What is the difference between the emission factor for electricity and the CO2 emission factor?
The emission factor for electricity represents the weighted average emission factor of all electricity-generating sources (including nuclear and renewable sources) in a geographic area (e.g. third country, group of third countries or region within a third country). By contrast, the CO2 emission factor represents the weighted average emission factor of those electricity-generating sources that are based on the combustion of fossil fuels. This means that the CO2 emission factor is always larger than the emission factor for electricity for the same geographic area,
During the transitional period, the use of a CO2 emission factor for electricity is the default method to determine the specific direct embedded emissions for electricity as a CBAM good. By contrast, the emission factor for electricity is used for the default method to determine the specific indirect emissions for CBAM goods other than electricity.
Source: EC’s Questions and Answers on CBAM