Have been on my local power company, NVEnergy, TOU rate for the full year now. Every electrical device in the house benefits from the TOU rate, not just EV charging. Received yearly comparison today from NVEnergy. Yearly savings was $85 vs. my previous standard rate. Charging the Prius Prime is about $10/month. Can opt to go back to my old rate. However, think I'll stay on the TOU program.