My power company has both TOU and EV-TOU. There's a big difference, and it is important to consider the difference. The TOU (Time of Use) simply means that the rates vary by time of day. Whenever possible, charge your car during the lowest TOU rate (e.g. super-off-peak might be midnight to 6am). We all know that. But what gets lost in a lot of the discussion is that some of the Rate Plans have a baseline (or tier). A baseline is a monthly goal that is set by the power company for you. If you go above this goal, they add a hefty increase to your rate. For instance: My normal rate is 23 cents for the first 300 kWh, and then 43 cents for each kWh above 300. In other words, the rate almost doubles. There's 20 cent penalty on every kWh after reaching your baseline. (FWIW, I almost never exceeded my 300 kWh baseline... until I bought an EV). So now, if I stay on my original plan, almost every kWh for my car is costing me 43 cents. Why?... because my house uses the entire baseline and everything beyond that (car charging) is at 43 cents. Time to explore this EV-TOU thing!!! In San Diego (SDG&E), the EV-TOU rates appear to be slightly higher than the normal TOU rates. So then why would anybody choose the EV plan?... Simple... because the EV rates increase or eliminate the Baseline threshold. No 20 cent penalty. That means I charge my car for 23 cents per kWh (instead of 43 cents). Always consider the baseline or tier when choosing a Rate Plan. The cost difference can be significant.