Solar Calculator for Rhode Island: Costs, Incentives & ROI
Rhode Island offers some of the fastest solar payback periods in the continental United States, driven by electricity rates that average approximately twenty-six cents per kilowatt-hour — among the three highest in the contiguous forty-eight states alongside Maine and Connecticut. Rhode Island Energy, formerly National Grid's Rhode Island utility and acquired by PPL Corporation in 2022, serves approximately ninety-nine percent of Rhode Island's residential customers. The primary solar compensation framework is Net Metering under the Rhode Island Public Utilities Commission, crediting excess solar exports at the full retail rate. Rhode Island additionally operates the Renewable Energy Growth program, a performance-based alternative offering fixed-price fifteen-to-twenty-year contracts paid per kilowatt-hour of solar production. Homeowners can choose between Net Metering for simplicity and retail-rate credits or REG for long-term price certainty; REG enrollment opens through periodic lottery administered by Rhode Island Energy. Rhode Island's property tax treatment of solar is comprehensive: R.I. Gen. Laws Section 44-3-21 exempts solar energy systems from local property tax assessment. Solar equipment is also exempt from the state's seven-percent sales tax under R.I. Gen. Laws Section 44-18-30(57). Combined with approximately twenty-six-cent electricity rates and the thirty-percent federal Investment Tax Credit, Rhode Island presents one of the strongest financial cases for residential solar in the country despite its modest solar resource.
Incentive data updated: May 2026(may be outdated)
Average Solar Cost in Rhode Island
Average installed solar costs in Rhode Island typically range from $3.00 to $3.35 per watt before the federal Investment Tax Credit, reflecting New England labor market pricing — comparable to Connecticut and above lower-cost markets in the Mountain West. A standard six-kilowatt system costs approximately $18,000 to $20,100 before incentives; the thirty-percent ITC reduces net cost to roughly $12,600 to $14,100. The sales tax exemption under R.I. Gen. Laws Section 44-18-30(57) provides an additional upfront saving by exempting panels, inverters, and installation materials from the state's seven-percent sales tax. Rhode Island does not offer a statewide solar credit beyond the federal ITC, but the combination of the ITC and both tax exemptions makes the net investment considerably more attractive than gross installed cost suggests. At twenty-six cents per kilowatt-hour, a six-kilowatt installation producing approximately six thousand eight hundred kilowatt-hours annually generates roughly one thousand seven hundred dollars in annual savings at current rates. Homeowners should obtain three competitive bids from DBR-licensed electrical contractors to identify market pricing for their specific roof configuration and local municipality permitting timeline.
- Avg. installed cost
- $3.20/W
- Typical 6 kW system
- $18,500–$20,500
Top Solar Incentives in Rhode Island
Live incentive data not currently available for Rhode Island. See the federal incentive guidance via our Solar Tax Credit Calculator.
Electricity Rates in Rhode Island
Rhode Island's residential electricity rates average approximately twenty-five to twenty-seven cents per kilowatt-hour on a blended basis, consistently placing the state in the top three for electricity costs among the contiguous forty-eight states. The high retail rate is the most powerful driver of Rhode Island's solar economics: every kilowatt-hour of solar electricity consumed directly in the home avoids a twenty-six-cent grid purchase — more than two and a half times the savings of a ten-cent market like Utah. Time-of-use rate schedules are available through Rhode Island Energy for customers who want to optimize EV charging or battery storage dispatch. The REG Performance-Based program's fixed-price contract appeals to homeowners seeking long-term certainty: contracts lock in a per-kilowatt-hour payment over fifteen to twenty years, insulating homeowners from future net metering policy risk. Block Island Power Company customers on the isolated island grid face different economics due to substantially higher island electricity costs.
Peak Sun Hours in Rhode Island
Rhode Island's solar resource is moderate by national standards, reflecting its New England location at approximately forty-two degrees north latitude. Providence receives approximately four point two to four point six peak sun hours per day on a south-facing tilted surface, comparable to southern Connecticut. A six-kilowatt system in Providence typically produces approximately six thousand four hundred to six thousand eight hundred kilowatt-hours per year — less than the same system in Utah or Arizona, but far more economically valuable due to Rhode Island's high retail rate. The economic calculation inverts the conventional solar narrative: a Rhode Island system that produces less electricity than a Utah system earns more per kilowatt-hour in avoided costs at twenty-six cents. Rhode Island's moderate but reliable solar resource, combined with high electricity rates, produces some of the fastest payback periods in the country. South-facing roof orientations with minimal shading produce the strongest annual output.
