Hi JordanI believe that the data as featured in the extract from the CSV file for my power usage, as featured in my original post, is corrupt, as reflected by an adjustment that has recently been made to by AGL electricity bill. As yet, I have still not had a satisfactory reply to my initial query that explains how to interpret the half hourly interval data and in particular, if someone can confirm that there should be only one register code active for each of grid sourced power and solar power ...