Solar Panels in Portsmouth, RI: Cost, Payback & Savings
A typical 5.2 kW home solar system in Portsmouth costs about $18,200 and pays for itself in about 8.4 years, saving roughly $46,182 over 25 years at Rhode Island's average electricity price of 29.2¢/kWh.
Monthly solar production in Portsmouth
Estimated output of a 5.2 kW south-facing roof system. Jul is the strongest month (747 kWh); Dec the weakest (319 kWh).
Solar production (kWh) Typical home use, 567 kWh/month
Solar payback calculator for Portsmouth
Pre-filled with Portsmouth's sunshine and Rhode Island's average electricity price. Enter your own bill and an installer's price per watt to see your payback.
Leave export credit blank where the utility offers full net metering. Where exports earn less, solar used at home as it's produced is worth the full price and the rest earns the export credit.
How Portsmouth compares
- Each kW of panels here produces about 1,325 kWh a year — about the same as the Rhode Island median and 3% less than the US median city (1,371 kWh).
- Payback ranks #7 of 29 Rhode Island places we cover.
- Sunshine varies little across a state; electricity price, installed cost and how utilities credit exported power drive most of the difference between states.
Net metering, tax credits and incentives in 2026
Rhode Island offers net metering: power you send to the grid is credited at or near the retail price, so every solar kWh is valued at 29.2¢ here.
There is no federal tax credit for buying home solar installed in 2026. The 30% Residential Clean Energy Credit (Section 25D) ended for systems placed in service after December 31, 2025, so the costs and paybacks on this page include no federal credit.
Rhode Island and local utilities may still offer rebates, performance payments, property-tax or sales-tax exemptions. Search the DSIRE incentives database for Rhode Island and ask installers which programs they apply for you.
Frequently asked questions
Is solar worth it in Portsmouth, RI?
For a typical home, a solar system pays for itself in about 8.4 years and then keeps saving money. Over 25 years the estimated net savings are $46,182. Verdict: strong investment. Your own payback depends on your roof, your bill and the quotes you get.
How many solar panels do I need in Portsmouth, RI?
A home using 567 kWh a month (the Rhode Island average) needs about 13 panels of 400 W — a 5.2 kW system — to cover its annual use. Divide your own yearly kWh by 1,325 to get the kW you need.
How much do solar panels cost in Portsmouth, RI?
At 3.50 dollars per watt, a 5.2 kW system costs about $18,200 before any state or utility incentives. There is no federal tax credit for systems installed in 2026.
How much sun does Portsmouth get?
Portsmouth averages 4.7 peak sun hours per day, so each kilowatt of panels produces about 1,325 kWh a year.
Does Rhode Island have net metering?
Yes. Power sent back to the grid is credited at or near the retail price (29.2¢ per kWh on average).
How much does electricity cost in Rhode Island?
Residential electricity in Rhode Island averages 29.2¢ per kWh, and a typical home uses 567 kWh a month (EIA).
Solar payback in nearby places
- Middletown8.1 yrs
- Bristol8.4 yrs
- Newport East8.1 yrs
- Newport8.3 yrs
- Warren8.6 yrs
- Barrington8.6 yrs
- Warwick8.5 yrs
- East Greenwich8.4 yrs