Each regulated entity shall determine the annual CO₂ emissions from activities referred to in Annex III to Directive 2003/87/EC by multiplying for each fuel stream the released fuel amount by the corresponding unit conversion factor, the corresponding scope factor and the corresponding emission factor.

The emission factor shall be expressed as tonnes of CO₂ per terajoule (t CO₂/TJ) consistent with the use of the unit conversion factor.

The competent authority may allow the use of emission factors for fuels expressed as tCO₂/t or tCO₂/Nm3. In such cases, the regulated entity shall determine emissions by multiplying the released fuel amount, expressed as tonnes or normal cubic meters, by the corresponding scope factor and the corresponding emission factor.