Porsche will reveal a hybrid version of its 911 GT3 R racing car at the Geneva motor show in March.
The technology has been developed for racing application, so two electric motors supplement the 480bhp 4.0-litre engine.
However, instead of the batteries you'd find in a hybrid road car, a generator powered by the car's flywheel delivers energy to the two electric motors.
The generator is charged whenever the driver applies the brakes, at which point the electric motors stop delivering power in order to act as generators themselves.
Rather than braking energy being lost as heat, it is converted into power that can be used at a later time by the car's driver.
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