Not at all how it works and it is ONLY available on the Mazda 3s GT as part of the optional tech package. The alternator is only engaged when your foot is off the throttle and the current is stored in the battery AND capacitors to be used later. Alternator is not engaged when throttle is applied. The brakes are not involved at all to produce current.Not sure if this applies, but Mazda now has a brake regeneration system they call "i-ELOOP". It uses capacitors to generate electricity via kinetic energy from your brake system to power electric components. Part of skyactive system I think.