Iowa vs Tennessee Solar Comparison
Tennessee gets more sun (4.3 hrs/day) while Iowa has the faster payback (10.2 years).Iowa offers higher 20-year savings at $28,400.
Iowa
4.2 hrs
10.2yr payback
$28,400
20yr savings
Tennessee
4.3 hrs
11.5yr payback
$26,400
20yr savings
Side-by-Side Comparison
| Metric | Iowa | Tennessee |
|---|---|---|
| Peak Sun Hours | 4.2 hrs | 4.3 hrs |
| Cost per Watt | $3.10 | $3.00 |
| 6kW System Cost | $18,600 | $18,000 |
| Federal Tax Credit | 30% | 30% |
| State Tax Credit | None | None |
| State Rebate | None | None |
| Net Metering | Full Net Metering | No Net Metering |
| Electricity Rate | 15.14¢/kWh | 12.91¢/kWh |
| Payback Period | 10.2 years | 11.5 years |
| 20-Year Savings | $28,400 | $26,400 |
Verdict
Iowa is the better state for solar ROI with $28,400 in 20-year savings and a 10.2-year payback period. Tennessee has more sun exposure at 4.3 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 Iowa or Tennessee?
Tennessee gets more sun (4.3 peak hours/day vs 4.2). Iowa has a faster payback (10.2 years) and Iowa offers higher 20-year savings ($28,400).
How do solar costs compare between Iowa and Tennessee?
A 6kW system costs $18,600 in Iowa vs $18,000 in Tennessee before incentives. Both qualify for the 30% federal tax credit.
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Data verified March 2026 · Source: NREL, DSIRE, EIA