As a default, we use the emissions factors that are published by the UK government. We store these values historically so that your reports will use the relevant factor for the relevant date.
You can amend the emissions factor to a different source in Settings. This parameter is stored at Company level in the Tree.
All carbon reports convert your kWh value to kgCO2e.
More information
You can find the current published Government Emissions Conversion Factors for Greenhouse Gas Company Reporting here.