I can see how the calculations are different for you, as you also have solar panels feeding electricity back into the grid. I had not really considered solar for the house as our current electric bill is only about $100/month. So we would just have solar for the pool. Like I said, I filter (with a multi speed, newer pump) for 6-8 hrs a day. But right now, I could easily change the time of that pumping to midnight to 6 am if TOU came to be. But you can’t do that if you need to pump water to the roof of your house during the hottest part of the day.
I mentioned this to one contractor and he (politely) scoffed at my concern. He said that either (i) this TOU will not happen or (ii), the utility (SDG&E) would be forced to give customers that are heating their pools the reduced rated during the hottest part of the day. I’m currently checking claim (ii) out. Off-hand, I wouldn’t think SDG&E would have to do anything they don’t want to – unless there are gov’t regulations saying otherwise.