This is here in Massachusetts. For signing up we get $40/kw in the winter and $180/kw in the summer! Our utility limits the events to 60 in the summer and 5 in the winter, between 2-7pm, 3 hour max per event, and a max draw of 5kw per Powerwall.
On this event that happened in early January, which was my first, I noticed before hand that the Powerwalls were charging from solar all day with the house running on utility. At first I was a little confused but then realized Tesla’s software was making the smart financial choice and using the cheap grid power to run the house and then right at 4pm, sold the stored solar back to the grid at the much higher price.