Solar panels in Maine
Roofs across Maine get about 1,386 hours of usable sunlight a year, and electricity costs 24.8¢/kWh. That combination puts a typical system's payback at 6.8 years. Here's the detail, from real rooftop data across 5 Maine cities.
Check your own roof in Maine → These are regional figures; your roof's size, pitch and shading move them a lot.
How Maine compares
Maine gets more sunlight than 29% of the cities we measure, and its electricity costs more than 73% of states and provinces. Both matter, but not equally: the electricity rate usually matters more, because solar saves money by replacing power you would otherwise buy. A sunny state with cheap power often pays back slower than a cloudy state with expensive power. Why that happens →
Solar by city in Maine
| City | Sun hrs/yr | Panels | Net cost | Payback |
|---|---|---|---|---|
| Lewiston | 1,428 | 23 | $18,354 | 6.8 yrs |
| Bangor | 1,411 | 23 | $18,354 | 6.8 yrs |
| Portland | 1,386 | 23 | $18,354 | 6.8 yrs |
| Presque Isle | 1,329 | 24 | $19,152 | 7.1 yrs |
| Augusta | 1,270 | 26 | $20,748 | 7.7 yrs |
What a system costs in Maine
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 3,770 | $6,384 | $935 | 6.8 yrs |
| 12 panels | 4.8 kW | 5,655 | $9,576 | $1,402 | 6.8 yrs |
| 16 panels | 6.4 kW | 7,540 | $12,768 | $1,870 | 6.8 yrs |
| 20 panels | 8 kW | 9,425 | $15,960 | $2,337 | 6.8 yrs |
| 26 panels | 10.4 kW | 12,252 | $20,748 | $2,768 | 7.5 yrs |
Payback stops improving as systems grow, then gets worse. You can only save on electricity you were going to buy, so once a system covers your usage the extra panels mostly export at a lower rate.
Maine solar incentives
Every US household can claim the 30% federal residential clean energy credit, which is what the "after credit" figures above assume. On a $26,220 system that is $7,866 back. How the credit works →
State, utility and municipal incentives stack on top and change often — Maine may offer rebates, property or sales tax exemptions, or performance payments. We deliberately don't list specific state programmes here because they change several times a year and stale numbers are worse than none. The DSIRE database is the standard reference and is kept current.
Maine solar questions
Is solar worth it in Maine?
At 24.8¢/kWh and 1,386 usable sun hours, a typical Maine system pays back in about 6.8 years and returns roughly $48,666 across a 25-year panel life. That is a solid return, and rising electricity prices only improve it. Individual cities in Maine vary widely around this average.
How many solar panels do I need in Maine?
About 23 panels for a home using 10,800 kWh a year. Each 400W panel produces roughly 471 kWh annually at Maine sunlight levels. Your own figure depends on actual usage — pull a year of bills rather than assuming average consumption, since heating and EV charging change it a lot.
How much do solar panels cost in Maine?
A 9.2 kW system runs about $26,220 before incentives and $18,354 after the 30% federal credit, or roughly $2.85 per watt installed. Quotes vary widely by installer, roof complexity and whether your electrical panel needs upgrading — get three before deciding.
Worth reading before you buy
Regional estimates generated 2026-08-22 from Google Solar API rooftop samples across 5 Maine cities, and average Maine electricity rates. Not a quote and not financial or tax advice.