Example ROI for a 6 kW System
- Estimated annual savings
- $1,700
- Payback period
- 7.0 years
- 25-year net savings
- $36,000
Run a personalized estimate with your ZIP code using the Solar ROI Calculator.
Major Cities in Rhode Island
- Providence02903
- Warwick02886
- Cranston02910
- Pawtucket02860
- Newport02840
Common Questions About Solar in Rhode Island
Why is solar payback so fast at Rhode Island's 26-cent electricity rates?
Rhode Island's approximately twenty-six-cent per kilowatt-hour electricity rate is the fundamental driver of the state's exceptional solar economics. Every kilowatt-hour of solar electricity a Rhode Island homeowner consumes directly — running appliances, heating water, charging an EV — avoids a twenty-six-cent grid purchase. A six-kilowatt system in Providence producing approximately six thousand eight hundred kilowatt-hours annually with a ninety-five-percent consumption offset generates roughly one thousand seven hundred dollars in annual savings. After the thirty-percent federal Investment Tax Credit reduces net installed cost to approximately twelve thousand to fourteen thousand dollars, and factoring in Rhode Island's sales tax exemption under R.I. Gen. Laws Section 44-18-30(57), the net payback period reaches approximately six to eight years — among the fastest in the continental United States. For comparison, the same six-kilowatt system installed in a state with ten-cent electricity rates would generate approximately six hundred to seven hundred dollars annually, requiring nine to eleven years to reach payback despite a potentially lower installed cost. Rhode Island also benefits from the property tax exemption under R.I. Gen. Laws Section 44-3-21, which prevents a solar installation from increasing annual property taxes, and from full-retail-rate net metering compensation for exported solar electricity through Rhode Island Energy under RI PUC authorization.
What is the Renewable Energy Growth (REG) program in Rhode Island?
Rhode Island's Renewable Energy Growth program is a performance-based alternative to standard net metering, administered by Rhode Island Energy under Rhode Island Public Utilities Commission oversight. Unlike net metering, which credits exported solar electricity as a billing offset at the retail rate, REG offers homeowners a fixed-price contract that pays a set rate per kilowatt-hour for all solar electricity the system produces — both electricity consumed on-site and electricity exported to the grid. REG contracts typically run fifteen to twenty years, providing long-term price certainty and insulating homeowners from the risk of future changes to net metering policy or retail electricity rates. REG enrollment is not continuously open: it occurs through periodic lottery and auction processes announced by Rhode Island Energy and the RI PUC. Homeowners interested in REG should check current enrollment status directly with Rhode Island Energy or the RI PUC, as enrollment windows vary by year and are subject to program capacity limits. For homeowners who qualify and enroll, REG can offer competitive returns compared to net metering, particularly if the fixed REG contract rate is set above current wholesale rates. Most Rhode Island homeowners choose standard net metering for its simplicity and the retail-rate compensation it provides for exported electricity; REG is best suited to homeowners who prioritize long-term price certainty and are comfortable with the enrollment process.
Are solar panels sales-tax exempt in Rhode Island?
Yes. Rhode Island exempts solar energy equipment from the state's seven-percent sales tax under R.I. Gen. Laws Section 44-18-30(57). The exemption covers solar photovoltaic panels, inverters, racking and mounting hardware, and related installation materials directly associated with a residential solar energy system. This exemption provides a meaningful upfront cost reduction: for a six-kilowatt system with installed equipment costs of approximately eighteen thousand to twenty thousand dollars, the sales tax exemption saves approximately one thousand two hundred to one thousand four hundred dollars compared to states that do not exempt solar equipment from sales tax. Rhode Island's combined property and sales tax exemptions for solar make it one of the more tax-favorable states in New England for solar investment. The property tax exemption under R.I. Gen. Laws Section 44-3-21 ensures that the increased market value a solar installation adds to the home does not result in higher annual property tax assessments. Together, these two exemptions — sales tax and property tax — add several thousand dollars of long-term value to a Rhode Island solar installation that does not appear in the gross installed cost comparison with states lacking similar protections.
