EnerGuide rating gigajoules per year scale – New Homes

Gigajoules EnerGuide rating scale


Image of the new rating scale

The EnerGuide rating demonstrates the energy performance of a home. .

Aim towards zero on the rating scale. The lower the number, the better energy performance of the home.

Best energy performance indicates high performing homes, with a rating of zero gigajoules per year meaning it produces as much energy as it consumes. Generally, these homes would be highly energy-efficient.



Image of the scale including annual rating of a house displayed next to the rating of a typical new house

An annual gigajoule rating (GJ/year) allows you to see your score as a unit of energy consumption, similar to how you would see a consumption rating of kilowatts per hour for appliances, litres per 100 kilometres for vehicles, or calories for food.

A typical new house is the reference point against which to compare your rating. It is a version of your house as if built to energy requirements in the National Building Code.

Standard operating conditions are used for things like hot water consumption, thermostat temperatures, and the number of occupants.



Learn about gigajoules

A gigajoule (GJ) is a unit of energy that can represent all energy sources you find in Canadian homes: electricity, fossil fuels and wood. In some regions GJs already appear on utility bills for fossil fuels. For instance, in Alberta the cost of natural gas consumed is typically expressed in dollars per gigajoule.

Using an energy consumption unit of measurement for the EnerGuide rating scale allows for energy improvements to be expressed in straight percentages up and down the scale. For instance, if your EnerGuide rating went from 100 GJ per year to 90 GJ per year, that is a 10% improvement.



Diagram of house showing various activities that use energy

One GJ of energy is equal to the energy consumed to do the following activities around your home:


  • Surf the web for 5,500 hours
  • Vacuum your house for 230 hours
  • Run a typical refrigerator for 30 weeks
  • Toast 3,000 bagels
  • Watch an entire National Hockey League Season: All 1,230 games
  • Wash over 100 loads of laundry


The average Canadian household uses 100 gigajoules of energy per year



EnerGuide Home Label


Image of the label

After an EnerGuide evaluation is performed on your home, an EnerGuide label will be given to you to affix to your electrical panel.

  1. Information about the evaluation for the homeowner
  2. EnerGuide rating
  3. EnerGuide rating scale
  4. The calculation of the rating
  5. Breakdown of the rated annual energy consumption


Homeowner Information Sheet

Image of Homeowners Information Sheet

Homeowner Information Sheet - details about the home and its rated energy performance.

Information includes:

  • How the rating is calculated
  • Your home’s building envelope characteristics
  • Your home’s mechanical component details
  • Key terms and concepts related to your home’s energy performance
  • Information on the next step to improving your home’s energy performance


This information helps you better understand how your home uses energy.