Delaware vs South Dakota Solar Comparison
South Dakota gets more sun (4.6 hrs/day) while Delaware has the faster payback (9.8 years).Delaware offers higher 20-year savings at $30,200.
Delaware
4.2 hrs
9.8yr payback
$30,200
20yr savings
South Dakota
4.6 hrs
11.2yr payback
$26,200
20yr savings
Side-by-Side Comparison
| Metric | Delaware | South Dakota |
|---|---|---|
| Peak Sun Hours | 4.2 hrs | 4.6 hrs |
| Cost per Watt | $3.00 | $3.10 |
| 6kW System Cost | $18,000 | $18,600 |
| Federal Tax Credit | 30% | 30% |
| State Tax Credit | None | None |
| State Rebate | None | None |
| Net Metering | Full Net Metering | Partial Net Metering |
| Electricity Rate | 14.94¢/kWh | 13.74¢/kWh |
| Payback Period | 9.8 years | 11.2 years |
| 20-Year Savings | $30,200 | $26,200 |
Verdict
Delaware is the better state for solar ROI with $30,200 in 20-year savings and a 9.8-year payback period. South Dakota has more sun exposure at 4.6 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 South Dakota?
South Dakota gets more sun (4.6 peak hours/day vs 4.2). Delaware has a faster payback (9.8 years) and Delaware offers higher 20-year savings ($30,200).
How do solar costs compare between Delaware and South Dakota?
A 6kW system costs $18,000 in Delaware vs $18,600 in South Dakota before incentives. Both qualify for the 30% federal tax credit.
Explore More
Was this data helpful?
Data verified March 2026 · Source: NREL, DSIRE, EIA