
The Barcelona subway grinds to a halt, the doors slide open and commuters pour out to go about their daily business.
Little do they know that as they do so, a burst of energy is sent up to street level to help charge an electric car.

The Barcelona subway grinds to a halt, the doors slide open and commuters pour out to go about their daily business.
Little do they know that as they do so, a burst of energy is sent up to street level to help charge an electric car.