I have an electric car that charges at 220 volt 16A. I have a dedicated group for it at home, but the car also comes with it's own extension cord for any regular socket. It then charges at 220V 6A or 10A (selectable).
Most indoor hangars have some form of socket available, so charging there for a private owner could be done. But you'll likely get an electrical meter in between so you can pay for the huge power consumption.
Electrical planes are currently best for TMGs, as they shut down the engine anyway. You just lift yourself to altitude, go fly, and when necessary turn it back on.