An apparatus may generate energy in response to a vehicle wheel rotation. The apparatus may include a roller, a shaft, and a generator. The roller may rotate in response to a movement or motion of the wheel and may apply a friction to the wheel to decrease a rotational velocity of the wheel. The shaft may rotate in response to a rotation of the roller. The generator may generate an electrical output based on rotation of the shaft and convey the electrical output to an energy storage device or to a motor of the vehicle.