Delaware vs Rhode Island Solar Comparison
Delaware gets more sun (4.2 hrs/day) while Rhode Island has the faster payback (6.5 years).Rhode Island offers higher 20-year savings at $48,600.
Delaware
4.2 hrs
9.8yr payback
$30,200
20yr savings
Rhode Island
3.8 hrs
6.5yr payback
$48,600
20yr savings
Side-by-Side Comparison
| Metric | Delaware | Rhode Island |
|---|---|---|
| Peak Sun Hours | 4.2 hrs | 3.8 hrs |
| Cost per Watt | $3.00 | $3.40 |
| 6kW System Cost | $18,000 | $20,400 |
| Federal Tax Credit | 30% | 30% |
| State Tax Credit | None | None |
| State Rebate | None | None |
| Net Metering | Full Net Metering | Full Net Metering |
| Electricity Rate | 14.94¢/kWh | 28.08¢/kWh |
| Payback Period | 9.8 years | 6.5 years |
| 20-Year Savings | $30,200 | $48,600 |
Verdict
Rhode Island is the better state for solar ROI with $48,600 in 20-year savings and a 6.5-year payback period. Delaware has more sun exposure at 4.2 hrs/day, making it ideal for maximum energy production. Both states qualify for the 30% federal solar tax credit.
Frequently Asked Questions
Is solar better in Delaware or Rhode Island?
Delaware gets more sun (4.2 peak hours/day vs 3.8). Rhode Island has a faster payback (6.5 years) and Rhode Island offers higher 20-year savings ($48,600).
How do solar costs compare between Delaware and Rhode Island?
A 6kW system costs $18,000 in Delaware vs $20,400 in Rhode Island before incentives. Both qualify for the 30% federal tax credit.
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Data verified March 2026 · Source: NREL, DSIRE, EIA