What
@Zaxxon said. Also, just having an EV is not enough to say yes or no to switching.
Reasons NOT to sign up for TOU:
* You don't have solar or a battery to almost eliminate your 2-6pm use
* You have electric appliances (range, oven, dryer, water heater, heat, AC, etc) and you expect to use them regularly between 9am and 9pm, or much at all 2-6pm.
* Your car usage (about 350 kwh for 1000 miles in a Model S) is less than 2/3 of your overall usage and you're not prepared to shift other electrical usage.
* You don't have flexibility to always shift the time of your non-EV electric usage because someone is home all day on TVs or computers, doing laundry, cooking, etc. This is true at any time of year but especially in summer.
Ultimately, the nighttime rates on the TOU plan just aren't low enough to make it a no-brainer for most people. If you're willing and able to pay a lot of attention to your electric usage throughout every day and can be flexible on when you use electricity, then it could be a decent win. If not, I wouldn't switch.