The 100 amp vs 200 amp panel decision comes down to your home’s size, age, and electrical load. Most Calgary homes built before 2000 have 100-amp service, which is undersized for today’s appliances. If you have central air conditioning, an EV charger, a finished basement, or plan to add any of these, a 200-amp panel is the right choice.
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Your electrical panel controls every circuit in your home. Choose the right size and you’ll have reliable power with room to grow. Choose the wrong size and you’ll face tripping breakers, limited renovation options, and the cost of upgrading again in a few years.
At Ampt Over Electric, we help Calgary homeowners make this decision every day. Here’s everything you need to know about 100 amp vs 200 amp panels — in plain language, with real Calgary pricing and code requirements.
What Is a 100-Amp Electrical Panel?
A 100-amp panel is a load centre rated to deliver a maximum of 100 amperes of electrical current to your home. At 240 volts, that’s 24,000 watts of total available power. It typically has 20 to 24 circuit breaker slots and can support 12 to 16 individual circuits.
In Calgary, most homes built between the 1960s and early 1990s were wired with 100-amp service. At the time, this was adequate. The average Calgary home of that era had a furnace, a range, a refrigerator, and basic lighting. Total electrical load was manageable within 100 amps.
Today, the same home might run a central air conditioner, a chest freezer, a home office with multiple computers, a washer and dryer, and a Level 2 EV charger — all drawing power at the same time. A 100-amp panel was never designed for that load.
What Is a 200-Amp Electrical Panel?
A 200-amp panel is rated to deliver up to 200 amperes — 48,000 watts at 240 volts. It typically has 40 to 42 circuit breaker slots and can support 20 to 30 individual circuits or more, depending on how double-pole breakers are used.
A 200-amp service gives your Calgary home the capacity it needs for modern electrical loads. It also provides headroom for future growth: an EV charger, a hot tub, a heat pump, or a basement suite can all be added without immediately maxing out your panel.
According to the Canadian Electrical Code (CEC), Part 1, Section 8, new residential construction must provide a minimum service size based on the calculated load of the home. For most new Calgary homes, this calculation results in a 200-amp service requirement. The Alberta Electrical Code follows the CEC as its base standard.
100 Amp vs 200 Amp Panel: Key Differences
| Feature | 100-Amp Panel | 200-Amp Panel |
|---|---|---|
| Total capacity | 24,000 watts | 48,000 watts |
| Typical circuit slots | 20–24 | 40–42 |
| Supports central A/C | Often marginal | Yes, comfortably |
| Supports EV charger (Level 2) | Often not feasible | Yes |
| Supports basement suite | Rarely | Yes |
| Future-proof for Calgary homes | No | Yes |
| Upgrade cost in Calgary | $1,500–$2,800 (from 60A) | $2,000–$4,500 |
| Meets current Alberta code for new builds | Minimum, may not meet calculated load | Yes |
When Is a 100-Amp Panel Sufficient?
A 100-amp panel may be sufficient for your Calgary home if it meets all of the following criteria. Your home is smaller than 1,200 square feet. You have no central air conditioning (window units only). You don’t charge an electric vehicle at home. You have no plans for a basement development or major renovation. Your total electrical load — calculated by a licensed electrician — stays within 80% of the panel’s capacity (80 amps continuous).
This describes a small, older Calgary home with modest electrical needs. If that’s your situation, a 100-amp panel may carry you a few more years. However, if any of those conditions change, you’ll need to upgrade. And upgrading twice costs more than upgrading once to 200 amps.
It’s also worth noting that some Calgary home insurers are becoming more cautious about older 100-amp panels, especially if the panel is 25 or more years old. An older panel, regardless of its amperage rating, may need replacement on safety grounds alone. For more on those warning signs, see our guide to 7 signs you need an electrical panel upgrade in Calgary.
When You Need a 200-Amp Panel
Most Calgary homeowners asking about 100 amp vs 200 amp panels are in a situation where 200 amps is clearly the right choice. Here are the most common scenarios where upgrading to 200-amp service makes sense.
Your home is larger than 1,500 square feet. Central air conditioning, electric heat, or a heat pump is installed or planned. You want to install a Level 2 EV charger — which draws 40–50 amps on its own. You’re developing a basement or adding a suite. You’re planning a kitchen renovation with new high-draw appliances. Your current panel is at or near its breaker capacity, with no room to add circuits.
According to Natural Resources Canada‘s Survey of Household Energy Use, Canadian households have seen steady growth in electricity consumption per home, driven largely by electronics, climate control, and electric vehicle charging. A 200-amp service positions your Calgary home for that growth rather than fighting against it.
Ampt Over Electric recommends 200-amp service for virtually every Calgary home seeking a panel upgrade today. The cost difference between a 100-amp and 200-amp panel upgrade is relatively small — typically $300 to $700 more for the 200-amp option — but the capacity difference is enormous. When you’re already paying for labour and an ENMAX disconnection, upgrading fully makes sense. See our full electrical panel upgrade service page for details.
