In Iowa, a 7.5-kW system for an average home costs about $24,385 after incentives in 2026, saves about $1,503 in the first year and pays back in 13.7 years.
| Item | Amount |
|---|---|
| Solar, 7.48 kW × $3.26/W | $24,385 |
| Federal credit (0%) | $0 |
| Net cost | $24,385 |
| Scenario | Net cost | Year-1 savings | Payback | 25-yr net |
|---|---|---|---|---|
| State averages (above) | $24,385 | $1,503 | 13.7 yr | $27,142 |
| Rates rise 5.6%/yr (2020–25 pace) | $24,385 | $1,503 | 12.1 yr | $47,977 |
| Rates stay flat | $24,385 | $1,503 | 16.8 yr | $11,216 |
| Survey price $3.6/W (LBNL) | $26,928 | $1,503 | 14.9 yr | $24,599 |
| Add 13.5-kWh battery | $41,435 | $1,503 | 21.2 yr | $10,092 |
| Exports cut to 50% of retail | $17,213 | $747 | 18.4 yr | $8,252 |
Verdict: at average Iowa numbers, solar is a marginal investment in 2026 — payback takes 13.7 years, leaving you $27,142 ahead after 25 years. The main reasons: 1:1 net metering, which credits every exported kWh at the full retail price. Get at least three quotes: every $0.25/W you shave off the price moves payback by roughly a year or more here.
Net metering and exports in Iowa: Alliant kWh net metering; MidAmerican dollar bill credits, policy expected to be revised in 2027 (possible net billing).
Battery: a 13.5-kWh battery at the Iowa average of $1,263/kWh adds $17,051 and saves almost nothing extra under 1:1 net metering — buy it for backup, not payback; payback becomes 21.2 years.
EnergySage's Iowa page lists a 19.7-year payback. Its method is not fully published; ours uses EIA's Jan–Aug 2026 price, 1:1 net metering, 3%/yr rate growth and 0.5%/yr panel aging, with no federal credit.
The full method, material data and tips are on the main solar payback calculator page.