The building occupier, in collaboration with the energy assessor, will need to obtain actual meter readings or consignment notes for all fuels used in the buildings that are affected by this legislation. This may include gas fuels, oil fuels, solid fuels, district heating and cooling, grid electricity and electricity generated on site or obtained by private distribution systems from other sites.

For district heating and cooling and electricity generated on site, or obtained by private distribution systems from other sites, the average carbon factor for the fuel over the accounting period will need to be obtained e.g. in kg of carbon dioxide per kwh delivered.

You can obtain the information required to produce a DEC from a number of sources:
• on-site energy meters
• building landlord or representatives
• utility suppliers