Long story is utility companies complain they are losing money. So before I got the COO on the renovation. My electric bill was actually negative because I was not consuming anything. But since we moved in that changed. From what I read, The consumption fee is because I am still pulling from the grid and consuming electricity during off hours ( night). I am not storing everything to a battery. So even though I produce more than I consume, they want a transaction fee for it. I might be wrong here and could look it up again. But that was what I found out when I looked into it last time.

Also, we can't guarantee that it will always be negative. It depends on the weather and usage. So far I have only had 1 month where I actually consumed more than I produced. So it is possible not to produce enough and why they handle it on a yearly basis and not a per monthly basis ( monthly rollover).