The Svelgfoss Power Station is a hydroelectric power station located at the river Tinnelva in Notodden, Telemark, Norway. It operates at an installed capacity of 92 MW, with an average annual production of about 500 GWh. In 1907, the power station was the largest in Europe and the second largest at the world. It was used to provide electric power to the fertilizer plant in Notodden. In July 2015, the whole complex, the Rjukan–Notodden Industrial Heritage Site, was designated a World Heritage Site.