Norsk Hydro Rjukan is an industrial facility operated by Norsk Hydro at Rjukan in Tinn, Norway, from 1911 to 1991. The plant manufactured chemicals related to the production of fertilizer, including ammonia, potassium nitrate, heavy water and hydrogen. The location was chosen for its vicinity to hydroelectric power plants built in the Måna river.
30 million tonnes of products, equivalent of 1.5 million wagon loads, were produced in Rjukan. After the closing parts of the plants and the railway have been preserved.