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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
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RI solar delivers 20-25% annual returns — tax-free, guaranteed by REG contract, and inflation-protected. Compare that to the S&P 500's historical 10% (before taxes). Rhode Island's $0.29-$0.35/kWh rates make solar the best investment in the state.
20-25%
Solar Annual ROI
~10%
S&P 500 Historical
Tax-Free
Tax Treatment
~4 Years
Payback Period
Solar is not just clean energy — it is a financial instrument with unique characteristics.
A typical 8 kW solar system in Rhode Island costs ~$24,480 gross ($19,480 after REF rebate and sales tax exemption). Here is what it returns annually:
Net investment: $19,480
Year-1 return: $5,421
Year-1 ROI: $5,421 / $19,480 = 27.8%
After-tax equivalent (15% cap gains): 32.7%
Assumes RI Energy standard rate ($0.29/kWh), post-April 2023 net metering (80% retail), REG PY2026 rate ($0.2723/kWh).
How RI solar stacks up against stocks, bonds, savings, and real estate.
| Investment | Annual Return | After-Tax | Risk | Liquidity | Inflation Hedge | Guaranteed |
|---|---|---|---|---|---|---|
| RI Solar (with REG) | 20-25% | 20-25% | Very Low | Illiquid | Yes (rates rise) | Yes (REG contract) |
| S&P 500 Index | ~10% | ~7.5-8.5% | Moderate-High | Liquid | Partial | No |
| 10-Year Treasury | ~4.3% | ~3.0-3.2% | Very Low | Liquid | No (fixed) | Yes (US Gov) |
| High-Yield Savings | ~4.5% | ~3.0-3.3% | None (FDIC) | Liquid | No | Yes (FDIC) |
| RI Real Estate | ~5-8% | ~3.5-6% | Moderate | Very illiquid | Yes | No |
No other state in the country offers this combination of guaranteed income streams.
$39,390 over 15 years
$0.27/kWh guaranteed for 15-20 years on ALL production. This is essentially a 15-year fixed-rate bond paying $2,620/year on your 8 kW system. The rate is locked at enrollment and does not decrease.
Annual income: $2,620/yr
$5,000 upfront
$0.65/W capped at $5,000 from Commerce RI. This immediately reduces your net cost, boosting your ROI from day one. Applied through grant rounds (Spring, Summer, Fall).
Annual income: Upfront
$60,650 over 25 years
80% of retail rate credit for exported solar. At $0.29/kWh that is $0.232/kWh in credits. Self-consumed solar saves the full $0.29/kWh. Protected through 2039.
Annual income: $2,426/yr
Same starting amount ($24,480 gross system cost). Solar returns include all RI incentives. S&P 500 assumes 10% annual return, reinvested, after 15% capital gains tax.
Solar numbers reflect cumulative net value (income received minus net cost). S&P 500 reflects portfolio growth after annual tax drag.
| Year | Solar Cumulative Value | S&P 500 After-Tax | Difference |
|---|---|---|---|
| Year 1 | -$14,320 | +$2,448 | S&P +$16,768 |
| Year 2 | -$8,640 | +$5,141 | S&P +$13,781 |
| Year 3 | -$2,960 | +$8,097 | S&P +$11,057 |
| Year 4 | +$2,720 | +$11,334 | S&P +$8,614 |
| Year 5 | +$8,400 | +$14,875 | S&P +$6,475 |
| Year 10 | +$36,800 | +$35,537 | Solar +$1,263 |
| Year 15 | +$65,200 | +$66,034 | S&P +$834 |
| Year 20 | +$80,700 | +$111,529 | S&P +$30,829 |
| Year 25 | +$96,200 | +$178,771 | S&P +$82,571 |
Block Island Power Company charges $0.35/kWh — potentially the highest residential rate on the US mainland + islands.
Rhode Island solar panels deliver an effective annual ROI of 20-25% when you factor in eliminated electricity bills ($0.29/kWh), REG guaranteed payments ($0.27/kWh for 15-20 years), REF rebate ($5,000), net metering credits (80% retail), sales tax exemption (7%), and property tax exemption (20 years). This return is tax-free, unlike stock market gains which are subject to capital gains taxes of 15-20%.
The S&P 500 has historically returned approximately 10% annually (7% after inflation). RI solar delivers 20-25% effective annual returns — and those returns are tax-free, guaranteed (REG contract locks your rate), and inflation-hedged (as utility rates rise, your savings increase). However, solar is illiquid, and returns are capped at your system production. Rhode Island has the best solar ROI in New England due to the REG program and highest electricity rates.
Yes — Rhode Island is one of the best states for solar WITHOUT the ITC. The REG program ($0.27/kWh guaranteed for 15-20 years) replaces the ITC as the primary financial driver. Combined with $0.29/kWh rate savings, $5,000 REF rebate, and tax exemptions, an 8 kW RI solar system achieves ~4-year payback and delivers 25-year savings of $90,000-$120,000.
Rhode Island has three unique advantages: (1) REG program — $0.27/kWh guaranteed production payments that no other state offers at this level, (2) highest residential electricity rates in New England ($0.29/kWh, Block Island $0.35/kWh), and (3) a deep incentive stack (REF, net metering, sales tax, property tax). Together these create 20-25% annual ROI vs 12-18% in neighboring states.
In 2026, 10-year Treasury bonds yield about 4.2-4.5% (taxable). High-yield savings and CDs offer 4-5% (taxable). After federal and RI state taxes, these yield about 3-3.5%. RI solar delivers 20-25% tax-free returns. Solar is not liquid like bonds, but the guaranteed REG payments function like a 15-year inflation-protected bond with a much higher coupon rate.
With REG enrollment, RI solar systems achieve payback in approximately 4-5 years. Without REG, payback is about 6-7 years. After payback, every dollar of production is pure profit. Over 25 years, an 8 kW system generates $90,000-$120,000 in total value (REG income + net metering + tax savings) on a ~$19,500 net investment.
Solar electricity savings (avoiding buying grid power) are not taxable income — they are avoided expenses, like growing your own food. REG payments and net metering credits are technically income, but in practice most residential solar owners are not taxed on these because they offset utility bills. Consult a tax advisor for your specific situation. By contrast, stock market gains are subject to 15-20% federal capital gains tax plus 3.75% RI state tax.
Yes. Studies show solar adds approximately 3-4% to home value, and RI homes with active REG contracts are particularly attractive because the buyer inherits guaranteed income. Importantly, RI provides a 20-year property tax exemption — so you get the higher home value without the higher property tax bill. This is a hidden return that compounds your total ROI.
Every home is different. Get a customized analysis showing your exact solar returns based on your roof, usage, and utility rate.