In Maine the utility on your bill does more to set the payback than the roof does. Every kWh you send to the grid cancels a kWh you buy later, so each one is worth your utility’s full price per kWh. In our example a typical owned system pays back in about 10 years with Central Maine Power and about 8 with Versant’s Bangor Hydro District.
Typical payback, Central Maine PowerAbout 10 years
CMP or Versant Bangor HydroAbout 8 to 10 years
Typical owned 8.89 kW Maine system at $27,115 cash (EcoGen Solar Cost Index, September 2026) at CMP’s 24.68 cents per kWh; about 8 years at Versant Bangor Hydro’s 30.35 cents. Our assumptions: 40% of the solar power used at home as it is made, every credit used, $267 a year in owner costs. See the math.
- Utility: CMP at 24.68 cents per kWh, Versant at 29.66 cents to 30.35 cents. Town-owned utilities can be far lower.
- Size: match a year of your use. Credits left after 12 months expire unpaid.
- Time in home: about 8 to 10 years to pay back at the typical price.
2026 rules: new home systems get no 30% federal homeowner credit (IRS). Home systems on your side of the meter still earn one kWh credit for each kWh exported; only projects on the utility side lost new agreements after December 31, 2025.
How we checked this guide
Utility prices and fixed charges come from the Maine Public Utilities Commission (PUC) rate table, credit rules from the PUC’s net energy billing rule, tax rules from Maine Revenue Services and state law, and battery payments from Efficiency Maine. The example system is the EcoGen Solar Cost Index typical Maine home. Where we had to assume a number, the page says so.
The writer and checker shown above are EcoGen staff. EcoGen is paid when homeowners request quotes, which is explained beside the quote form. Read our editorial standards.
What makes a Maine roof pay, and what holds it back
Maine pays nothing toward the panels: no rebate, no state tax credit, and no federal credit in 2026. What it gives you is a fair trade on the bill. Each kWh (kilowatt-hour, the unit your bill counts) sent to the grid earns a credit that cancels a kWh you buy later. So the answer comes down to what your utility charges per kWh. Read each row across.
Your utility
Worth a closer look
Versant bills you, at 30.35 cents (Bangor Hydro) or 29.66 cents (Maine Public) per kWh.
Pause and check
A town-owned utility bills you at a much lower price, such as Kennebunk Light & Power at 16.50¢.
Check next: the utility on your bill and the per-kWh price the quote used.
System size
Worth a closer look
The panels make about what your home uses in a year, plus a planned heat pump or EV.
Pause and check
The design makes more than you use. Extra credits expire after 12 months unpaid.
Check next: a year of bills next to the quote’s year-one kWh.
The fixed charge
Worth a closer look
You expect a smaller bill, with the monthly fixed charge still on it.
Pause and check
The quote promises a $0 bill. CMP’s $27.37 a month fixed charge stays, and it already covers the first 50 kWh each month.
Check next: the remaining monthly bill the quote assumes after solar.
Roof, shade and snow
Worth a closer look
A sound, unshaded roof steep enough to shed snow.
Pause and check
A roof that needs replacing within a few years, or trees that shade it.
Check next: the roof’s age, a shade report and month-by-month output.
Price and time in home
Worth a closer look
A cash price near the Index’s $27,115 for 8.89 kW ($3.05 per watt), and a plan to stay 10 years or more.
Pause and check
A quote that still subtracts a 30% federal credit, a dealer fee in the loan, or a likely move.
Check next: the cash price beside the financed total, with every fee shown.
One system, two Maine utilities
Simple payback is the years your savings take to cover what you paid: net cost divided by yearly savings. Start with Central Maine Power, which carries 78.6% of the state’s home electricity use. CMP charges 24.68 cents for each kWh above the first 50 each month, so that is what each solar kWh saves.
- Cash price
- $27,115
- Confirmed incentives
- $0
- Year-one production
- 12,173 kWh
- Used at home / exported
- 40% / 60%
- CMP price per kWh (PUC, July 2026)
- $0.2468/kWh
- Export credit
- $0.2468/kWh
- Owner-cost allowance
- $267/yr
- Used-at-home value
12,173 × 40% × $0.2468$1,202/yr - Export value
12,173 × 60% × $0.2468$1,803/yr - Yearly savings after owner costs
$1,202 + $1,803 − $267$2,738/yr - Simple cash payback
$27,115 ÷ $2,738about 9.9 years
Inputs: the EcoGen Solar Cost Index typical Maine system (8.89 kW, $27,115 cash, September 2026; about 1,369 kWh per kW a year) and CMP’s 24.68 cents per kWh (PUC, July 1, 2026). Our assumptions: 40% of the solar power used at home as it is made and 60% sent to the grid, and $267 a year in owner costs ($30 per kW, including a reserve for a new inverter). With one-for-one credits the split does not move the result if every credit is used. The cost page’s about 7.6 years uses the 29.31¢ EIA average and no owner costs.
