Idaho vs South Dakota Solar Comparison
Idaho gets more sun (4.7 hrs/day) while South Dakota has the faster payback (11.2 years).South Dakota offers higher 20-year savings at $26,200.
Idaho
4.7 hrs
12.5yr payback
$22,400
20yr savings
South Dakota
4.6 hrs
11.2yr payback
$26,200
20yr savings
Side-by-Side Comparison
| Metric | Idaho | South Dakota |
|---|---|---|
| Peak Sun Hours | 4.7 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 | 11.15¢/kWh | 13.74¢/kWh |
| Payback Period | 12.5 years | 11.2 years |
| 20-Year Savings | $22,400 | $26,200 |
Verdict
South Dakota is the better state for solar ROI with $26,200 in 20-year savings and a 11.2-year payback period. Idaho has more sun exposure at 4.7 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 Idaho or South Dakota?
Idaho gets more sun (4.7 peak hours/day vs 4.6). South Dakota has a faster payback (11.2 years) and South Dakota offers higher 20-year savings ($26,200).
How do solar costs compare between Idaho and South Dakota?
A 6kW system costs $18,000 in Idaho vs $18,600 in South Dakota before incentives. Both qualify for the 30% federal tax credit.
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Data verified March 2026 · Source: NREL, DSIRE, EIA