Maine Solar Guide 2026
Everything Maine homeowners need to know: costs, incentives, net metering policy, and what makes this state unique for solar.
Quick answer
Maine solar economics depend mainly on 4 average peak sun hours, an estimated $3.1/W installed cost, 22.0¢/kWh electricity, and the state's current net-metering rules.
Reviewed 2026-07-26
- Best for
- Maine homeowners comparing solar costs, incentives, and payback assumptions.
- Inputs needed
- annual kWh usage, utility rate, installed $/W, net-metering policy
- Formula used
- Typical production = system kW × peak sun hours × 365.
- Source checked
- state incentive data, utility tariff checks, Wattcrunch price benchmarks
Key fact about Maine solar
Maine's high electricity rates (~$0.22/kWh) and Efficiency Maine rebates make solar viable despite low sun hours and cold winters. CMP's rate hikes have dramatically improved solar economics in recent years.
Peak sun hours
4
hrs/day avg
Avg electricity rate
22.0¢
per kWh
Median install cost
$3.1/W
before incentives
Typical payback
10 yrs
8 kW system, avg usage
Typical 8 kW system in Maine
Annual production
11,680 kWh
Year-1 savings
$2,570
System cost (est.)
$24,800
No federal tax credit — Section 25D expired December 31, 2025.
Maine Net Metering Policy
Full retail net metering (transitioning to CCNM)
Maine is transitioning from full retail net metering to a Competitive Compensation for Net Metering (CCNM) model for new customers. Current retail NEM customers are grandfathered for years. High electricity rates make solar very attractive.
Maine Solar Incentives
Available in addition to any utility rebates. Federal 25D credit is $0 for homeowner-owned systems from 2026.
- ✓Efficiency Maine solar rebate ($400–$2,000 depending on system size)
- ✓Property tax exemption
- ✓Sales tax exemption
Top Utilities in Maine
Interconnection timeline: 6–12 weeks
State-specific decision guide
What to verify before signing a Maine solar quote
In Maine, the financial result depends on more than sunshine or the headline installation price. Confirm the export rule, program eligibility date, and interconnection timeline for your exact utility before treating a payback estimate as a promise.
Export value
This page models full retail net metering (transitioning to ccnm). Ask which tariff and export credit apply to your account, not only which program name appears in the proposal.
Incentive eligibility
Check equipment, income, installer, application, and placed-in-service rules before subtracting an incentive from the quote. Programs can close or change terms.
Interconnection
Budget for the published 6–12 weeks and confirm who pays for a required meter, service upgrade, or engineering review.
Source trail: production assumptions use NREL PVWatts; incentive discovery should be checked against DSIRE; electricity-market context is available from the EIA. Confirm final tax treatment with the IRS and your utility.
Calculate your Maine solar economics
Our calculators are pre-filled with Maine data. Run any tool below.