Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy or potential energy into a form that can be either used immediately or stored until needed.
Mechanism for regenerative brake on the roof of a Škoda Astra tram
The S7/8 Stock on the London Underground can return around 20% of its energy usage to the power supply.
A Tesla Model S P85+ using regenerative braking power in excess of 60 kW. During regenerative braking the power indicator is green.
The box extending sideways from the roof directly over the word "operation" allows air to freely flow through the resistors of the dynamic brakes on this diesel-electric locomotive.
Energy recovery includes any technique or method of minimizing the input of energy to an overall system by the exchange of energy from one sub-system of the overall system with another. The energy can be in any form in either subsystem, but most energy recovery systems exchange thermal energy in either sensible or latent form.
Berner Tricoil Energy Recovery System atop the Center for Sustainable Landscapes in Pittsburgh, Pennsylvania
Electric Turbo Compound (ETC) cross section
