The short version: Alberta sells natural gas in gigajoules (GJ). One GJ is a unit of energy — enough to heat your home for roughly 4 to 8 hours on a cold January day, or to bring about 2,000 litres of cold water to boiling. Bills show both GJ and cubic metres; GJ is the headline number, with about 26.8 cubic metres equalling one GJ.

The mistake that makes comparison hard

Marketing pages sometimes quote prices in cents per cubic metre to make the number look smaller. "12 cents per cubic metre" sounds cheaper than "$3.20 per GJ", but they describe roughly the same price. Confirm everything is in $/GJ for apples-to-apples comparison. Alberta\'s regulated tariffs and most retailer contracts are in $/GJ; cubic-metre quotes are usually a marketing recasting.

What a GJ actually buys you

Heating

About 4 to 8 hours of furnace operation in a cold Alberta January, depending on home size and insulation.

Water heating

Roughly 2,000 to 2,500 litres of cold water raised to boiling, or a few weeks of typical hot-water tank use for an average household.

Cooking

Months of gas-stove cooking for a typical household. Cooking is a small share of gas use compared to heating.

Dryers

Many loads of laundry in a gas dryer. Gas dryers run cheaper and faster than electric resistance dryers per load.

Tool: GJ to cubic metres, plus monthly bill estimator

Enter your monthly GJ use and rate. See the equivalent cubic metres and the resulting energy charge.

Typical: 1 to 4 GJ in summer, 10 to 18 GJ in mid-winter.

Equivalent in m³
m³
Monthly energy charge
$
Annualised use
GJ

Energy only. Delivery, riders, GST, and the franchise fee add on top.

The non-obvious thing about seasonal patterns

Annual gas use of 100 GJ does not mean 8 to 9 GJ per month. A typical Alberta home uses 1 to 3 GJ per month in summer (water heating only) and 14 to 20 GJ per month from December through February (heating dominates). This concentrated winter load is why furnace efficiency upgrades pay back quickly — the savings show up in the highest-bill months.

What this means for your household

  • Confirm any quote is in $/GJ before comparing. Cubic-metre quotes need conversion.
  • Use your bill\'s 12-month total GJ for any honest comparison or budgeting.
  • Heating dominates winter use. Insulation and furnace efficiency are the big levers.
  • Cooking and dryers are small relative to heating. Focus on the big rocks first.

Frequently asked questions

A gigajoule heats roughly 2,000 to 2,500 litres of cold water to boiling, or runs a typical Alberta home's heating for 4 to 8 hours in a cold January day. It is a meaningful unit of energy.
Alberta's tariff filings use the metric gigajoule. Other jurisdictions sometimes use therms (US), MMBtu (industrial trading), or cubic metres (some European systems). GJ aligns Alberta with Canadian metric conventions.
80 to 140 GJ per year for a single-family home, with most of the use concentrated in November through March for heating. Apartments and townhouses use less; large rural homes more.
No — also the monthly admin fee, the fixed distribution charge, and the term/exit fee. Use the all-in framework from the compare-energy-plans guide.
1 GJ ≈ 26.8 cubic metres of natural gas, depending on the gas's exact heating value. Most Alberta bills show both, with GJ as the headline.