What is the difference between net metering and REG performance-based in Rhode Island?
Net metering and Rhode Island's Renewable Energy Growth program are two distinct solar compensation structures with different mechanics and financial characteristics. Under net metering, your solar system's excess electricity exported to the Rhode Island Energy grid is credited against your electricity bill at the full retail rate — approximately twenty-six cents per kilowatt-hour — with monthly credits rolling forward for twelve months before resetting. Net metering is available continuously to qualifying residential customers and does not require enrollment in a separate program or competitive process. Under REG, you enter a fifteen-to-twenty-year fixed-price contract that pays a set rate per kilowatt-hour for all of your system's solar production — including both the electricity you consume on-site and the electricity exported to the grid. REG enrollment occurs through periodic lottery or auction administered by Rhode Island Energy, meaning it is not always available and requires active participation in the enrollment process. The financial comparison between the two depends on the REG contract rate offered, the retail electricity rate trajectory over the contract period, and the homeowner's preference for price certainty versus flexibility. Net metering is simpler and broadly accessible; REG offers long-term price certainty and may be advantageous if retail electricity rates decline in the future. Most Rhode Island residential solar customers choose net metering, but homeowners who want to lock in a guaranteed return over a fifteen-to-twenty-year horizon should evaluate REG enrollment when it is available.
Best Solar Installers in Rhode Island
Rhode Island requires solar installation contractors to hold an Electrical Contractor license (Class A or B) from the Rhode Island Department of Business Regulation (DBR). Verify contractor license status at the DBR public lookup portal before signing a contract. NABCEP certification is a recommended quality indicator beyond the state licensing minimum.
- Get at least 3 quotes from different installers to compare pricing and equipment.
- Check installer ratings with the BBB before signing a contract.
- Verify contractor licensing with Rhode Island Department of Business Regulation (DBR) — Electrical Contractor license (Class A or B). Ask for proof of a 20–25 year panel warranty.
Top Utility Companies in Rhode Island
Rhode Island Energy (PPL Corporation)
Service area: Providence, Warwick, Cranston, Pawtucket, Newport, most of Rhode Island (~99% residential)
Tariff: tier-2, TOU
Residential rate: 24.0–28.0¢/kWh (as of 2026-05)
NEM program: RI Net Metering at retail rate + REG (Renewable Energy Growth) Performance-Based optional 15–20 year fixed-price contracts via periodic lottery/auction
Block Island Power Company
Service area: Block Island
Tariff: flat
Residential rate: 30.0–40.0¢/kWh (as of 2026-05)
NEM program: Isolated island grid — consult utility directly for NEM terms
Pascoag Utility District
Service area: Pascoag, Burrillville area
Tariff: flat
Residential rate: 23.0–27.0¢/kWh (as of 2026-05)
NEM program: RI PUC Net Metering — retail rate
Net Metering Policy in Rhode Island
- Version
- NEM NEM-1.0
- Effective date
- 2009-04-01
- Buyback rate
- retail
- System size cap
- 25 kW
- Grandfathering
- No NEM transition planned; retail-rate net metering reaffirmed through 2030+ under RI PUC orders
RI Net Metering credits excess solar generation at full retail rate (~26¢/kWh); 12-month credit rollover. Alternative: REG (Renewable Energy Growth) Performance-Based program offers fixed-price 15–20 year contracts ($/kWh paid for all solar production; enrollment via periodic lottery/auction administered by Rhode Island Energy under RI PUC oversight). Customers typically choose NEM (simpler, retail-rate credits) or REG (long-term price certainty via fixed contract). Both programs available under RI PUC jurisdiction. NEM retail-rate compensation reaffirmed through 2030+.
Property Tax Exemption in Rhode Island
- Status
- full
- Exemption
- 100%
- Applies to
- solar-pvstorage
R.I. Gen. Laws § 44-3-21 — solar energy systems exempt from local property tax assessment statewide. A solar installation does not add to a home's assessed value for property tax purposes. Sales tax also exempt under R.I. Gen. Laws § 44-18-30(57) — solar panels, inverters, racking, and installation materials exempt from RI 7% sales tax. Combined with ~26¢/kWh retail rate and full-retail NEM, RI offers some of the fastest solar payback periods in the continental US.