@Electricpower, I will make this really easy for you. AGL shows you your usage at thirty min intervals, however you meter is more than likely to be configured for 5 minute intervals (this way they can get more from you if you are stupid enough to have demand rate). Now, when you export power there is a meter for that, and when you consume power there is a meter for that. So every interval it reports your consumption and your export. When you look at your bill you are charged for your consumption ...