What's the best generator fuel type for Calgary — natural gas or propane?

Natural gas is the clear winner for most Calgary homeowners because the city has extensive natural gas infrastructure, fuel costs are significantly lower than propane, and you never need to worry about refuelling during a prolonged winter outage. That said, propane has specific advantages for rural properties and acreages outside Calgary's gas service area.

Natural gas advantages in Calgary are substantial. Nearly every home within Calgary city limits and most homes in surrounding communities like Airdrie, Cochrane, Okotoks, and Chestermere are connected to the natural gas grid. This means an unlimited fuel supply during an outage — your generator will run as long as the gas lines remain pressurized, which they almost always do even during electrical outages because the gas distribution system operates on pipeline pressure rather than electric pumps at the local level. Fuel cost during an outage is roughly $2 to $5 per hour depending on generator load, which is significantly cheaper than propane. There are no fuel storage tanks to maintain, no deliveries to schedule, and no risk of running out during a multi-day outage — which is a real concern with propane when roads are impassable in a Calgary blizzard.

The gas line connection from your existing gas supply to the generator typically costs $500 to $1,500 and requires a licensed gas fitter plus a gas permit. Your gas fitter will size the line based on the generator's BTU demand plus your home's existing gas loads (furnace, water heater, range, fireplace, dryer). In some cases, the existing gas meter or supply line may need to be upsized to handle the additional demand, which ATCO Gas or your local gas utility coordinates.

Propane makes sense in specific situations. If your property is outside the natural gas service area — common for acreages in Rocky View County, Foothills County, or properties west toward Canmore — propane is your primary option. Propane generators also produce slightly more power per unit of fuel than natural gas, meaning a dual-fuel generator running on propane produces about 10 percent more output than the same unit running on natural gas. A 500-gallon propane tank provides roughly 3 to 5 days of continuous runtime for a 22kW generator at moderate load, but a severe winter storm that blocks roads could delay refuelling.

Propane costs are higher both for fuel and infrastructure. A 500-gallon propane tank (leased or purchased) plus installation runs $1,500 to $3,500. Propane fuel costs roughly $4 to $8 per hour of generator operation at moderate load. You also need to monitor tank levels and schedule regular deliveries, and propane prices in Alberta fluctuate more than natural gas.

Dual-fuel generators are available from Generac and other manufacturers, allowing the unit to run on either natural gas or propane. These are popular for properties that have natural gas now but want the flexibility of propane backup, or for homeowners who plan to move to a rural property eventually. The dual-fuel option typically adds $500 to $1,000 to the generator cost.

One Calgary-specific consideration is cold weather performance. Both natural gas and propane generators operate reliably in Calgary's extreme cold, but propane tanks can experience reduced pressure at very low temperatures (below -30 degrees Celsius) because propane's vaporization rate decreases in extreme cold. This is less of an issue with larger tanks that maintain adequate vapour pressure, but undersized tanks can struggle in a deep freeze. Natural gas supply pressure remains consistent regardless of temperature. For most Calgary homeowners connected to the gas grid, natural gas is the clear recommendation. A licensed electrician and gas fitter can assess your specific situation and recommend the right fuel type for your property.