I am seeking help with the theory of energy conversion from kinetic energy to electric energy. Is it possible to convert kinetic energy to electric energy at an efficiency higher than 75% If so, how? Specifically, I mean not using heat (cogeneration power plants) or potential energy (hydroelectric plants). But just turning motion into electricity (faraday effect, brakes on a Prius, etc.). Can someone point to a source that gives a percentage conversion higher than 75%?