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Solar incentives · Maine · 2026
Solar rebates in Maine.
The federal, state, and utility solar incentives available in Maine for 2026, then matched to a vetted local installer.
Programs · Maine
6
active programs & rules in 2026
Net Energy Billing, one-to-one retail credit, rolling 12-month reset · verified 2026-09-01
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The full list
6 programs available right now in Maine.
Tax credit
#01
Federal Residential Clean Energy Credit (Section 25D) - ENDED
The 30 percent federal Residential Clean Energy Credit under Section 25D expired for property placed in service after December 31, 2025. Cash and loan purchases made now receive no federal tax credit, and Maine has no state solar tax credit to fall back on. A quote that still applies it is overstating your return by roughly a third.
Source ↗ Tax credit
#02
Federal Commercial ITC (Section 48E) - via Lease / PPA
Section 48E, the commercial Clean Electricity Investment Credit, survives at 30 percent and is available to third-party owners of residential systems under leases and power purchase agreements. The provider claims it and may reflect part of the value in the rate offered. Ask what they claim and what actually reaches you, and confirm with a tax advisor.
Source ↗ Net metering
#03
Net Energy Billing - one-to-one retail rate credit
Maine Net Energy Billing, governed by Public Utilities Commission Chapter 313, gives residential rooftop customers a kilowatt hour credit for excess generation, applied against usage at the retail rate. Against a Maine residential average around 30.4 cents per kWh that is among the most valuable net metering arrangements remaining in the United States. LD 1777 changed compensation for community solar to a tariff basis but did not alter residential rooftop net energy billing.
Source ↗ Program
#04
Rolling 12-month credit elimination
Unused kilowatt hour credits do not accumulate indefinitely. Customers apply credits against usage over a rolling 12-month period, and at the end of each rolling 12-month period any accumulated unused kilowatt hour credit is eliminated and may not be applied against future usage. There is no payout for eliminated credit. A system that generates more than the household consumes across a year therefore loses the difference rather than banking it.
Tax credit
#05
Renewable Energy Equipment Property Tax Exemption (36 M.R.S. Sec. 655)
Solar equipment generating heat or electricity is exempt from local property tax in every Maine municipality where all the energy is used on site, or is transmitted through utility facilities and a utility customer receives a bill credit. Batteries used to store solar-generated electricity, along with panels, racking, inverters, charge controllers and associated wiring, fall within the exemption. It is not automatic: a completed application must be filed with the assessor of the municipality where the equipment is located on or before April 1 of the first year the exemption is claimed. Missing that date is the common way this is lost.
Source ↗ Program
#06
No Maine solar rebate or state tax credit
Maine has no state solar tax credit and no state solar rebate. Efficiency Maine, which many homeowners associate with energy incentives here, runs rebates for heat pumps and other efficiency measures rather than for solar panels. It does operate a Small Battery Incentive Program, which pays battery owners for participating in demand response events on the New England grid, typically 40 to 60 times between June 1 and September 30.
Net metering · Maine
Net Energy Billing, one-to-one retail credit, rolling 12-month reset
Maine Net Energy Billing under Public Utilities Commission Chapter 313 credits residential rooftop generation against household usage at the retail rate, one for one. Against a Maine residential average around 30.4 cents per kWh, roughly two-thirds above the national figure, that makes each exported kilowatt hour unusually valuable and it is the main reason Maine solar works despite a northern climate and a high installed cost. The constraint to design around is the reset. Customers accumulate unused kilowatt hour credits and apply them against usage over a rolling 12-month period, and at the end of each rolling 12-month period any accumulated unused credit is eliminated and may not be applied against future usage. Nothing is paid for eliminated credit. A rolling window behaves differently from a fixed annual true-up date: rather than one settlement day in the calendar, credit generated in a given month has twelve months to be used before it lapses. In practice that suits Maine reasonably well, since a summer surplus is drawn down through a long heating season within the window. But it still means a system generating more than the household consumes across a year gives the difference away, so the design should start from your last twelve months of bills rather than from available roof area. Central Maine Power and Versant Power serve different parts of the state at different retail rates, so confirm which one bills you before accepting any figure in a quote.
Worth checking before you sign:
taking a rebate can change your net-metering terms, and export credit rules
differ by utility. Your matched installer confirms the exact numbers for
your address.
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