For most applications, energy, obtained from coal or gas, is still used. The sun and the wind are also a source of energy, but how much energy is this exactly? And how much energy can be provided? To make people aware of this EnTranCe is going to create a playground in which children that are playing in the playground provide energy, this can be compared whit the energy from the sun and the wind. In total 10 groups of middle school students took part in this HIT challenge. Last Friday the final presentations took place in Assen the winner of this challenge is team Highlander.