The ir. D.F. Wouda Steam Pumping Station is a pumping station in the Netherlands, and the largest still operational steam-powered pumping station in the world. On 7 October 1920 Queen Wilhelmina opened the pumping station. It was built to pump excess water out of Friesland, a province in the north of the Netherlands. In 1967, the coal furnaces were converted to run on heavy fuel oil.