A Dutch civil engineering firm thought of using the solar energy stocked in the asphalt of roads and parking lots to heat the buildings nearby. Hence, energy collected on 3 000 m² of road surface heats a 14 000 m² industrial complex for one whole winter. A lattice of water pipes installed beneath the asphalt lets the water heated on sunny days flow. The water is then stocked deep down below in natural aquifers. This system also helps maintain the networks of roads, rails and waterways.