My home charging cost is close to $.013 / kWh all-in. I briefly looked into converting to a Time-of-Use plan, but it's not clear that would work out for me. My dominant home electricity use is not charging the Tesla, it's running the central air during the hot part of the day - and I can't shift that to nighttime. Running appliances and the HPWC at night won't make up for that on-peak use. Solar would be a natural, but a heavy up-front investment.
I believe the supercharger rate is 35 cents locally, nearly 3X my home charging cost, so I won't be using those much at all. I do still have 1000 miles from my referral program (ordered the car in 2Q 2021). These will expire in May, and I've never used any so far. I'd be happy to give them to a friend but it seems this is not possible.