In Oklahoma, a 8.8-kW system for an average home costs about $22,792 after incentives in 2026, saves about $1,763 in the first year and pays back in 11.1 years.
| Item | Amount |
|---|---|
| Solar, 8.8 kW × $2.59/W | $22,792 |
| Federal credit (0%) | $0 |
| Net cost | $22,792 |
| Scenario | Net cost | Year-1 savings | Payback | 25-yr net |
|---|---|---|---|---|
| State averages (above) | $22,792 | $1,763 | 11.1 yr | $38,918 |
| Rates rise 5.6%/yr (2020–25 pace) | $22,792 | $1,763 | 10 yr | $63,933 |
| Rates stay flat | $22,792 | $1,763 | 13 yr | $19,798 |
| Survey price $3.6/W (LBNL) | $31,680 | $1,763 | 14.7 yr | $30,030 |
| Add 13.5-kWh battery | $43,380 | $1,763 | 19.1 yr | $18,330 |
| Exports cut to 50% of retail | $15,954 | $890 | 15 yr | $14,375 |
Verdict: at average Oklahoma numbers, solar is a solid investment in 2026 — payback takes 11.1 years, leaving you $38,918 ahead after 25 years. The main reasons: cheap power (the 9th-lowest price of 51), which caps what each kWh saves; 1:1 net metering, which credits every exported kWh at the full retail price. Pay cash if you can: Berkeley Lab found loan-financed systems priced about $1.50/W above cash installs in 2025, which can add years to the payback.
Net metering and exports in Oklahoma: OG&E/PSO net metering with excess credited at avoided cost; co-ops/munis not required.
Battery: a 13.5-kWh battery at the Oklahoma average of $1,525/kWh adds $20,588 and saves almost nothing extra under 1:1 net metering — buy it for backup, not payback; payback becomes 19.1 years.
EnergySage's Oklahoma page lists a 16.3-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.