Energy can be created nor be destroyed. just, it can be converted from one form to another . Taking large amounts of heat energy is lost to the atmosphere during. It will be good if it can store this energy somehow which is otherwise getting wasted out and it next time we started to accelerate. During regenerative braking, slowing the vehicle's kinetic energy, the accumulated energy, refers to a system that is temporarily stored and used again as kinetic energy during acceleration or operation. Regenerative braking is a small, yet very important, step toward our eventual independence from fossil fuels. These brakes allow batteries to be used for longer periods of time without the need to be plugged into an external charger. It types of brakes also extend the driving range of fully electric vehicles. Regenerative braking is a way to extend range of the electric vehicles. In many cases, hybrid vehicles, this system also applies to hybrid vehicles improve fuel economy.Normal car is just about 20% efficient, meaning some 80% of the energy it expends is wasted as heat created by friction.
Regenerative braking we mobilize more fuel to create heat which is produced by using fuel instead of paying equals wasted energy is wasted to the environment, you can get back up to half