A bulldozer moves coal within one of two hermetically sealed domed shaped storage buildings at the Torrevaldaliga Nord power station. The dome shape is designed to avoid coal powder escaping into the atmosphere. The power station is said to be the world's least polluting coal-fired power station. It is one of the most innovative and modern plants in the world, emitting less greenhouse gas than other coal-fired stations, as well as the oil-fired plant it was converted from. .