How Much Does Generator Installation Cost in St. Louis, MO?
A 22 kW whole-house generator costs $8,000 – $13,000 installed in St. Louis (close to the Missouri average). The primary outage risk is severe storms and tornadoes. Ameren Missouri serves the area with approximately 24 hours of outages per year.
Generator Installation Cost in St. Louis
| Setup | Size | Cost in St. Louis |
|---|---|---|
| Essential circuits | 10-16 kW | $5,000 – $9,000 |
| Whole house | 20-22 kW | $8,000 – $13,000 |
| Large home | 24-48 kW | $12,500 – $19,500 |
St. Louis faces severe thunderstorms, tornadoes, and ice storms. The July 2022 derecho was a wake-up call for the metro, causing widespread Ameren outages.
Not sure what size you need? Use our sizing guide or interactive calculator for a personalized recommendation. For the full national breakdown, see our installation cost guide.
St. Louis-Specific Installation Requirements
Local Code — St. Louis (Independent City) County
St. Louis City and County have separate jurisdictions. Standard electrical permits in both.
Permits
Permit cost: $75 – $225. Timeline: 1-2 weeks. Your installer handles filing and inspection.
Preferred Fuel: Natural Gas
Spire provides natural gas throughout the St. Louis metro.
See statewide Missouri costs and requirements for comparison.
Power Outage Risk in St. Louis
3
Outages/year
8h
Avg duration
Severe storms and tornadoes
Primary risk
Ameren Missouri
Local utility
A violent derecho hit St. Louis in July 2022 with 80+ mph straight-line winds, causing hundreds of thousands of Ameren outages.
Find Generator Installers in St. Louis
HomeGen connects you with certified installers in St. Louis and surrounding areas including Kansas City, Springfield and Columbia. Get 2-3 quotes to compare pricing — installation costs vary by up to $3,000 between contractors in the same city.
How Much Does a Home Generator Cost?
Get an instant estimate based on your home size and power needs.
Recommended size
22 kW
Estimated cost
$7,700 – $12,100
Includes equipment, installation, transfer switch, and permits
As low as $83/month with approved financing
Prices vary by location. Enter your ZIP code for local estimates.
FAQ — Generator Installation in St. Louis
How much does a generator cost in St. Louis?
A 22 kW generator costs $8,000-$13,000 installed. Competitive Midwest pricing.
How reliable is Ameren?
Ameren has faced criticism for storm restoration speed. The 2022 derecho left some areas without power for days.
Natural gas or propane?
Natural gas via Spire for most STL homes.
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