To achieve 15 credits for Ene 01, a building must show that it has ‘zero net carbon emissions’ as defined in the manual. For countries where CO2 is not assessed by local regulations, this cannot be evidenced, and therefore the maximum score is 14 credits. In order to achieve more than 14 credits, the building must be modelled using approved software which can output the CO2 metric and demonstrate zero net, or negative carbon emissions.