What's the difference between 100 amp and 200 amp service?

The main difference between 100 amp and 200 amp electrical service is the total amount of power your home can use simultaneously - 100 amp service provides about 24,000 watts while 200 amp service delivers 48,000 watts of available power.

Electrical Capacity and Modern Needs

A 100 amp service was standard for homes built before the 1980s and can handle basic electrical needs like lighting, standard appliances, and a central air conditioning unit. However, modern homes typically require significantly more power. With electric vehicle chargers (which need 40-50 amp circuits), hot tubs (30-50 amps), electric dryers (30 amps), electric ranges (40-50 amps), and multiple air conditioning units, a 100 amp panel quickly becomes inadequate.

The 200 amp service has become the standard for new construction and major renovations because it provides the capacity for modern electrical demands. This service can comfortably handle multiple high-draw appliances running simultaneously, plus leaves room for future additions like EV chargers, pool equipment, or workshop tools.

When You Need to Upgrade

You'll know it's time to upgrade from 100 to 200 amp service when breakers frequently trip, lights dim when major appliances start, or you're planning to add high-power equipment like an EV charger. In Ottawa, ESA requirements mandate that most panel upgrades need permits and inspections. Many insurance companies also require upgrades for older panels, especially Federal Pacific or Zinsco brands which are considered fire hazards.

Cost Considerations in Ottawa

A 100 amp to 200 amp upgrade typically costs $2,000 to $3,500 in the Ottawa market, including the new panel, meter base upgrade, ESA permits, and professional installation. This involves coordinating with Hydro Ottawa to disconnect and reconnect service, which licensed electricians handle as part of the upgrade process. The investment pays off through increased home value, improved safety, and the ability to add modern electrical features.

Safety and Code Compliance

Under the Ontario Electrical Safety Code, panel upgrades must be performed by ESA-licensed electricians and require inspection before the new service is energized. The upgrade also provides an opportunity to add modern safety features like AFCI (arc fault) protection and ensure all GFCI requirements are met throughout your home.

For a free assessment of whether your home needs a service upgrade, Electrical Ottawa's licensed electricians can evaluate your current electrical demands and future needs to recommend the right solution for your Ottawa home.

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Find a Licensed Electrician

Electrical Ottawa connects you with vetted, ESA-licensed electricians from the Ottawa Construction Network:Ottawa Electrical Contractors:

• Ring Electric Inc.
• Ottawa Electric
• Marcel Electric