How can ecological electric power be produced? ?Renewable energies? will become our most important suppliers of energy in the future. Production, storage and use of electricity from natural energy sources such as water, wind and the sun are graphically illustrated using various models and numerous experiments. These two solar modules not only guarantee more power; the many new attachment possibilities ensure flexible use in the models. The Gold Cap included for power storage can release the stored power at a slower rate. This helps children understand energy forms of the future. The ?Fuel Cell Kit? (Art.-No.: 520401) offers an ideal addition. With this expansion construction set, you can build other models and operate them with a fuel cell.