Generator Installation in St. Louis, MO
Ameren customers averaged 2.5 hours without power in 2024 — far below the US average of 11 hours. Sustained outages are rarer here than in most of the country, but storm and equipment-driven interruptions still happen — and homeowners with medical equipment, a home office, a well pump or a sump pump often want backup regardless of the average. Below are generator installers serving St. Louis and the rest of St. Louis, ranked by reputation.
How often the power actually goes out in St. Louis
2024 · EIA data2.5 hours
average time a Ameren customer spent without power
22%
of the US average of 11 hours — better than typical
0.8
power interruptions per customer that year
Excluding major event days — hurricanes, ice storms and the like — the figure drops to 94 minutes. The gap between the two is the part a standby generator or home battery is really for.
Source: US Energy Information Administration, Form 861 reliability filing for Union Electric Co - (MO) (IEEE 1366 methodology). SAIDI measures the average minutes a customer was without power across the year. National reliability in 2024 was heavily affected by Hurricanes Beryl, Helene and Milton.
94
GridFree Score
★★★★ 4.9 · 4997
94
GridFree Score
★★★★ 4.9 · 671
94
GridFree Score
★★★★ 4.9 · 684
93
GridFree Score
★★★★ 4.8 · 1414
5.Generator Supercenter of St. Louis
EliteElectric generator shop
91
GridFree Score
★★★★★ 5 · 177
89
GridFree Score
★★★★ 4.9 · 135
7.Commercial Electric Motor Service Inc.
Top ratedElectric motor store
87
GridFree Score
★★★★ 4.8 · 132
77
GridFree Score
★★★★ 4.1 · 65
77
GridFree Score
★★★★ 4.8 · 10
76
GridFree Score
★★★★ 4 · 84
67
GridFree Score
★★★ 3.3 · 66
12.Generator Solutions
Electric generator shop
54
GridFree Score
★★★ 3.8 · 10
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Get listed →Frequently asked questions
How much does generator installation cost in St. Louis?
In St. Louis, a whole-house standby generator (18–26 kW) typically runs $10,000–$20,000 installed, including the transfer switch, gas connection, pad and permits. A smaller essentials-only unit (10–14 kW) runs $8,000–$13,000. A portable generator with an interlock kit is the budget option at $800–$2,000.
Do I need a permit for a generator in St. Louis, MO?
Almost everywhere, yes. A standby generator needs an electrical permit and usually a gas/plumbing permit, and most states require the work be done by a licensed contractor. A reputable St. Louis installer pulls the permit for you — treat anyone who offers to skip it as a red flag, since unpermitted work surfaces at resale and can void insurance claims.
Who installs generators in St. Louis?
Licensed electricians and specialized generator dealers handle installation. A standby generator also needs a gas connection, so many jobs involve both an electrician and a plumbing contractor — dealers coordinate both.
Why are outages common around St. Louis?
Ameren customers averaged 2.5 hours without power in 2024 — far below the US average of 11 hours. Sustained outages are rarer here than in most of the country, but storm and equipment-driven interruptions still happen — and homeowners with medical equipment, a home office, a well pump or a sump pump often want backup regardless of the average.
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