Rhode Island solar calculator
Size a Rhode Island home solar system from your electric bill — kW, panel count, roof area, true cost with no federal credit for 2026 installs, and payback.
Quick answer: At $0.283/kWh and 4.2 peak sun hours, a $200/month bill needs about 7.38 kW — 18 × 410 W panels covering ~36 m². Gross cost is ~$20,590 with no federal credit for systems installed after 2025, offsetting $2,400 a year for a ~8.6 year payback.
Your details
Ballpark, not gospel. Ballpark, not gospel. Sized at 78% real-world output with the Rhode Island sun-hour average (4.2 peak sun hours) — confirm shading, roof angle and your interconnection date’s tariff with a local installer before buying: pre-April 2023 systems keep grandfathered 1:1 credits, new ones don’t. New systems earn a tariff-specific credit (~$0.2755/kWh) below full retail with monthly rollover, and the annual March true-up pays avoided cost. The calculator values all generation at your retail rate, so treat its savings as the optimistic case — real savings track self-consumption.
The 30% credit ended — what changed
The residential clean energy credit (26 U.S.C. § 25D) gave homeowners a 30% credit on solar installed from 2022 through 2025. The July 2025 tax law ended it: no credit is available for property placed in service after December 31, 2025. That is why every figure on this page is ~30% higher than pre-2026 guides show. If your system went live by the end of 2025, tick the box above to see the credit applied; leased systems may still benefit because the leasing company claims the commercial credit. Source: IRS — Residential Clean Energy Credit.
Typical Rhode Island system sizes by monthly bill
| Monthly bill | System size | Panels (410 W) | Net cost (no 2026 federal credit) | Payback |
|---|---|---|---|---|
| $100 | 3.69 kW | 9 | $10,295 | 8.6 years |
| $200 | 7.38 kW | 18 | $20,590 | 8.6 years |
| $300 | 11.07 kW | 27 | $30,885 | 8.6 years |
Computed at $0.283/kWh, 4.2 peak sun hours and $2.79/W installed, with no federal credit for 2026 installs. Run your exact bill above.
Solar in Rhode Island: the details
Solar cost in Rhode Island
Rhode Island installs sit in the national middle — but they displace some of the priciest electricity in the country. The EnergySage marketplace averaged about $2.79 per watt installed in 2026, with market quotes typically landing $2.37–$3.20/W — within the $2.50–$3.50/W national band. A typical ~13 kW system grosses around $36,300, with no federal credit for 2026 homeowner installs — though the REG program can beat retail rates outright.
What moves the number: roof complexity, panel tier, and how competitive the quote market is in your metro. Get at least three quotes — spreads of $0.50/W between installers are common.
Export rules: getting paid for surplus power
Rhode Island no longer offers 1:1 net metering for new systems. Systems interconnected after April 2023 earn a tariff-specific renewable net-metering credit (~$0.2755/kWh) — below the full retail rate — with monthly rollover and an annual March true-up at avoided cost. Pre-April 2023 systems keep grandfathered full 1:1 retail credits (~$0.30/kWh).
Practical takeaway: new systems should lean on self-consumption, not exports. The tariff credit is only slightly below retail, but the March avoided-cost true-up punishes oversizing — and net metering and the RE Growth program are mutually exclusive, so a quote counting both is wrong.
Rhode Island solar incentives
Rhode Island’s Renewable Energy Growth (REG) program offers 15–20 year performance contracts paying around 32–34 cents/kWh (2026 ceiling), and the Renewable Energy Fund grants up to $1.65/W (max $14,500). Critical: REG and net metering are mutually exclusive — you pick one; a quote counting both is wrong. REF grants need a shade score of 80%+ TSRF. Pre-April 2023 systems keep grandfathered full 1:1 retail credits (~$0.30/kWh) instead.
Is solar worth it in Rhode Island?
Verdict: a strong yes on the numbers. The calculator puts a $200/month bill at a ~8.6-year payback with no federal credit — near-New England-record residential rates (~$0.283/kWh) mean every self-consumed kWh is gold. And the REG program can pay 32–34¢/kWh on a 15–20 year contract — more than retail — if you take the contract route instead of net metering. Just don’t double-count: pick REG or net metering, never both.
Questions people actually ask
Straight answers, no fluff. Then run your own numbers above.
How many solar panels do I need in Rhode Island?
It follows your bill. At the Rhode Island average of $0.283/kWh and 4.2 peak sun hours, a $200/month bill needs about a 7.38 kW system — roughly 18 × 410 W panels covering ~36 m² of roof.
What is the average cost of solar panels in Rhode Island in 2026?
The EnergySage marketplace averaged about $2.79 per watt installed in 2026, with market quotes typically $2.37–$3.20/W — within the national $2.50–$3.50/W band. A typical ~13 kW system grosses around $36,300, with no federal credit for 2026 homeowner installs.
Does Rhode Island have net metering?
Tariff-based, not 1:1 for new systems. Systems interconnected after April 2023 earn a tariff-specific renewable net-metering credit (~$0.2755/kWh) below the full retail rate, with monthly rollover and an annual March true-up at avoided cost. Pre-April 2023 systems keep grandfathered full 1:1 retail credits (~$0.30/kWh).
Does Rhode Island offer any solar tax credit or rebate?
The Renewable Energy Growth program offers 15–20 year performance contracts paying around 32–34 cents/kWh (2026 ceiling), and the Renewable Energy Fund grants up to $1.65/W (max $14,500) with an 80%+ shade score — but REG and net metering are mutually exclusive, so a quote counting both is wrong.
Is the 30% federal solar tax credit still available?
Not for homeowner purchases anymore. The residential clean energy credit (26 U.S.C. § 25D) is not available for property placed in service after December 31, 2025, under the July 2025 tax law (Public Law 119-21). Systems installed by the end of 2025 can still claim 30%, and leased systems may still benefit because the leasing company claims the commercial credit instead. (Source: IRS — Residential Clean Energy Credit.)
Is solar worth it in Rhode Island?
The calculator puts a $200/month bill at a ~8.6-year payback with no federal credit — strong, driven by near-record residential rates. The REG program can pay 32–34¢/kWh on a long contract if you take that route instead of net metering — just never count both.
Figures last checked October 2026. Sources: EIA Electric Power Monthly (July 2026: 28.29¢/kWh), NREL PVWatts/NSRDB (~3.7–4.7 peak sun hours), DSIRE, Rhode Island Public Utilities Commission; IRS — Residential Clean Energy Credit.
More US solar calculators
Compare other states: Texas, Florida, California, Arizona, North Carolina, New Mexico, New York, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina. And the national US solar calculator for country averages.
Comparing quotes? The solar cost calculator breaks down cost per watt and the solar ROI calculator maps your payback year by year. Going deeper: installation cost guide, how net metering works, how much you can save with solar and the solar batteries guide.