Maine Energy Tax Incentives: Rebates, Loans, and Credits

Maine energy tax incentives in 2026 center on state programs: Efficiency Maine rebates for heat pumps and weatherization, low-interest energy loans, property tax exemptions for solar and wind equipment, and net energy billing credits on your utility bill. The federal residential energy tax credits that paid 30% of solar and heat pump projects were terminated for anything installed after December 31, 2025 under the One Big Beautiful Bill Act, so state-level help is now the main way to bring down the cost of an energy upgrade.¹

Heat Pump Rebates From Efficiency Maine

Heat pumps carry the largest rebates. The amount depends on household income, and every homeowner qualifies for at least the base tier.

Any income: $1,000 per qualifying outdoor unit, up to a $3,000 lifetime limit per housing unit.
Moderate income: $2,000 per qualifying outdoor unit, up to a $6,000 lifetime limit. Adjusted gross income must be $70,000 or less for individual filers, or $100,000 or less for joint filers.
Low income: $3,000 per qualifying outdoor unit, up to a $9,000 lifetime limit. You qualify if anyone in your household participates in MaineCare, HEAP, SNAP, or TANF.

Several conditions decide whether a project actually qualifies. The heat pump system has to be sized to handle at least 80% of your home’s peak heating load, and together with any backup heat it must reach 100%. Your existing fossil fuel system has to be shut off or kept only for emergencies. Low- and moderate-income applicants must install the equipment in their principal residence. The housing unit cannot have had a natural gas utility account before the upgrade. Work must be done by an Efficiency Maine Residential Registered Vendor, and you have six months after the project is complete to submit the rebate claim form.²

Insulation and Air Sealing Rebates

Weatherization rebates follow the same income tiers:

Any income: 40% of project cost, up to $4,000.
Moderate income: 60% of project cost, up to $6,000.
Low income: 80% of project cost, up to $8,000.

Eligible work covers attic, wall, and basement insulation along with air sealing in spaces heated through the winter. Windows do not count. The building has to be an existing home, not new construction, and the installer must be an Efficiency Maine Residential Registered Vendor. Health and safety work such as mold or radon mitigation can be included but is capped at 25% of total project cost. Low-income participants pay only the difference between the total cost and the rebate; other tiers pay in full and are reimbursed after the project.³

Low-Interest Home Energy Loans

Efficiency Maine lends up to $25,000 at fixed rates to cover whatever remains after rebates. The loan amount cannot exceed your net project cost after anticipated rebates are subtracted.

1-year term: 0% APR with a $500 origination fee.
5-year term: 5.99% APR, no origination fee.
10-year term: 7.99% APR, no origination fee.
Income-based 10-year term: 5.99% APR, capped at $7,500, no origination fee, with easier credit requirements.

Standard loans require a minimum FICO score of 620 and a debt-to-income ratio of 55% or less. The income-based option drops the credit floor to 580 and allows a debt-to-income ratio up to 70%. Eligible projects include heat pumps, insulation and air sealing, and health and safety work needed to complete the upgrade.⁴

Property Tax Exemption for Solar and Wind Equipment

Maine exempts solar and wind energy equipment from property tax, so installing a system does not push up your assessed value or your annual tax bill. Under Title 36, §655, personal property used to generate solar or wind energy is exempt when the energy is used on-site or sent through a utility with the customer receiving bill credits.⁵ Title 36, §656 covers the parallel exemption for real estate: solar and wind equipment attached to buildings or land.⁶

For property tax years beginning April 1, 2025 and later, the solar exemption was broadened to include equipment collocated with net energy billing customers subscribed to at least 50% of a facility’s output, and generators that signed an interconnection agreement with a utility before June 1, 2024. That reaches certain community solar arrangements that earlier wording did not.⁵

To claim the exemption, file the state-prescribed report with your local municipal assessor on or before April 1 of the first property tax year you want it to apply. File once, and the exemption carries forward automatically. Miss the April 1 deadline and the exemption shifts to the following tax year.

Net Energy Billing Credits

Net energy billing lets homeowners with solar panels or other small renewable generators offset their electricity bills with kilowatt-hour credits. Excess generation in a billing period becomes a credit on your bill. You can generate from panels on your own roof or by subscribing to a share of a larger community solar project within your utility’s service territory.⁷

Projects must be renewable generators under 5 megawatts. Unused credits expire after 12 months, so oversizing a system well beyond your yearly consumption will not bank credits indefinitely. Companies marketing community solar subscriptions to residential customers must be registered with Maine’s Public Utilities Commission and must provide a disclosure form showing the costs and expected benefits.

Federal Credits Only Apply to 2025 Installations

Both federal residential credits ended for property placed in service after December 31, 2025. The IRS treats an expenditure as made when installation is completed, so the signing date or the payment date does not control. Solar panels energized in November 2025 qualify; the same panels first running in January 2026 do not.¹

If you completed qualifying work during 2025, the credits are still available on your 2025 return filed in 2026. The Residential Clean Energy Credit covered 30% of costs for solar electric systems, solar water heaters, and battery storage with no dollar cap, except for fuel cells, and any unused portion can be carried forward to future tax years.⁸ The Energy Efficient Home Improvement Credit covered 30% of costs for heat pumps, biomass stoves, windows, doors, and insulation, with annual caps of $2,000 for heat pumps and biomass equipment and $1,200 for most other improvements, including sub-limits of $600 for windows and $250 per exterior door. This credit cannot be carried forward; any amount above your tax liability is lost.⁹

Both credits are claimed on IRS Form 5695, attached to Form 1040.¹⁰ Keep the manufacturer’s certification statement showing the equipment meets federal efficiency standards, itemized receipts for labor and materials, and documentation of the installation date. For any project installed in 2026 or later, no federal residential energy credit is available, which is why the state rebates, loans, exemptions, and billing credits above now carry the full weight of reducing project costs.

How to Claim Each Incentive

Efficiency Maine rebates do not go through your tax return. Hire a Registered Vendor, complete the project, and submit the rebate claim form within six months of completion. Income-eligible applicants should verify their status through Efficiency Maine before or during the project, and keep every invoice along with the vendor’s documentation of equipment models and installation details.

For the property tax exemption, file the state-prescribed form with your local municipal assessor by April 1 of the first tax year you want it to apply. The assessor reviews whether the equipment meets the statutory definitions before excluding its value from your assessment.⁵

For a 2025 federal credit, assemble the certification statement, itemized receipts, and installation date, then file Form 5695 with your 2025 return. Hold onto digital copies of everything you submit and of the IRS acknowledgment of your e-filed return.

1
Internal Revenue Service. FAQs for Modification of Sections 25C, 25D, 25E, 30C, 30D, 45L, 45W, and 179D Under Public Law 119-21
2
Efficiency Maine. Residential Heat Pump Rebates
3
Efficiency Maine. Insulation Rebates up to $8,000
4
Efficiency Maine. Home Energy Loans
5
Maine Legislature. Maine Code 36 – Personal Property
6
Maine State Legislature. Maine Code 36 – Real Estate
7
Maine Public Utilities Commission. Net Energy Billing
8
Internal Revenue Service. Residential Clean Energy Credit
9
Internal Revenue Service. Energy Efficient Home Improvement Credit
10
Internal Revenue Service. Instructions for Form 5695