Illinois vs New Mexico Solar Comparison
New Mexico gets more sun (6.2 hrs/day) while New Mexico has the faster payback (7.5 years).New Mexico offers higher 20-year savings at $36,800.
Illinois
4.0 hrs
9yr payback
$32,600
20yr savings
New Mexico
6.2 hrs
7.5yr payback
$36,800
20yr savings
Side-by-Side Comparison
| Metric | Illinois | New Mexico |
|---|---|---|
| Peak Sun Hours | 4.0 hrs | 6.2 hrs |
| Cost per Watt | $3.15 | $2.80 |
| 6kW System Cost | $18,900 | $16,800 |
| Federal Tax Credit | 30% | 30% |
| State Tax Credit | None | 10% |
| State Rebate | None | None |
| Net Metering | Full Net Metering | Full Net Metering |
| Electricity Rate | 16.27¢/kWh | 15.34¢/kWh |
| Payback Period | 9 years | 7.5 years |
| 20-Year Savings | $32,600 | $36,800 |
Verdict
New Mexico is the better state for solar ROI with $36,800 in 20-year savings and a 7.5-year payback period. New Mexico has more sun exposure at 6.2 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 Illinois or New Mexico?
New Mexico gets more sun (6.2 peak hours/day vs 4). New Mexico has a faster payback (7.5 years) and New Mexico offers higher 20-year savings ($36,800).
How do solar costs compare between Illinois and New Mexico?
A 6kW system costs $18,900 in Illinois vs $16,800 in New Mexico before incentives. Both qualify for the 30% federal tax credit.
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Data verified March 2026 · Source: NREL, DSIRE, EIA