save.
Mass Save is funded by the three investor-owned utilities — Eversource, National Grid, and Unitil. Wellesley is served by the Wellesley Municipal Light Plant (WMLP), a municipal light plant, so WMLP customers are outside Mass Save entirely. WMLP's own program — effective January 1, 2026 — is structured around a flat whole-home rebate and a decommissioning bonus rather than the per-ton model Mass Save uses.
| Feature | WMLP Program | Mass Save (IOU customers) |
|---|---|---|
| Who runs it | WMLP + Abode Energy Mgmt | Eversource / National Grid / Unitil |
| Whole-home rebate | $8,500 flat (with removal) | $2,650/ton, cap $8,500 |
| Incentive structure | Flat + decommissioning bonus | Per-ton, capped |
| System-retained option | $6,500 flat | Not differentiated |
| Weatherization | 75% of cost, up to $3,000 | 75–100% of cost |
| Account gates | 6-mo tenure + no past-due + no tax liens | No tenure / lien requirement |
Reading the comparison. Mass Save's $2,650/ton (up to $8,500) whole-home figure is the IOU standard and is shown only for comparison — Wellesley homeowners cannot claim it. WMLP reaches the same $8,500 ceiling but as a flat amount tied to removing the fossil system, which rewards full electrification rather than system size.
WMLP is the only Massachusetts municipal that ties its top incentive to retiring the old system. The two whole-home tiers are otherwise identical — same sizing, same equipment rules — so the choice is purely about what happens to your furnace or boiler.
$8,500
Remove or decommission the fossil system
Your home goes fully electric. WMLP pays the maximum flat rebate. Best for homeowners committed to leaving oil, propane, or gas behind entirely.
$6,500
Keep the system as backup / hot water
The heat pump still serves the whole home, but you retain the existing system for backup or domestic hot water. You forgo the $2,000 decommissioning premium.
Whole-home tiers are flat amounts; partial and basic tiers are per-ton. Each account can claim one whole-home rebate or up to two partial/basic rebates (lifetime partial cap $6,500).
The top tier. A flat $8,500 when the heat pump serves the whole home and the existing fossil-fuel system is removed or decommissioned. WMLP is the only Massachusetts municipal that ties its highest incentive to actually retiring the old system — not just installing the heat pump.
Decommissioning bonus
A flat $6,500 when the heat pump serves the whole home but you keep the existing system as backup or for domestic hot water. Same sizing and equipment rules; you forgo the $2,000 decommissioning premium.
Backup / hot water allowed
For a heat pump covering less than 90% of the heat load. Per-ton, not flat. Useful when you electrify part of the home or add zones without going whole-home.
Cap $5,000
New for 2026. Like-for-like heat-pump replacement, or an addition under 500 square feet. The entry tier for smaller or single-zone projects.
Cap $2,500
Complete air sealing and insulation within 6 months of a whole-home heat-pump install and WMLP rebates three-quarters of the cost. Doing it first shrinks your heating load so the system can be sized smaller, and it sharply improves comfort on the coldest nights.
Federal 25C tax credit: EXPIRED. Section 25C ended December 31, 2025. There is $0 in federal heat-pump tax credit in 2026. The WMLP rebates above are current and available now.
Remove or retain? Get the math for your home.
We'll model the $8,500 decommissioning tier against the $6,500 retained tier for your house — including the 75% weatherization rebate — before you apply.
WMLP applies tighter eligibility rules than any other Massachusetts municipal heat-pump program. Confirm all of these before you plan the project — the tax-lien clause in particular trips up homeowners who assume utility programs only check account standing.
WMLP account active and in good standing for at least 6 months.
Your account must carry no outstanding past-due balance.
No municipal tax liens on the property — the strictest eligibility gate of any MA municipal heat-pump program.
Homes built before 2013 need an energy assessment within the prior 3 years.
The order matters: whole-home rebates must be applied for before installation.
Your WMLP account must be active and in good standing for at least 6 months, with no past-due balance and no municipal tax liens on the property. WMLP customers are not eligible for Mass Save heat-pump rebates — this program replaces it.
If your home was built before 2013, you need a qualifying energy assessment within the prior three years. This also opens the door to WMLP's 75%-of-cost weatherization rebate (up to $3,000), the highest coverage of the six MA municipals.
For the $8,500 / $6,500 whole-home tiers you must apply before installation through Abode Energy Management, WMLP's administrator. Decide now whether you'll remove the fossil system (for the full $8,500) or retain it as backup ($6,500). Partial and basic tiers apply within 6 months after install instead.
NuWatt sizes the whole-home system to 90–120% of your Manual J load and installs NEEP cold-climate equipment with an active AHRI certificate. If you're claiming the $8,500 tier, we remove or decommission the old fossil system as part of the job.
Whole-home projects get a quality-assurance inspection within 12 months. Once it clears, your rebate is issued. Each account can claim one whole-home rebate OR up to two partial/basic rebates (lifetime partial cap $6,500).
Wellesley Municipal Light Plant pays a flat $8,500 for a whole-home heat pump when you remove or decommission the existing fossil-fuel system, or a flat $6,500 if you keep the old system as backup or for hot water. A partial-home heat pump (covering less than 90% of the heat load) earns $1,125 per ton up to $5,000, and a basic like-for-like replacement or small addition earns $500 per ton up to $2,500. Weatherization is rebated at 75% of cost up to $3,000 — the highest coverage of any Massachusetts municipal utility. The program took effect January 1, 2026.
NuWatt confirms your account eligibility, applies before installation, sizes a NEEP cold-climate system to 90–120% of your load, and decommissions the old fossil system so Wellesley homeowners capture the full flat rebate.
