The seasonal swing is larger here than most places
Maine sits far enough north that daylight hours vary substantially across the year, and winter brings both low sun angles and snow cover on panels. Summer production can be several times winter production.
Household consumption often moves the other way, particularly for homes with electric heating or a heat pump, where the heaviest demand falls in exactly the months when the array produces least.
That is not a reason against solar in Maine; it is the reason the credit mechanism matters so much. One-to-one credit at the retail rate, carried across a rolling twelve months, is what bridges the gap.
It does mean an annual total conceals more here than in a milder state. Ask for the production estimate month by month rather than as a single figure.
How the rolling window handles it
Under Public Utilities Commission Chapter 313, unused kilowatt hour credits are applied against usage over a rolling 12-month period, and at the end of each rolling 12 months any accumulated unused credit is eliminated with no payment.
For a Maine profile that structure works well. Credit built in June and July is drawn down through the following heating season, comfortably within the twelve month window.
What it does not accommodate is a system producing more across a full year than the household uses. That surplus is eliminated rather than banked or paid out.
So ask for the monthly profile with the credit balance tracked across a full year. A balance that rises through summer and returns toward zero by spring describes a well-sized system. A balance that only climbs describes one that is too large.
Design choices that suit a Maine winter
Ask what snow allowance the production model applied and how it was derived. Snow cover is a genuine loss and its size depends on tilt, orientation and how readily the array sheds.
Ask about tilt specifically. A steeper tilt sheds snow more readily and shifts output toward the shoulder seasons, which in Maine is often a better trade than maximising a summer peak that will largely be exported.
Ask how the array is mounted and whether snow shedding creates any issue below it, such as over a walkway or an entrance. That is a practical detail rather than an economic one, and it is easier to solve at design stage.
And ask whether a heat pump is in your plans. It is the most common reason a Maine household legitimately sizes ahead, because it genuinely raises winter consumption, which is precisely when a Maine array produces least.
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 in Augusta 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 elimination, and the property tax exemption under 36 M.R.S. Section 655 with its April 1 application deadline.
Ask for a monthly production and consumption profile with the credit balance tracked, a stated snow allowance, and the tilt decision explained. In a state with this seasonal swing, an annual figure alone is not enough to judge a design.