Keeping in mind the European Parliament mandate for all new buildings constructed in Europe after 2020 to be nearly carbon-neutral, it is generally expected that in this century photovoltaics will become a substantially contribution to the power production of buildings. The increasing number of solar panels mounted on roofs all over the world is a good development, but not fed by an architectural approach. The solar panels are an addition to the - by Koolhaas so-called - "Junkspace".

Beside somehow during the 1960s, we forgot everything we knew about the art and science of daylighting; cheap energy and air conditioning did us in. Many studies show us now the importance and benefits of daylight. Important for the best formation of roof daylight is to avoid direct light and allow diffuse light; in contrast solar panels require direct light. In this way a golden combination is found. A system that even allows comfortable, diffuse daylight as prevents a high energy peak at noon.