The original topic was about EV chargers. The power supply is external. If it pleases you, leave as much power turned ON as you can at your house. It will really, really help the environment by putting more exhaust gases into the atmosphere at your local power plant. Electric vehicles are going to be a huge problem when the majority of people own one. I doubt if that will actually happen. We will run out of electricity long before that happens, unless we build a huge number of nuclear power plants in the next 30 years. Many utilities are making plans for building nuclear already. What other practical choice do they have left, after petroleum is gone?
No, I do not advocate going around unplugging appliances. There is no need because most of them still have an ON/OFF switch. Unfortunately there are a lot of newer devices now that do not have an OFF switch. When I was in electrical engineering school, the first thing designed into a circuit had to be the On/Off switch. Without that, you had nothing. Now people are paying huge prices for those little nothings.