Alabama vs Illinois Solar Comparison
Alabama gets more sun (4.5 hrs/day) while Illinois has the faster payback (9 years).Illinois offers higher 20-year savings at $32,600.
Alabama
4.5 hrs
11.2yr payback
$28,400
20yr savings
Illinois
4.0 hrs
9yr payback
$32,600
20yr savings
Side-by-Side Comparison
| Metric | Alabama | Illinois |
|---|---|---|
| Peak Sun Hours | 4.5 hrs | 4.0 hrs |
| Cost per Watt | $2.95 | $3.15 |
| 6kW System Cost | $17,700 | $18,900 |
| Federal Tax Credit | 30% | 30% |
| State Tax Credit | None | None |
| State Rebate | None | None |
| Net Metering | Partial Net Metering | Full Net Metering |
| Electricity Rate | 14.87¢/kWh | 16.27¢/kWh |
| Payback Period | 11.2 years | 9 years |
| 20-Year Savings | $28,400 | $32,600 |
Verdict
Illinois is the better state for solar ROI with $32,600 in 20-year savings and a 9-year payback period. Alabama has more sun exposure at 4.5 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 Alabama or Illinois?
Alabama gets more sun (4.5 peak hours/day vs 4). Illinois has a faster payback (9 years) and Illinois offers higher 20-year savings ($32,600).
How do solar costs compare between Alabama and Illinois?
A 6kW system costs $17,700 in Alabama vs $18,900 in Illinois before incentives. Both qualify for the 30% federal tax credit.
Explore More
Was this data helpful?
Data verified March 2026 · Source: NREL, DSIRE, EIA