Division 6 Step 2 United Kingdom Original text. Later amendments are not shown. 6.1All the measured electrical energy output and all the measured useful heat output can be taken into account when applying the methodology for determining the efficiency of the cogeneration process if the overall efficiency of the cogeneration unit is equal or higher than 6.2Division 6.2 ← Division 5.13 Division 6 Division 6.1 →