Design, sustainability and integration into the circular economy are all essential aspects of these buildings. Almost all the depots are visible from the motorway, making them “visiting cards” for the Directorate-General of Public Works and Water Management. The design of the roof was one of the outstanding features. In the case of the Houten depot, the waterproof exterior layer of the roof consists of 1,600 solar panels. Everyone benefits – people living near the depot are co-owners of the panels and the owner (Directorate-General of Public Works and Water Management) owns 72 of them, which easily provide enough electricity for its own purposes. The Houten depot is an excellent example of “turning back the meter” – it produces more power than it consumes!