Solar Panels in Portland, Maine
Portland receives 1284.5 kWh per kWp of solar panels per year — 15.7% below the US national average of 1,550 kWh/kWp. At Maine's electricity rate of 30.73¢/kWh, an 8 kW system saves roughly $3,158/year and pays back in 4.8 years.
Solar is exceptionally worth it in Portland. Note: The 30% federal solar tax credit (Section 25D) expired December 31, 2025. The numbers below reflect today's actual costs.
Portland Solar at a Glance
Last updated: April 11, 2026 · Sources: PVGIS v5.3, EIA
How Much Solar Power Does Portland Get Each Month?
Monthly solar yield (kWh per kWp installed) based on PVGIS satellite data for 43.66°N, 70.26°W.
Live Solar Forecast for Portland
Real-time generation estimate for an 8 kW system based on today's weather forecast. Data: forecast.solar.
Is a Home Battery Worth It in Portland?
A battery stores excess midday solar for use at peak evening hours. At 30.73¢/kWh in Portland, here is the math for the two most popular options.
10-year value: $12,110 · Based on 365 cycles/yr, 30.73¢/kWh, 80% usable capacity. Does not include backup value or utility TOU rate savings.
10-year value: $8,600 · Based on 350 cycles/yr, 30.73¢/kWh, 80% usable capacity. Does not include backup value or utility TOU rate savings.
Battery ROI improves significantly in states with Time-of-Use (TOU) rates where peak electricity can cost 2–3× the off-peak rate. California (PG&E, SCE, SDG&E), New York (ConEd), and Massachusetts (Eversource) have the strongest TOU incentives for battery storage.
What Are the 25-Year Solar Savings in Portland?
Based on 1284.5 kWh/kWp/yr yield, 30.73¢/kWh electricity rate, and a 2026 system cost of $2.80/W. Federal tax credit expired Dec 31, 2025 — not included.
What Solar Incentives Are Available in Portland, Maine?
The federal ITC expired in 2025. These state and utility incentives still apply in Maine.
Solar Panels in Portland: Frequently Asked Questions
How much do solar panels cost in Portland, Maine in 2026?
Is solar worth it in Portland without the federal tax credit?
How much electricity do solar panels produce in Portland?
What solar incentives are available in Portland, Maine?
How long is the solar payback period in Portland?
Environmental Impact & Home Value in Portland
An 8 kW solar system in Portland produces roughly 10,276 kWh/year. Here is what that means beyond your electricity bill.
How Many Solar Panels Do You Need in Portland?
The right system size depends on your annual electricity usage and how much of your bill you want to offset. In Portland, where annual solar yield is 1284.5 kWh per kWp, here is what different households typically need:
| Annual usage | System size | Panels (400 W) | Est. cost | Annual savings |
|---|---|---|---|---|
| 6,000 kWh Small home | 4.7 kW | 12 panels | $13,160 | $1,844/yr |
| 10,800 kWh Average home | 8.5 kW | 22 panels | $23,800 | $3,319/yr |
| 15,000 kWh Large home | 11.7 kW | 30 panels | $32,760 | $4,610/yr |
| 20,000 kWh Large + EV | 15.6 kW | 39 panels | $43,680 | $6,146/yr |
Costs based on $2.80/W installed (2026 US average). Panel count assumes 400 W modules. Savings based on current 30.73¢/kWh rate. State incentives not included — see above for Maine credits.
PortlandSolar Resources & 2026 Incentives
Key information for homeowners in Portland going solar in 2026 — after the federal 30% tax credit expired December 31, 2025.
The 30% Section 25D residential solar credit expired December 31, 2025. An 8 kW system in Portland costs $22,400 after any applicable state credits. The commercial Section 48 credit (for businesses, landlords) was not affected.
IRS Residential Clean Energy Credit →Maine has a net metering policy. Contact your local utility for current export rates.
DSIRE — Maine Incentive Database →Sales tax exemption, Efficiency Maine rebates ($500–1,500), net energy billing
- PVGIS — EU JRC Solar Yield Data(yield figures on this page)
- EIA — Maine Electricity Profile(electricity rates)
- DSIRE — Maine Solar Incentives(incentives & rebates)
- Lawrence Berkeley Lab — Tracking the Sun(installed cost data)
- NREL — Solar Panel Degradation Study(lifespan & performance)