Solar collectors heat the water, while electricity is generated by solar cells.
The excess solar energy in summer is stored not as heat but in the form of hydrogen, in a tank in the garden. In the winter, a fuel cell recombines the hydrogen with atmospheric oxygen to produce electricity. The transparent insulation makes the solar house particularly energy-saving. It allows sunlight to penetrate to the walls of the house, but prevents the warmth escaping again. Blinds shade the walls in hot weather.