The quantity category contains emission factors for all major fuels and electricity generation.
Although you can create profile items in the electricity and electricityiso categories, it's preferable to create a type=electricity item in quantity and set the country in the /metadata item - see the quantity category for more detail.
Data
This is a documentation category, and contains no data.
For categories which contain data items, see the links in the above documentation, or the list of related categories on the right.