Steps to estimate home energy-related emissions
Measuring home energy emissions accurately requires gathering consumption data and applying emission factors that reflect how your electricity and heating fuels are generated.
Data to collect:
- Electricity usage from utility bills (kWh) over a year for accurate seasonal coverage.
- Heating fuel consumption: gas in cubic meters, heating oil in litres, or delivered wood/biomass quantities.
- Hot water and cooking fuel usage if separate from main heating.
Calculating emissions:
- Multiply electricity consumption by the local grid emission factor (kg CO2e per kWh). Grid factors vary by country and over time as grids decarbonize.
- Multiply fuel quantities by their standard emission factors (e.g., kg CO2e per litre of heating oil or per cubic meter of natural gas).
Improving accuracy:
- Use annual totals rather than short periods to avoid seasonal biases.
- For homes with solar or batteries, track export and import separately: net metering rules affect how much grid electricity is displaced.
- Consider appliance-level monitoring (smart meters, plug-in monitors) to identify high-energy devices.
Actionable use of results:
- Identify highest-use systems (heating, water heating, refrigeration) and target efficiency upgrades accordingly.
- Repeat measurements after upgrades to verify savings.
Accurate home energy emissions measurement helps prioritize investments and measure real-world emission reductions over time.