Solar in Maine: market, Net Energy Billing and winter reality

Market snapshot

Solar in Maine by the numbers

Installed capacity

850 MW

Homes powered

125K

Solar share of electricity

9%

Solar jobs in state

1,100

Typical cost per watt

$3.00

US ranking

#32

Maine's solar market grew rapidly after the 2019 Net Energy Billing programme opened. The 2024 NEB restructuring reduced the compensation rate for new residential installations, slowing the pace of new installations but keeping payback workable with the federal tax credit. Portland metro dominates residential; Bangor and smaller cities are smaller markets.

Rates and net metering

Electric rates and how solar export is credited

Incentives

State and local solar incentives in Maine

Beyond the 30 percent federal Residential Clean Energy Credit, which applies in every US state through 2032, Maine has these state and local programmes.

Efficiency Maine Solar + Storage incentive

Efficiency Maine offers residential solar + storage incentives funded through the Regional Greenhouse Gas Initiative (RGGI) and other sources. Current programme structure varies; confirm with Efficiency Maine before quoting.

Sales-tax exemption

Maine exempts residential solar PV equipment from the state's 5.5 percent sales tax under the renewable energy equipment exemption.

No state income tax credit

Maine does not currently offer a state income tax credit for residential solar. The 30 percent federal Residential Clean Energy Credit remains the primary tax-based incentive.

Group Billing (community solar)

Maine permits Group Billing arrangements that let a single solar installation credit multiple customer accounts. This supports community solar farms and multi-household shared arrays.

Permits and interconnection

Permits and interconnection

Permit timelines in Maine are generally moderate. Portland, Lewiston, Bangor and other mid-sized cities commonly take 3 to 6 weeks for residential. Smaller towns handle permits locally with 2 to 4 week typical timelines. SolarAPP+ is not accepted. Interconnection with CMP or Versant typically runs 4 to 8 weeks post-install.

Running a solar company here

Running a solar company in Maine

Running a solar company in Maine means working in a market reshaped by the 2024 NEB restructuring, where the economics are workable but tighter than they were pre-2024. The best Maine operators are explicit about the current NEB credit rate (around 70 to 85 percent of retail) in sales conversations, model winter snow derating honestly, and understand the differences between CMP's and Versant's specific NEB application processes. Lead costs run $100 to $180 on Google search.

Cities we cover

Solar in Maine metros

• Solar in Portland

Questions people ask

Solar in Maine: FAQ

Does Maine have net metering?

Not retail-rate 1-for-1. Maine's Net Energy Billing (NEB) programme credits residential solar exports at a rate tied to the standard offer plus an administrative adjustment, typically around 70 to 85 percent of retail for new installations. Pre-2024 customers are grandfathered on the earlier NEB rate for 20 years.

What changed with Maine NEB in 2024?

The 2024 restructuring reduced the per-kWh value of NEB credits for new installations by adjusting the compensation rate downward. The practical result: payback for new installations stretched by 1 to 2 years compared with pre-2024. Group Billing option continues to permit sharing across multiple accounts for community-solar arrangements.

How much does solar cost in Maine?

Residential solar in Maine averages around $3.00 per watt installed, meaning a typical 7 kW system costs about $21,000 gross. After the 30 percent federal tax credit, net cost is approximately $14,700.

Is solar worth it in Maine?

Yes for most Maine homes with suitable roofs. The combination of relatively high retail rates (around $0.26 per kWh), NEB credits at 70 to 85 percent of retail, and the 30 percent federal credit makes residential solar payback typically 9 to 13 years. Winter snow derating stretches payback; honest annual yield modelling matters.