Tennessee vs Washington Solar Comparison
Tennessee gets more sun (4.3 hrs/day) while Tennessee has the faster payback (11.5 years).Tennessee offers higher 20-year savings at $26,400.
Tennessee
4.3 hrs
11.5yr payback
$26,400
20yr savings
Washington
3.5 hrs
12.5yr payback
$22,800
20yr savings
Side-by-Side Comparison
| Metric | Tennessee | Washington |
|---|---|---|
| Peak Sun Hours | 4.3 hrs | 3.5 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 | No Net Metering | Full Net Metering |
| Electricity Rate | 12.91¢/kWh | 11.26¢/kWh |
| Payback Period | 11.5 years | 12.5 years |
| 20-Year Savings | $26,400 | $22,800 |
Verdict
Tennessee is the better state for solar ROI with $26,400 in 20-year savings and a 11.5-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 Tennessee or Washington?
Tennessee gets more sun (4.3 peak hours/day vs 3.5). Tennessee has a faster payback (11.5 years) and Tennessee offers higher 20-year savings ($26,400).
How do solar costs compare between Tennessee and Washington?
A 6kW system costs $18,000 in Tennessee vs $18,600 in Washington before incentives. Both qualify for the 30% federal tax credit.
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Data verified March 2026 · Source: NREL, DSIRE, EIA