Now move the same system to Versant Power’s Bangor Hydro District (13.5% of home use), where each kWh costs 30.35 cents. Price, panels and output stay the same. Only the value of each kWh goes up.
| Scenario | Price per kWh | Savings before costs | Yearly savings | Simple payback |
|---|---|---|---|---|
| Central Maine Power | $0.2468 | $3,004 | $2,738 | about 9.9 years |
| Versant, Bangor Hydro | $0.3035 | $3,695 | $3,428 | about 7.9 years |
Versant’s Maine Public District, at 29.66 cents, lands close to Bangor Hydro. The 29.31¢ federal statewide average blends every utility and spreads fixed charges over every kWh, so use your own utility’s price instead.
Both cases assume every credit gets used within 12 months. Rates are from the PUC table as of July 1, 2026 and change when supply prices reset.
Run your own Maine numbers
The tool starts with the CMP case above. Enter your own quote and press Calculate. For Versant or a town utility, put its price per kWh in both rate boxes. Nothing you enter is sent anywhere.
Example result
about 9.9 years
simple cash payback
- Used-at-home value
- $1,202/yr
- Export value
- $1,803/yr
- Owner costs
- −$267/yr
- Yearly savings
- $2,738/yr
- Net cost
- $27,115
Starts with the CMP case above. For Versant, put your district’s price per kWh in both rate boxes. Flat first-year values; rates, panel wear and repairs will change the result.
How Maine’s kWh credits can work against an oversized system
The export credit is what you get for power your panels send to the grid. In Maine it is a kWh, not a dollar amount, so its value moves with your utility’s price. The catch is time: a credit can be used for 12 months, then it expires unpaid, and it can never be cashed out.
The typical system in the Cost Index is 8.89 kW, which makes about 12,173 kWh a year. Put that next to your last 12 months of bills. If your yearly use is well below the quote’s output, part of each summer’s credits will expire and payback gets longer. A system that matches your bills often pays back sooner than a bigger one.
The fixed charge sets a floor too. CMP’s $27.37 a month covers the first 50 kWh each month, and Versant Bangor Hydro’s $22.41 a month covers the first 100. Credits do not remove that charge, so plan on a smaller bill, not a free one.
Town-owned utilities and co-ops apply the same rule with their own limits, up to 100 kW unless the utility allows more. Their prices differ widely: Kennebunk Light & Power charges 16.50¢ per kWh, about two-thirds of CMP’s, so the same system takes far longer to pay back there.
Get quotes priced at your utility’s rate
CMP, Versant or a town utility changes the answer by years. Ask each installer which rate they used, and to size the system from your own bills.
Solar providers that serve your area may contact you, and they pay EcoGen for the introduction. How we make money.
Tax rules and battery money that sit beside the payback
Property tax. Qualifying home solar can be exempt from property tax, but only if you file the application with your town assessor on or before April 1 of the first year you claim it. The exemption keeps your tax bill from rising; it does not lower the system price, so the example counts nothing for it.
Sales tax. Maine’s 5.5% sales tax applies to solar equipment; the old exemption was repealed in 1985.
Batteries. A battery does not shorten solar payback here, because kWh credits already bank your surplus. Its value is backup power plus battery sharing payments: makers on Efficiency Maine’s list pay $126 to $180 a year per average kW shared during events, which last 3 hours, usually on weekday evenings.
Six lines to find on a Maine solar quote
Get two or three quotes. Without these lines, a quote’s payback cannot be checked.
- Utility and rate. Your utility’s name and the per-kWh price the savings use. CMP is 24.68 cents; Versant is 29.66 cents to 30.35 cents.
- Size against your use. Year-one kWh next to 12 months of bills, plus any heat pump or EV you plan.
- The bill after solar. The fixed charge that stays ($27.37 a month at CMP, $22.41 a month at Versant Bangor Hydro).
