In order to calculated the points relative to NC-v4 EAc2 - Optimize energy performance shall the produced electric energy from a renewable source that is sold to the national grid be considered (e.g. subtracted from the energy cost) too? Or only the part that is used onsite?
Shall its energy cost savings be evaluated with a cost rate equal to that one of the purchased electricity? Or shall the energy cost rate that the national grid administrator pays be considered?