Solar Panel Calculator for Oklahoma City, OK
Estimate the cost, savings and payback of solar panels in Oklahoma City, OK, using local NREL sunshine data, Oklahoma prices and electricity rates.
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Oklahoma City gets about 5.55 peak sun hours a day on a south-facing roof, so each kW of panels makes about 1,554 kWh a year. That ranks #30 of the 111 cities on this site. Output peaks in Jul and is lowest in Dec.
Sunshine in Oklahoma City by month
What an 8 kW system makes in Oklahoma City
| Month | Sun hours a day | Output | Bill savings |
|---|---|---|---|
| Jan | 3.95 | 816 kWh | $113 |
| Feb | 4.92 | 904 kWh | $125 |
| Mar | 5.11 | 1,000 kWh | $138 |
| Apr | 6.34 | 1,176 kWh | $162 |
| May | 6.22 | 1,168 kWh | $161 |
| Jun | 6.93 | 1,216 kWh | $168 |
| Jul | 7.00 | 1,248 kWh | $172 |
| Aug | 6.89 | 1,232 kWh | $170 |
| Sep | 5.96 | 1,056 kWh | $146 |
| Oct | 5.14 | 1,000 kWh | $138 |
| Nov | 4.24 | 816 kWh | $113 |
| Dec | 3.91 | 808 kWh | $112 |
| Year | 5.55 | 12,432 kWh | $1,717 |
Savings at 13.81¢ per kWh (Oklahoma average), with every kWh credited at that price.
Cost and payback by system size
At $2.57 per watt, the Oklahoma average, before incentives.
| System | Cost | Year 1 savings | Payback | 25-yr gain |
|---|---|---|---|---|
| 4 kW | $10,280 | $858 | 12.3 yrs | $9,941 |
| 6 kW | $15,420 | $1,288 | 12.3 yrs | $14,912 |
| 8 kW | $20,560 | $1,717 | 12.3 yrs | $19,882 |
| 10 kW | $25,700 | $2,146 | 12.3 yrs | $24,853 |
| 12 kW | $30,840 | $2,575 | 12.3 yrs | $29,823 |
How many panels you need in Oklahoma City
| Monthly use | System | 400 W panels |
|---|---|---|
| 500 kWh | 3.86 kW | 10 |
| 750 kWh | 5.79 kW | 15 |
| 1,000 kWh | 7.72 kW | 20 |
| 1,500 kWh | 11.58 kW | 29 |
| 2,000 kWh | 15.44 kW | 39 |
Covering 100% of a year's use at 1,554 kWh per kW.
Common questions
Is solar worth it in Oklahoma City?
At local averages an 8 kW system costs about $20,560 before incentives, saves about $1,717 in its first year and pays back in about 12.3 years.
How many peak sun hours does Oklahoma City get?
About 5.55 a day over the year on a south-facing roof at 20°, from 3.9 in Dec to 7.0 in Jul, according to NREL's PVWatts model.
How much does a 1 kW solar system produce in Oklahoma City?
About 1,554 kWh a year, or 130 kWh a month on average.
Is there a federal solar tax credit?
Not for homeowners who buy their system. The 30% Residential Clean Energy Credit ended for systems installed after December 31, 2025.
Sources
- NREL PVWatts V8 API (south-facing, 20° tilt, 14% losses, typical-year weather): https://developer.nlr.gov/docs/solar/pvwatts/v8/
- EnergySage, Solar panel cost by state (updated November 6, 2026): https://www.energysage.com/local-data/solar-panel-cost/
- U.S. EIA, Electric Power Monthly, Table 5.6.B (residential price, Jan–Aug 2026): https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_b