- Full cash price. The total with Maine’s 5.5% sales tax, permits and interconnection included.
- No federal credit. A 2026 owned-system quote should not subtract the expired 30% homeowner credit.
- Property tax form. Who files the exemption application with your town assessor by April 1.
Compare Maine solar quotes
Ask each installer to show the per-kWh rate they used and the size they chose from your bills. Enter your ZIP code to request quotes from solar providers that serve your area.
How EcoGen is paid
EcoGen America does not sell or install solar. When you request quotes, we pass your request to solar providers serving your area, and they pay us for the introduction. Providers can include installers, solar marketplaces and lead exchanges, and more than one may contact you. You never pay us.
More Maine solar guides
- Maine solar incentives: kWh credits, property tax and battery payments
- What solar costs in Maine
- Free solar panels in Maine: what $0 down really means
- Are solar panels worth it? The national guide and payback calculator
All 51 state guides
Maine solar questions
Are solar panels worth it in Maine without the federal tax credit?
They can be. The homeowner credit does not apply to systems installed after December 31, 2025, and Maine has no panel rebate. The price per kWh carries the payback: about 10 years for a typical owned system with CMP in our example, about 8 with Versant Bangor Hydro.
Is solar better in Versant territory than CMP territory?
On payback, yes. Versant’s per-kWh prices are 29.66 cents (Maine Public) and 30.35 cents (Bangor Hydro), against 24.68 cents at CMP, from the PUC table as of July 1, 2026. The same system saves more each year with Versant. A cheaper quote in CMP territory can still beat a pricier one with Versant.
What does solar cost in Maine in 2026?
The typical Maine system in the September 2026 Cost Index is 8.89 kW at $27,115 cash, or $3.05 per watt, before financing. That is also the net price for an owned system, since no federal credit or state rebate applies. Your size should follow your own use, not the typical figure.
How much can solar lower a Maine electric bill?
The typical system makes about 12,173 kWh a year. At CMP’s price that power is worth about $3,004 in year one, and about $3,695 at Versant Bangor Hydro, if all of it replaces power you would buy. The fixed monthly charge stays, so the bill does not reach zero.
Does Maine still have one-for-one net metering?
Yes, for systems on your side of the meter. Each kWh sent to the grid earns a kWh credit against later use. Credits cannot be cashed out and expire after 12 months. Only projects on the utility side of the meter lost new agreements after December 31, 2025.
Do solar panels work through Maine winters?
Yes, but they make much less in winter than in summer, and snow can cover the panels for a while. Maine’s credits help: summer surplus rolls forward for up to 12 months, so it can cover winter use. Ask for month-by-month output and the snow loss assumed.
Is a home battery worth it in Maine?
Not for solar payback, because kWh credits already store your surplus on the grid. A battery’s value is backup power plus battery sharing payments of $126 to $180 per average kW a year through Efficiency Maine. Its own example puts a 15 kWh battery at about $5,000 over 10 years.
Sources, method and corrections
The example uses the EcoGen Solar Cost Index typical Maine system (September 2026) and each utility’s per-kWh price from the Maine PUC rate table. Because Maine credits exports one kWh for one kWh, an export that gets used is valued at that full price. Our assumptions, not measured values: 40% of the solar power used at home as it is made and 60% sent to the grid, every credit used within 12 months, and $267 a year in owner costs ($30 per kW, including a reserve for a new inverter). Simple payback uses flat first-year values. The calculator runs in your browser and sends nothing.
Spotted an error? Tell us through our corrections and feedback process.
- Maine PUC: residential electricity rates in Maine (table as of July 1, 2026; per-kWh prices, fixed charges and load shares; checked October 5, 2026)
- Maine PUC Chapter 313: net energy billing rule (kWh credits, 12-month expiry, contract terms)
- Maine Revenue Services: Bulletin No. 29, solar property tax exemption (April 1 filing deadline)
- Maine statute 36 M.R.S. 1811: sales tax rate (5.5% general rate)
- Efficiency Maine: small battery incentives (battery sharing events and example)
- Efficiency Maine: participating battery makers (payments per average kW)
- IRS: Residential Clean Energy Credit (not available for property installed after December 31, 2025)
- U.S. EIA: average residential electricity price by state (12-month average, August 2025 to July 2026, as used in the Cost Index)
- EcoGen Solar Cost Index, September 2026: what solar costs in Maine (typical system size, price and yearly output)
