EnergyTools

Solar Panel Cost in Portland, ME

Estimated costs and savings for ZIP code 04101 — updated for 2026

Urgent tax credit deadlines

  • Section 30D EV credit (up to $7,500) — expires June 30, 2026 (12 days left).
  • Section 48E solar ITC safe harbor — construction must start by July 4, 2026 (16 days left).
See the full deadline tracker

Gross Cost

$23,100

7kW system

Annual Savings

$1,603

$134/month

Payback Period

14.4 yrs

Break-even

Peak Sun Hours

4.1

hrs/day avg

Solar System Cost Breakdown — Portland, ME

Estimated costs and savings for different residential solar system sizes in ZIP 04101. Costs based on ME average of $3.30/W and utility rate of $0.18/kWh.

System Cost Savings/yr Payback
4 kW $13,200 $916 14.4 yrs
5 kW $16,500 $1,145 14.4 yrs
6 kW $19,800 $1,374 14.4 yrs
7 kW (typical) $23,100 $1,603 14.4 yrs
8 kW $26,400 $1,832 14.4 yrs
10 kW $33,000 $2,290 14.4 yrs

Solar Production in Portland, Maine

Average Peak Sun Hours

4.1 hours/day

Moderate solar resource — still cost-effective

Est. Annual Production (7kW)

8,904 kWh

Based on 4.1 PSH × 7kW × 365 days × 85% efficiency

Average Utility Rate

$0.18/kWh

High utility rates make solar especially valuable

Cost Per Watt in ME

$3.30/W

Near national average for installed cost

Calculate Your Exact ROI Get Free Solar Quotes

Solar Panel FAQ — Portland, ME

How much do solar panels cost in Portland, ME?
A typical 7kW solar system in Portland, ME (ZIP 04101) costs approximately $23,100 before any incentives. This works out to about $3.30 per watt installed. Smaller systems start around $13,200, while larger 10kW systems can cost up to $33,000.
How long is the solar payback period in Portland?
The average solar payback period in Portland, ME is approximately 14.4 years for a 7kW system. With estimated annual savings of $1,603, the system pays for itself and then generates free electricity for the remaining 15-20+ years of its lifespan.
How much can I save with solar panels in 04101?
Homeowners in Portland, ME (ZIP 04101) can save approximately $134 per month or $1,603 per year with a standard 7kW solar system. Over 25 years, total savings can exceed $40,075, depending on utility rate increases.
How many peak sun hours does Portland get?
Portland, ME receives an average of 4.1 peak sun hours per day. This is near the national average, making solar a solid investment in this area.
What size solar system do I need for my home in Portland?
The average home in Portland, ME needs a 7kW solar system to offset their electricity usage. The exact size depends on your monthly electric bill, roof orientation, and available space. A 7kW system would produce approximately 8,904 kWh annually in ZIP 04101.

Solar Tools for Maine

ROI Calculator

Exact payback analysis

System Sizer

Find your ideal kW

Incentive Finder

ME rebates & credits

Looking for another area? Browse all ZIP codes →