Solar Panel Installation Cost in St Louis, MO

How much do solar panels cost in St Louis, MO? Compare solar panel installation costs, state rebates, heat pump incentives & local utility programs. Find solar panels for your home with our free calculator.

Last updated: April 1, 2026

Avg System Cost

$12,746

Net After Incentives

$12,746

Solar Panel Cost & Savings in St Louis

Average System Cost

$12,746

$2.55/W (median: $2.50/W)

St Louis Savings Breakdown

Item	Amount
Average System Cost	$12,746
Estimated Net Cost	$12,746

Price range:$10,834

$14,658

Data sourced from EnergySage & Rewiring America APIs. Incentive values are estimates based on a representative homeowner profile. Run the calculator for a personalised breakdown.

Solar Panel Installers in St Louis

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Solar Energy in St Louis, MO: Complete Guide

St. Louis is served by Ameren Missouri. The solar resource is about 4.5 to 4.9 peak sun hours per day, decent for the Midwest. Ameren Missouri rates run about $0.11 to $0.14 per kWh, which is on the lower side nationally.

Missouri's net metering law (RSMo 386.890) provides retail rate credits for excess generation. The state has a property tax exemption for solar. But there is no state solar tax credit, and the federal ITC expired December 2025. The economics in St. Louis are moderate: positive returns over the system's life, but payback periods on the longer side.

Solar Potential in St Louis

St. Louis averages 4.5 to 4.9 peak sun hours per day. A 7 kW system produces about 8,800 to 10,500 kWh per year. Hot, humid summers and moderate winters with about 16 inches of snow annually.

Local Solar Incentives & Rebates in St Louis

St. Louis solar incentives:

Ameren Missouri: • Net metering at retail rate under RSMo 386.890 • Rates approximately $0.11 to $0.14 per kWh • Ameren has offered a Solar Rebate program in the past. Check current availability

Missouri state: • Property tax exemption: RSMo 137.100 exempts solar from property assessment • No state solar income tax credit • Sales tax applies to solar equipment (about 9.7% combined in St. Louis City)

Federal: 30% ITC expired December 2025.

Solar Installation Tips for St Louis Homeowners

St. Louis installation notes: Permits go through St. Louis City or St. Louis County depending on your location. Straight Up Solar is a well known local installer. Get at least 3 quotes.

Frequently Asked Questions About Solar in St Louis

How much does solar cost in St. Louis?

Expect $2.50 to $2.85 per watt. A 7 kW system costs about $17,500 to $19,950 before sales tax. Missouri charges about 9.7% sales tax in St. Louis City. No state solar tax credit. The federal ITC expired December 2025.

Is solar worth it in St. Louis?

For homes with bills above $120, the payback is 13 to 17 years on a 25 to 30 year system. The returns are positive but payback is slower than in high rate states. Ameren's net metering and the property tax exemption are the main benefits.

Does Ameren Missouri support net metering?

Yes. Missouri law requires net metering at retail rate for residential solar. Ameren has also offered solar rebates in the past through separate programs. Check their current offerings.

Reviewed by the Net-Zero USA editorial team

Last reviewed: April 1, 2026

Sources: Ameren Missouri tariff, RSMo 386.890, RSMo 137.100, St. Louis City/County permitting, NREL PVWatts, EIA