I pay $15 per month to be connected to the PG&E grid. I have no battery (Powerwall). There are other adjustments that bring it down a little.How is your bill only $9 a month? Even if you have a massive solar array and power wall I figured the connection fee to the grid would cost more? That's a great deal obviously, is this the case for many other people?
I have a yearly true up; so far my true up has been zero. I bought more solar than what was recommended, just in case. Glad I did because there are horror stories of people under-buying and ending up with surprises.