Cost Comparison: 100 Amp vs 200 Amp Panel Upgrade in Calgary
Pricing depends on your starting point — whether you’re upgrading from 60-amp, staying at 100-amp with a new panel, or going to 200-amp service.
Upgrading from a 60-amp fuse panel to a new 100-amp breaker panel in Calgary typically costs $1,500–$2,800. Upgrading from a 60-amp or 100-amp panel to a 200-amp panel typically costs $2,000–$4,500. The higher end applies when the service entrance wiring also needs replacing — common in older Calgary homes where the original wiring runs from the ENMAX meter are undersized for 200-amp service.
All panel upgrade work in Calgary requires a City of Calgary electrical permit ($150–$300), a licensed electrician, an ENMAX service disconnection and reconnection, and a City inspection before power is restored. Ampt Over Electric includes permits and ENMAX coordination in our quotes — there are no hidden fees. For a detailed breakdown, see our 200 amp panel upgrade cost guide.
Alberta Electrical Code Requirements for Panel Size
The Alberta Electrical Code (based on the Canadian Electrical Code, CEC Part 1) requires that your electrical service be sized to handle the calculated demand load of your home. This is not simply a matter of picking 100 amps or 200 amps — a licensed electrician must perform a load calculation based on your home’s square footage, heating system, air conditioning, and connected appliances.
For most Calgary homes over 1,200 square feet with electric cooking, air conditioning, or an EV charger, the load calculation will point to 200-amp service. The City of Calgary requires a permit for all service upgrades, and the work must be inspected by a City electrical inspector before power is restored.
ENMAX, Calgary’s electricity distributor, must also coordinate the service disconnection and reconnection. A licensed Calgary electrician handles this coordination directly — homeowners don’t need to contact ENMAX separately. Ampt Over Electric manages the entire process, including permits, ENMAX coordination, and inspection scheduling.
Key Takeaways
- A 100-amp panel provides 24,000 watts — adequate for small, older Calgary homes with modest loads.
- A 200-amp panel provides 48,000 watts and is the current standard for Calgary residential service.
- EV chargers, central A/C, and basement developments almost always require 200-amp service.
- The cost difference between 100-amp and 200-amp upgrades is relatively small — usually $300–$700.
- All panel upgrades in Calgary require a permit, licensed electrician, ENMAX coordination, and City inspection.
- The Alberta Electrical Code requires service sizing based on a load calculation, not a fixed rule.
Frequently Asked Questions
Is 100-amp service enough for a Calgary home?
It depends on your home’s size and electrical load. Small homes under 1,200 square feet with no central A/C, EV charger, or basement suite may manage with 100 amps. Larger homes, or any home adding major electrical loads, will need 200-amp service. A licensed Calgary electrician can perform a load calculation to give you a definitive answer.
How much does it cost to upgrade from 100 amp to 200 amp in Calgary?
Upgrading from a 100-amp panel to a 200-amp panel in Calgary typically costs $2,000–$4,500, including labour, materials, City of Calgary permit, and ENMAX coordination. Most Calgary homeowners pay around $2,800–$3,200 for a straightforward upgrade. See our full cost breakdown for detail.
Can I run an EV charger on a 100-amp panel?
It depends on your panel’s available capacity. A Level 2 EV charger requires a dedicated 40–50 amp circuit. If your 100-amp panel is already serving a typical Calgary home’s loads, there may not be enough headroom. In most cases, a 200-amp upgrade is the right approach before adding an EV charger. Your Ampt Over Electric electrician will assess your panel’s current load before recommending a path forward.
Do I need a permit to upgrade my electrical panel in Calgary?
Yes. All electrical panel upgrades in Calgary require a City of Calgary permit and a final electrical inspection. ENMAX must also coordinate the power disconnection. Ampt Over Electric handles all permits and ENMAX coordination on your behalf. Never hire an electrician who suggests skipping the permit — it creates serious problems with insurance and property sales.
What are the signs my panel needs upgrading?
Frequent breaker trips, flickering lights, a burning smell near the panel, and a panel older than 25 years are all warning signs. For the full list, see our guide to 7 signs you need an electrical panel upgrade in Calgary.
Ready to Upgrade Your Calgary Electrical Panel?
Choosing between 100 amp vs 200 amp service doesn’t have to be complicated. Our licensed Calgary electricians will assess your current panel, calculate your home’s load, and give you a clear recommendation — with honest pricing and no pressure.
Call us today: 1 (368) 993-7463
Available Monday to Sunday, 7am–8pm.
Or book your panel upgrade assessment online.
Ampt Over Electric
15 Everhollow Heath SW
Calgary, AB T2Y 4R7
Phone: 1 (368) 993-7463
Hours: Mon–Sun, 7am–8pm
Related Reading
- 7 Signs You Need an Electrical Panel Upgrade in Calgary
- 200 Amp Panel Upgrade Cost in Calgary: Complete Pricing Guide
Written by the Ampt Over Electric Team — Licensed Calgary electricians with 16+ years of local experience.
