 Bydgoszcz gasworks was the largest in the Pomerania, and the 6th biggest plant of the Second Polish Republic.In September 1939, the gasworks was taken over by nazi authorities and incorporated into the new Urban Department (), together with tram system, water supply, power plant and brickyards.In 1943, German engineers launched a third furnace and rebuilt two vertically-chamber system furnaces, "Didier", with a total capacity of 22000 m3 of gas per day.