Maine Solar Incentives & Rebates Guide 2026

The federal Investment Tax Credit (ITC) allows Maine homeowners to deduct 30% of the total cost of a solar energy system from their federal income taxes. For a typical 6kW system costing $17,280 in Maine, that's a direct tax credit of $5,184. This isn't a deduction — it's a dollar-for-dollar reduction of your tax bill.

The 30% ITC is available through 2032 under the Inflation Reduction Act, then steps down to 26% in 2033 and 22% in 2034. There's no maximum cap on the residential credit. If your tax liability is less than the credit amount, you can roll the remaining credit forward to the next tax year. The system must be installed on your primary or secondary residence, and you must own it (leased systems don't qualify for the homeowner credit).

Maine does not currently offer a state-level solar tax credit. However, Maine homeowners still benefit from the substantial 30% federal ITC, worth $5,184 on a typical 6kW system. Even without a state credit, solar is economically attractive in Maine with electricity rates averaging 27.78¢/kWh — well above the national average.

Great news for Maine homeowners: Solar energy systems are exempt from property tax assessments. 100% exemption; must apply with local assessor by April 1 Studies show solar adds 3-4% to home values. For a $300,000 home, that's roughly $12,000 in added value — and with Maine's property tax exemption, you save approximately $132 per year in property taxes you'd otherwise owe on that increased value.

Maine exempts solar energy equipment from state sales tax. On a 6kW system costing $17,280, this saves you approximately $1,123 at the point of purchase. This is an immediate, upfront savings that reduces your out-of-pocket cost before even accounting for tax credits.

Net metering policy: Full Retail Rate. Net energy billing at retail rate The current system size cap is 25 kW.

Maine's full retail rate net metering is one of the strongest solar policies available. Every excess kWh your system sends to the grid earns you a credit at the full retail rate of 27.78¢/kWh. This means your solar panels generate maximum value — surplus energy produced during sunny hours offsets your evening and nighttime consumption at the same rate you'd pay to buy that electricity.

Maine has a mandatory Renewable Portfolio Standard (RPS) target of 80% by 2030, 100% by 2050. This legally binding target drives continued investment in renewable energy infrastructure and often supports solar-friendly policies like net metering and SREC programs. A strong RPS is generally good news for solar homeowners, as it creates market demand for renewable energy and helps maintain favorable solar policies.