ME · Solar

Solar quotes in South Portland, ME.

One real quote from a vetted local South Portland installer, sized to your roof, your bill, and every federal + state rebate you qualify for.

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One vetted local South Portland installer
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7 kW
Average system size: $3.10/W
Average cost (USD): 9 yrs
Average payback: 70+
Local installers

Why solar in South Portland

Maine exempts solar equipment from local property tax, and unlike most such exemptions this one is not automatic. Under 36 M.R.S. Section 655 you must file a completed application with your municipal assessor on or before April 1 of the first year you claim it. Miss that date and you pay property tax on equipment the legislature intended to exempt. It is a single form and it is the most commonly lost money in a Maine solar project.

What the exemption covers

Solar equipment that generates heat or electricity is exempt from property tax in every Maine municipality, where all the energy is used on the site where the property is located, or is transmitted through utility facilities and a utility customer receives a bill credit.

The second condition is what makes an ordinary grid-tied residential array eligible, since it exports through utility facilities and receives net energy billing credit.

The exemption reaches more than panels. Racking, inverters, charge controllers, associated wiring and batteries used to store solar-generated electricity all fall within it.

The assessor determines the value that the eligible equipment contributes to the total just value of the property and designates that contributory value as exempt. So the effect is that adding solar does not raise your assessment.

The April 1 deadline, and why it gets missed

To be eligible, a taxpayer must file a completed application on or before April 1 of the first year for which the exemption is claimed, with the assessor in the municipality where the equipment is located.

That is a real deadline with a real consequence, and it is easy to miss for a mundane reason: a homeowner who has read that Maine exempts solar from property tax may reasonably assume nothing is required of them.

It is also easy to miss because of timing. A system commissioned in, say, October has months before the following April 1, which is exactly the interval in which an administrative task gets forgotten.

So put the date in your calendar the week the system is commissioned, and confirm with your own municipal assessor what form they require and whether they want any supporting documentation from the installer.

What to get from your installer for it

Ask what documentation they will provide for the exemption application, typically an itemised cost breakdown and a description of the installed equipment, and when they will provide it.

Ask whether they routinely remind customers about the April 1 filing. An installer working Maine seriously will mention it without being asked, and one who does not may not be thinking past the commissioning date.

Ask whether the battery, if you are installing one, is being represented as storing solar-generated electricity, since that is what brings it inside the exemption.

And ask your assessor rather than only your installer. The assessor administers the exemption and is the authoritative source on what your municipality requires.

Costing it out under the current tariff

The 30 percent federal Residential Clean Energy Credit under Section 25D expired for property placed in service after December 31, 2025, so a cash or loan purchase receives no federal tax credit, and Maine has no state solar tax credit or rebate.

Section 48E survives at 30 percent for third-party owners under leases and power purchase agreements, so ask what a provider claims and what reaches you in the rate.

What exists is one-to-one Net Energy Billing at the retail rate, subject to the rolling 12-month credit elimination, and the property tax exemption under 36 M.R.S. Section 655 with its April 1 application deadline.

Ask that your savings model shows no property tax increase attributable to the array, and set a calendar reminder for the filing. That is a form, a deadline and several hundred dollars a year.

Incentives & rebates

Net metering: 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.

Related Maine resources

Maine solar incentives & rebates Full breakdown of federal, provincial, and utility programs.

How payback works in Maine

System cost: $21,700
Estimated net cost: $21,700
Estimated payback: ~13.4 years
25-year net savings: ~$18,800

These figures are illustrative; your actual quote reflects your roof, sun exposure, and local utility rates.

Frequently asked questions

Will solar raise my property taxes in Maine?

It should not, but only if you apply. Under 36 M.R.S. Section 655 solar equipment is exempt from local property tax, and the assessor designates the contributory value as exempt once the exemption is granted.

Is the Maine property tax exemption automatic?

No, and this is where it is most often lost. 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.

Does the exemption cover a battery?

Batteries used to store solar-generated electricity fall within it, along with panels, racking, inverters, charge controllers and associated wiring. Ask that the battery is represented on that basis in the application.

What should I get from my installer?

An itemised cost breakdown and a description of the installed equipment for the application, with a commitment on when it will be provided. Then confirm the required form directly with your own municipal assessor.