Every day, Amsterdammers cycle 2 million kilometers all together. When people pedal to work, to the gym or to the other side of the city, an average of 19.5 million watt-hours is generated. It’s a crazy amount of energy — enough to power thousands of households. What if we could bring this energy back home? This, is exactly the idea behind the S-PARK; a bike rack that turns the energy produced by people on their bike, into electricity for their own neighborhood. How does it work? Simple. Every neighbor is given a special front wheel. Once installed, it stores the energy generated while cycling and braking in batteries. And at the end of the day, when everyone comes back home and parks their bike, the energy is then redistributed into the neighborhood’s electrical grid, providing enough clean electricity to power all the surrounding streetlights, to play video games or power a fridge during a full day.