Tesla Motors Club

I received the letter below from PG&E regarding the billing on my account that has solar and Powerwalls. The essence is that they are implementing a change in the billing system that will detect if and when you are feeding more energy into the grid than what your solar is supposed to be producing. In my detailed NEMMT billing, there is a table labeled "Summary Totals". That table has columns for "Exported to the Grid" and "Solar Generation Eligible for Credit". I believe this is where any discrepancy between your actual export and your credited export would show up. On my completed true-up all the figures matched. In theory, the way Powerwalls are currently programmed in the USA, there should never be any net export in excess of the actual solar generation. I think the only cases where the Powerwalls would export into the grid would be a virtual power plant or demand response program. I don't know of any program like that active in PG&E territory.