Electrical Service Upgrades in O'Fallon, MO
Your panel can only use the power your service delivers. We upgrade the whole service entrance, from the weatherhead and mast to the meter base and main disconnect, to 200 or 400 amps, and coordinate the disconnect and reconnect with your utility. We serve all of O'Fallon, from Fort Zumwalt Park to the neighborhoods toward St. Peters.
O'Fallon homes
O'Fallon's newer subdivisions mostly have 200-amp service, while homes in the older neighborhoods closer to downtown can still be on 100 or 150 amps with their original panels.
Permits and utility
- Permit: pulled with St. Charles County or the City of O'Fallon, whichever has jurisdiction, and inspected before we finish.
- Utility: Ameren Missouri or Cuivre River Electric Cooperative, depending on your address. We schedule any disconnect, reconnect or meter work.
- ZIP codes: 63366, 63368, 63376
What it costs in O'Fallon
Meter Base Replacement
$1,200–$2,500
- New 200A meter base
- Service entrance connections
- Permit and inspection
- All utility coordination
When the panel is already 200A but the meter base needs replacement
200A Service + Panel Upgrade
$2,500–$4,500 plus $1,200–$2,500 for the meter base
- New 200A panel and main breaker
- New 200A meter base and weatherhead
- Service entrance conductors
- Permit, inspection and utility reconnection
The most common upgrade from 100-amp service
400A Service Installation
$8,000–$15,000
- 400A meter base and CT cabinet
- Dual 200A panels or a 400A-rated panel
- Heavy service entrance conductors
- Utility coordination for 400A supply
Large homes with all-electric systems, shops, pools
Typical ranges. Your written quote follows a free on-site assessment.
How the job goes
Load Assessment
We inspect your meter base, mast, service conductors, panel and grounding, then calculate your load, including anything you plan to add, so the new service is sized right the first time.
Written Quote
You get an itemized quote: meter base, conductors, mast or weatherhead work, panel work if needed, permit and utility coordination.
Permit & Utility Scheduling
We pull the permit and schedule the disconnect and reconnect with your utility, Ameren Missouri or, in parts of St. Charles County, Cuivre River Electric Cooperative.
Installation
With the power off, we replace the service entrance equipment and terminate it at the panel. Most services are completed in one day.
Inspection & Reconnect
After the inspection passes, the utility sets the meter and restores power. We test every circuit before we leave.
Electrical Service Upgrades questions from O'Fallon
Do you handle the permit for electrical service upgrades in O'Fallon?
Yes. We pull the permit with the office that has jurisdiction at your address, St. Charles County or the City of O'Fallon, and schedule the inspection. The permit is included in our quote.
Who is the utility for O'Fallon homes?
O'Fallon is served by Ameren Missouri or Cuivre River Electric Cooperative, depending on your address. When the work needs the power disconnected or a meter changed, we coordinate it with the utility for you.
Which parts of O'Fallon do you serve?
All of O'Fallon (63366, 63368, 63376) and the surrounding area, including St. Peters, Lake St. Louis, Wentzville, Dardenne Prairie.
What is the difference between a service upgrade and a panel upgrade?
The panel distributes power to your circuits. The service is everything that brings power to the panel: the weatherhead, mast, service entrance conductors and meter base. Going from 100 to 200 amps usually means upgrading both.
Do I need a new meter base?
Often, yes. A 100-amp meter base can't support 200-amp service. If yours is undersized, damaged or doesn't meet current utility requirements, replacement is part of the quote.
Will the utility replace my meter?
Yes. The utility provides and installs the meter after we complete the meter base upgrade and pass inspection.
Can I upgrade to 400-amp service?
Yes, for large homes with high demand: all-electric systems, multiple EV chargers, pools, workshops. We confirm with your utility that 400A supply is available at your address.
More from First Choice Electric
See everything about electrical service upgrades, or all our electrical services in O'Fallon.
Electrical Service Upgrades nearby: St. Charles, St. Peters, Chesterfield, Kirkwood, Webster Groves