Mass Save (Eversource & National Grid)
Mass Save Insulation Rebates is available to homeowners and renters in Plymouth, MA.
Covers 75% of insulation costs for all customers, or 100% for income-eligible households. Includes attic, wall, and basement insulation plus air sealing. Free home energy assessment required before installation.
Typical insulation project value with 75% rebate coverage
Official program page checked live on 2026-06-22.
Data last verified 2026-06-09. How we verify our data.
In Plymouth, MA, you can combine this program with other local help to cut your cost:
A grant-savvy contractor in Plymouth, MA can handle the paperwork, inspections, and timelines so your funding releases on schedule. Getting matched is free.
You will likely need a contractor to apply
Projects like this almost always need a licensed contractor, and many grants ask for a written estimate as part of your application. Lining up a contractor in Plymouth early keeps your application moving.
Get matched with a contractorEach program sets its own contractor rules. Check the official program page for exact requirements.
Mass Save offers this rebate to its residential customers who install the qualifying energy-efficient equipment this program covers. You apply through the utility's rebate program, usually online with your account, your paid invoice, and the equipment's model or efficiency rating. Many rebates are submitted by a participating contractor and paid after the equipment is installed, so confirm the current rebate and rules on the official page first.
Steps to apply
Documents you will likely need
Requirements vary by program and locality. Confirm the exact rules on the official program page. We can help you prepare your paperwork, but you submit it yourself.
Deadline: Rolling applications year-round
Ask us. It is free, and a real person answers within a business day.
Email us about this program75-100% of insulation costs.
Mass Save Insulation Rebates is open to homeowners and renters in Plymouth, MA. It has no income limit.
Apply directly with Mass Save (Eversource & National Grid) using the official program link on this page or call (866) 527-7283. There is no middleman and no fee.
Grant-approved contractors understand the documentation, inspections, and timelines, so your funding releases on schedule.
Rebates and discounts that stack on top of any grant. Most are free to use.
This is just one of many grants, rebates, and free programs available. Stack them together to maximize your savings.
See All Programs