Solar Panel Cost in St Louis, MO
Updated 2026 guide to solar panel prices, savings, and payback period in St Louis.
Estimated Solar Savings
Solar Panel System Costs in St Louis, MO
Below are estimated costs for different solar panel system sizes in St Louis, including the 30% federal solar tax credit.
| System Size | Cost Before Incentives | Federal Tax Credit (30%) | Net Cost | Est. Annual Production |
|---|---|---|---|---|
| 4 kW | $11,400 | -$3,420 | $7,980 | 6,278 kWh |
| 6 kWMost Popular | $17,100 | -$5,130 | $11,970 | 9,417 kWh |
| 8 kW | $22,800 | -$6,840 | $15,960 | 12,556 kWh |
| 10 kW | $28,500 | -$8,550 | $19,950 | 15,695 kWh |
| 12 kW | $34,200 | -$10,260 | $23,940 | 18,834 kWh |
What Affects Solar Panel Cost in St Louis?
The average cost of solar panels in St Louis, MO is approximately $285/watt before incentives. For a typical 6kW residential system, that means a total cost of about $17,100 before the federal tax credit.
After applying the 30% federal Investment Tax Credit (ITC), your net cost drops to approximately $11,970.St Louis homeowners typically see a payback period of 9 years and save an estimated $27,000 over 25 years.
Factors that affect your cost in St Louis:
- System size: Larger systems cost more but have a lower cost per watt
- Equipment quality: Premium panels and inverters cost more but offer better efficiency
- Roof complexity: Steep roofs, multiple levels, or shading can increase installation costs
- Local labor rates: Installation costs vary within the St Louis metro area
- Local permits: Permitting costs and requirements vary by municipality in St Louis
- Incentives: State and local programs can significantly reduce your out-of-pocket cost
Solar Incentives Available in St Louis
Federal Solar Investment Tax Credit
30% Federal Tax Credit (ITC)
Missouri homeowners can take advantage of the 30% federal ITC along with utility-specific rebate programs.
State & Local Incentives
Ameren Missouri Solar Rebate
RebateAmeren Missouri offers rebates for residential solar installations in their service territory.
Property Tax Exemption
Property TaxMissouri exempts solar energy systems from real property tax assessments.
Net Metering
Missouri requires investor-owned utilities to offer net metering for systems up to 100 kW. Customers receive credits at the retail rate.
AvailableSRECs
Missouri's Renewable Energy Standard includes a solar carve-out, but the state does not have an active SREC trading market for residential customers.
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Solar Panel Cost FAQ - St Louis, MO
The average cost of solar panels in St Louis is approximately $2.85 per watt before incentives. A typical 6kW residential system costs about $17,100 before the 30% federal tax credit, bringing the net cost to around $11,970.
The typical payback period for solar panels in St Louis is approximately 9 years. After that, you'll enjoy free electricity for the remaining 15-20+ years of your system's life, saving an estimated $27,000 over 25 years.
St Louis homeowners can take advantage of the 30% federal solar tax credit, which reduces your system cost by 30%. Missouri also offers net metering, and various state-level incentive programs. Check our incentives page for the complete list.
St Louis homeowners can save an estimated $27,000 over 25 years by going solar. Actual savings depend on your electricity usage, system size, roof orientation, and available incentives. With electricity rates averaging $0.12/kWh in Missouri, solar provides significant long-term savings.
Solar Costs in Other Missouri Cities
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