The main climate impact from your energy use is from the carbon dioxide emissions associated with combustion for the generation of electricity or heat. In the case of electricity this arises from the burning of coal, gas, biomass or waste in a power station, and as such the carbon emitted for a unit of energy (its carbon intensity) varies according to the mix of generation occurring from hour to hour.
For the purposes of benchmarking emissions over a year, we use the average figure for carbon intensity specified in the government’s 2019 Standard Assessment Procedure for Energy Rating of Dwellings (SAP 10.1), currently 136gCO2/kWh.
In the case of gas, the carbon dioxide emissions occur at the point that the gas is burnt to generate heat in your house and the carbon cost of a unit of gas does not vary.
Although some energy suppliers provide 100% renewable electricity tariffs, we have chosen not to take this into account in our CO2 emissions calculations. Trying to calculate how much carbon you use is a pretty murky business, and we don't want to give the impression that a "green" tariff means that your electricity doesn't have a carbon cost. It's a huge topic with lots of different perspectives - how about joining a discussion on our forum?Back to your results