Electricity in St. Charles County, Missouri
2 electric utilities serve homes in St. Charles County, Missouri: Ameren Missouri and Cuivre River Electric Cooperative. In 2025, the average home bill of these utilities was $136.92 (Ameren Missouri) to $149.77 (Cuivre River Electric Cooperative) a month. This page covers 4 cities with 25,000 or more people in the county, from O'Fallon to Wentzville.
- 4 cities
- 2 utilities
- EIA and Census data, 2025
Electric utilities in St. Charles County
EIA lists utilities by county, not by address. Your address has one utility: its name is on your bill, or type your ZIP code in the utility finder.
| Utility | Homes in Missouri | Average bill 2025 | 1,000 kWh now |
|---|---|---|---|
| Ameren MissouriInvestor-owned utility · bill calculator | 1,100,654 | $136.921,032 kWh, 13.3¢ | $116.50 |
| Cuivre River Electric CooperativeElectric cooperative | 74,261 | $149.771,318 kWh, 11.4¢ | — |
The average bill is the 2025 average of each utility's homes that bought their power from it (EIA-861). The Missouri average was $137.97 a month.
Cities in St. Charles County
| City | People | City-owned utility | Solar kWh a year per kW |
|---|---|---|---|
| O'Fallon | 96,101 | — | 1,408 |
| St. Charles | 72,561 | — | 1,398 |
| St. Peters | 61,479 | — | 1,420 |
| Wentzville | 49,495 | — | 1,413 |
A city-owned utility is a municipal utility in the county with the city's name (EIA data). Solar output: PVWatts version 8 for a south-facing roof; see the solar savings calculator.
More about Missouri: Missouri electric rates, all Missouri utilities, home energy rebates and natural gas bills.
Who provides electricity in St. Charles County?
2 electric utilities serve homes in St. The name of your utility is on your bill.
Which cities in St. Charles County are on this page?
O'Fallon, St. Charles, St. Peters and Wentzville.
Sources: EIA-861 data, 2025 (utilities by county, homes and average bills); Census Bureau city population estimates, Vintage 2025; PVWatts (National Laboratory of the Rockies).