I wonder if the number works out, if you have solar w/ TOU and you get a Tesla Powerwall or something like it. The logic is that, solar will generate power at $0.48/kWh during the summer. We can use that power at night at $0.17/kWh. At the same time, we can charge the Powerwall at $0.17/kWh at night for usage during the day at $0.48/kWh. I need to run the number to see if it make sense (all depends on how much the powerwall or other battery pack cost), but briefly thinking about it, it seems to make sense.