Solar Panel Cost in St. Louis, MO (2026)
Solar panel costs in St. Louis, MO typically run below the Missouri state average. A 6 kW system in St. Louis costs about $14,250 before the 30% federal ITC, with payback around 9.5 years at local utility rates.
Quick answer
In St. Louis, a 6 kW solar panel system costs about $14,250 installed (9.5-year payback). After the 30% federal tax credit, net cost is roughly $9,950. Annual savings: ~$1,070/year at 12.5¢/kWh.
Free quote comparison
Compare solar quotes in St. Louis
Free — compare pre-screened local installers. No obligation.
MySunROI may earn a fee if you request quotes through partner links. See our disclaimer.
Solar Panel Cost Calculator
Instant estimate with Solar Score™ — unique to MySunROI
Estimate for Missouri
$6,800net after 30% ITC
~4 kW · 10 panels · $9,700 before credits · 12.5¢/kWh
Annual savings
$714
Payback
9.5 yrs
25-year savings
$18,740
25-year savings timeline
Includes ~3% utility rate growth & 0.5%/yr panel degradation
St. Louis vs US Average
| Metric | MO | US avg |
|---|---|---|
| 6 kW system (before credit) | $14,250 | $16,271 |
| Net cost after 30% ITC | $9,950 | $11,390 |
| Cost per watt | $0.00/W | — |
| Annual electricity savings | $1,070 | $1,335 |
| Payback period (years) | 9.5 yrs | 9 yrs |
| Electricity rate | 12.5¢/kWh | — |
Updated 2026-07-07. Estimates only.
What affects solar costs in St. Louis?
St. Louis metro solar pricing runs 5–10% below the Missouri state average, reflecting local labor, permitting, and installer competition. Solar installation costs in Missouri reflect local labor rates, permit fees, and utility interconnection rules. A typical 6 kW system runs $11,330–$20,020 before the 30% federal tax credit, with net cost around $7,930–$14,010.
St. Louis homeowners should compare at least three local quotes specifying panel brand, inverter type, and production guarantee. Missouri averages 12.5¢/kWh and 4.6 peak sun hours per day — moderate solar production potential for rooftop systems.
Utility rules in Missouri affect how solar credits apply to your bill — verify net metering or buyback terms for your specific provider serving St. Louis.
St. Louis solar ROI depends on Missouri electricity rates, local install competition, and roof suitability. Missouri install costs average $2.42/W with estimated 9.5-year payback on a 6 kW system — below US national averages.
St. Louis solar snapshot
- 6 kW system: $11,100 – $19,600
- After 30% ITC: $9,950
- Electric rate: 12.5¢/kWh · Peak sun: 4.6 hrs/day
- Payback: ~9.5 years · Annual savings: ~$1,070
How to maximize solar ROI in St. Louis
- Compare St. Louis installer quotes on cost per watt ($/W)
- Check Missouri incentives — state guide
- Review how to choose installers in Missouri
- Compare at least three installer quotes in Missouri
- Model payback using your actual utility rate and usage
Frequently Asked Questions
How much do solar panels cost in St. Louis?
A 6 kW solar system in St. Louis, MO typically costs $11,100–$19,600 before incentives, or $9,950 after the 30% federal tax credit.
Is solar worth it in St. Louis?
With 12.5¢/kWh electricity rates and 4.6 peak sun hours, St. Louis homeowners often see 9.5-year payback. Use our calculator for your roof and usage.
How does St. Louis compare to Missouri?
St. Louis install pricing is among the more affordable metros in Missouri.
Related pages
How We Calculate Solar Costs
MySunROI estimates combine NREL residential PV installed-price benchmarks, EIA state electricity rates, and regional labor modifiers — updated 2026-07-07.
Estimates only. Last updated 2026-07-07. Estimates based on NREL PV cost benchmarks, EIA electricity rates, and 2026 installer pricing surveys.