Yes, electric roller skates do exist. They are called electric inline skates or e-skates. These are essentially roller skates with an electric motor and a battery attached to them. The motor powers the wheels and allows the user to move without having to push off the ground with their feet. E-skates typically have a control system that allows the user to adjust their speed and direction. Some models even come with Bluetooth connectivity and smartphone apps for additional features and customization.