Solar in Rhode Island costs about $2.87 per watt, so the typical 7.91 kW system runs about $22,702 before incentives. The price is ordinary, but the power it replaces costs 29.27¢ per kWh. Best-case payback: about 7.3 years, if every kWh the 7.91 kW system makes replaces power at the 29.27¢ state average, with no federal credit at all. Output past 100% of your use earns less, so many homes take longer.
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29.27¢ a kilowatt-hour: the Rhode Island number that carries the case
Rhode Island pays some of the highest electricity prices in America. That one fact does most of the work in the state’s solar math. Every kilowatt-hour your panels make replaces power priced like a luxury good.
With one utility serving nearly every home, there is no shopping your way out of the rate. When the unit price is the problem, making your own units is the direct answer. For the national picture, see our cost comparisons for all 50 states.
An ordinary price against an extraordinary rate: the 7.91 kW Rhode Island payback
The typical system at the September 2026 Edition price, credited near the full retail rate, with no federal residential credit anywhere in the math.
Typical 7.91 kW system at $2.87 per watt
The case never rested on subsidies, so losing them barely dents it. It rests on the rate. Output past 100% of your own use earns only the excess rate, so a system bigger than your use pays back more slowly.
29.27¢ is ranking context, not your filed rateThe monthly bill, the year-one offset and the payback all use the statewide average. Rhode Island Energy files the residential rate about 98% of homes actually pay, so rerun the numbers with the rate on your own bill.
Up to 100% of your use or past it: the line in Rhode Island’s netting law
Rhode Island General Laws chapter 39-26.4 sets net metering in three bands, keyed to your own yearly use. What your production is worth depends on which band it lands in.
Production up to 100% of your use
The strong band. Every kWh offsets supply, distribution, transmission and transition charges.
Production above 100% of your use
A weak credit, moving to the wholesale power price under a 2025 law change. A system sized far above your use earns this low rate on every extra kWh, so oversizing gives value away.
Size to your own useThe statute rewards systems sized to the first band. The typical 7.91 kW system, the median size Rhode Island homeowners installed in 2025, makes about 10,625 kWh a year. That is more than the average home’s 6,800 kWh of use, so check your own bills before you match it.
The 20% cut does not touch rooftop systemsInstaller marketing keeps getting this wrong. The 20% credit reduction added in 2023 applies only to ground-mounted remote net-metering projects. Behind-the-meter rooftop systems are expressly exempt under section 39-26.4-3, and new home rooftop solar still gets the full credit.
What $2.87 a watt buys on a Rhode Island roof, 3 kW to 7.91 kW
The typical system here, 7.91 kW, is close to the 7.95 kW US median. Gross cost by size, before incentives:
Gross cost at $2.87 per watt, before incentives. Size to your yearly use, not your roof: output past 100% of your use earns only the excess rate.
Net metering or a fixed REG price: the second Rhode Island path
Rhode Island’s Renewable Energy Growth program pays participating small systems (up to 25 kW) a fixed price for their production, instead of net metering credits. Ask every installer about it.
Net metering
Credits move with the retail rate. After years of 5.68% yearly growth, net metering wins if rates keep climbing.
Renewable Energy Growth (REG)
A locked price per kWh: 15 years on systems up to 15 kW, 20 years on larger ones. REG wins if you value a known number.
Price both paths on your own usageEnrollment windows and tariff terms are set each year. Have your installer show both options priced against your actual use before you choose.
Pending bills may change the rulesPending legislation (H7269/S3272) may adjust the netting framework. One more reason to get current terms in writing, dated.
Four Rhode Island roofs and pitches where even 29.27¢ cannot rescue the deal
The high rate forgives a lot, but not everything. Hold off if one of these fits:
- A shaded, compact roof. Small systems leave no room for underperformance. An array losing a quarter of its output to shade pays back far more slowly.
- A heat pump or an EV within 2 years. Size for the future load now, or you will be buying expensive grid power anyway. Sizing for today’s 6,800 kWh and doubling use next year wastes the strong band.
- A roof due for replacement. Even a 7.3-year best-case payback argues for reroofing first when fewer than 10 years of roof life remain.
- A pitch built on overproduction. Above 100% of your use, a home system earns only a low excess rate. A quote sized far beyond your bill is a quote written against the statute.
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Rhode Island solar, beyond the rate
Frequently asked questions
How much do solar panels cost in Rhode Island in 2026?
About $2.87 per watt installed (EcoGen Solar Cost Index, September 2026 Edition). The typical 7.91 kW system, the median size Rhode Island homeowners installed in 2025, runs about $22,700 before incentives.
Why is solar payback so fast in Rhode Island?
Because the electricity it replaces costs 29.27¢ per kWh, one of the highest rates in the country. Best-case payback is about 7.3 years, if every kWh the 7.91 kW system makes replaces power at that average, without any federal credit.
Does Rhode Island still have full net metering?
Yes, for rooftop systems sized to your usage. Production up to 100% of your annual consumption is credited at nearly the full retail rate under chapter 39-26.4. Above 100% a home system receives only a much lower excess rate, so sizing discipline matters more here than in most states.
Did Rhode Island cut net metering credits by 20%?
Only for ground-mounted remote net-metering projects. Behind-the-meter rooftop systems are expressly exempt from the 2023 reduction, and new residential rooftop solar still earns the full unreduced credit.
What is the Renewable Energy Growth program?
A state program that pays small systems a fixed price per kilowatt-hour for 15 or 20 years, by system size, instead of net metering credits. It trades upside from rising rates for two decades of certainty; have an installer price both paths against your actual usage.
How we calculate these costs
Cost figures use Rhode Island’s entry in the EcoGen Solar Cost Index (September 2026 Edition), $2.87 per watt as of September 25, 2026, 0.7% below the $2.89 national figure and tied 27th lowest of 51. The 7.91 kW typical size is Berkeley Lab’s 2025 median for Rhode Island single-family installs (2,480 systems). The best-case payback divides the $22,702 cost by the year-one value of the power the system makes, 10,625 kWh at the 29.27¢ state average (about $3,110), with no federal residential credit for host-owned systems.
Sources (7)
- Rhode Island General Assembly, Rhode Island General Laws Chapter 39-26.4 (net metering statute, netting bands and rooftop exemption): webserver.rilegislature.gov
- Rhode Island Office of Energy Resources (OER), Solar Program and Licensing Pages: energy.ri.gov
- U.S. EIA, Electric Power Monthly, residential price by state, 12-month average August 2025 to July 2026: eia.gov
- U.S. EIA, Form EIA-861 Annual Electric Power Industry Report, 2024 (Narragansett Electric, operating as Rhode Island Energy): eia.gov
- U.S. Census Bureau, American Community Survey, 2024: census.gov
- IRS, One, Big, Beautiful Bill Provisions (Public Law 119-21, Section 25D): irs.gov
- DSIRE, Third-Party Solar PV Power Purchase Agreement Policies (May 2026): ncsolarcen-prod.s3.amazonaws.com
