A worked example: 8 kW in Maine
An 8 kW system — about 19 × 425-watt panels — at Maine's assumed installed cost of $2.80–$3.60 per watt runs roughly $22,400–$28,800 before incentives. At about 1,190 kWh of production per installed kW, it would generate around 9,520 kWh per year. Valuing self-consumed electricity at the assumed $0.27/kWh retail rate and exports conservatively, first-year savings land near $2,118 — a simple payback of roughly 11–14 years.
There is no federal tax credit in that math: the Section 25D residential credit ended for systems installed after December 31, 2025. State or utility incentives, where they exist, would shorten payback from here.
Average cost of solar panels in Maine by system size
Most Maine quotes land between 6 and 12 kW. At the state's assumed $2.80–$3.60 per watt, here is what each size costs to install, what it produces, and how long it takes to pay for itself on electricity savings alone — no incentives applied.
| System size | Panels | Installed cost | Annual production | Est. payback |
|---|---|---|---|---|
| 6 kW | 15 | $16,800–$21,600 | 7,140 kWh | 11–14 yrs |
| 8 kW | 19 | $22,400–$28,800 | 9,520 kWh | 11–14 yrs |
| 10 kW | 24 | $28,000–$36,000 | 11,900 kWh | 11–14 yrs |
| 12 kW | 29 | $33,600–$43,200 | 14,280 kWh | 11–14 yrs |
Size should follow your electricity usage, not a round number — these are reference points, not a recommendation. Note that cost per watt rises on smaller systems, because permitting, labor and the inverter do not shrink with the array.
What solar costs per kWh in Maine
Spread across a 25-year life, with 0.5%/yr panel degradation and no financing cost, solar electricity in Maine works out to roughly 10.0¢–12.8¢ per kilowatt-hour. The Maine retail rate this page assumes is 27.0¢. That gap — not the sticker price — is what determines whether solar pays here, and it is why a sunnier state with cheap electricity can be a worse investment than a cloudier one with expensive electricity. See how every state compares on cost per kWh.
Net metering and export rates in Maine
Maine’s net energy billing credits exports at close to retail value with 12-month rollover, one of the stronger policies in New England. Program details have been debated legislatively — confirm current terms.
Export rules are worth reading as an incentive, because they set what every kilowatt-hour you do not use on site is worth — see how Maine compares with every other state on net metering.
Maine solar incentives
Maine relies mainly on net energy billing rather than rebates; Efficiency Maine periodically offers related programs (notably for heat pumps and storage).
The most valuable program is net energy billing (near-retail export credit). With no federal credit for 2026 installs, state and utility programs are now the whole picture — see the full Maine incentives guide.
What changes a Maine solar quote?
Equipment, roof condition, electrical upgrades, permitting, labor, system size, batteries and financing can all change the installed price. Savings also depend on the specific utility rate, how much solar electricity the home uses directly, and what the utility pays for exports.
Frequently asked questions
What is the average cost of solar panels in Maine?
The average installed cost in Maine runs $2.80–$3.60 per watt before incentives, which puts a 6 kW system at $16,800–$21,600, an 8 kW at $22,400–$28,800, and a 10 kW at $28,000–$36,000. Spread over a 25-year life, that works out to about 10.0¢–12.8¢ per kilowatt-hour, against a Maine retail rate assumed at 27.0¢.
How much does it cost to install solar panels in Maine?
Installation is not priced separately — the $2.80–$3.60 per watt above is a turnkey figure covering panels, inverter, racking, labor, permitting and interconnection. What moves it most in ME is roof complexity, whether the main panel needs upgrading, and whether a battery is included. Expect a site visit to change any online estimate, including this one.
How much do solar panels cost in Maine?
Using an assumed installed cost of $2.80–$3.60 per watt, a typical 8 kW home system in Maine costs roughly $22,400–$28,800 before incentives. Smaller and larger systems scale roughly with size, though small systems cost more per watt.
Is solar worth it in Maine?
With Maine electricity around $0.27/kWh and production around 1,190 kWh per installed kW per year, an 8 kW system could save roughly $2,118 in year one, for a simple payback of about 11–14 years with no federal credit. Whether that is "worth it" depends on your rate plan, export compensation, roof, and how long you plan to stay in the home.
How many solar panels do I need in Maine?
It depends on your electricity usage, not your roof. At Maine's assumed 1,190 kWh per installed kW, a 6 kW system (about 15 panels at 425 watts) generates roughly 7,140 kWh a year, and a 10 kW system (about 24 panels) roughly 11,900 kWh. Compare that against your annual kWh from a utility bill — our calculator sizes it from your monthly bill in about a minute.
Does Maine have net metering?
Maine’s net energy billing credits exports at close to retail value with 12-month rollover, one of the stronger policies in New England. Program details have been debated legislatively — confirm current terms.
What solar incentives does Maine offer in 2026?
Maine relies mainly on net energy billing rather than rebates; Efficiency Maine periodically offers related programs (notably for heat pumps and storage). Note that the federal Section 25D residential credit ended for systems installed after December 31, 2025, so state, local and utility programs are now the main incentives for purchased systems.
Is there still a federal solar tax credit in Maine?
No — the 30% federal residential clean energy credit (Section 25D) ended for systems installed after December 31, 2025 under the One Big Beautiful Bill Act. Leased or PPA systems may still benefit indirectly because the system owner can claim the commercial 48E credit through 2027.
Use this as a starting point
This page provides broad state assumptions, not a current market survey or binding quote. Before purchasing, verify applicable incentives, utility rules, installer licensing, warranties and financing terms.
Where these numbers come from
State assumptions are informed by public data and reviewed periodically (September 2026):