These projects in Harderwijk, Zoetermeer and Etten Leur (The Netherlands) are supported by the World
Wildlife Fund (WWF). The goal of the projects is to achieve a very low energy consumption in sustainable
houses. Energy savings are up to 50%. With sustainable energy even 100%.
According to the Dutch Housing Laws an energy performance (EPc) = 1,0 is obliged. The project in Harderwijk achieves a much better energy performance (EPc) = 0,75, the houses in Etten Leur achieves an energy performance (EPc) = 0,50. Passive solar energy, photovoltaic solar energy, co-generation conservatories, thermal power station, sun rooms, solar collectors and heat recovery are applied in these houses.