Hydro's first factory was built at Notodden (opened in 1907) followed up with another at Rjukan, Tinn (opened in 1911). Then in 1920 production was established at Glomfjord in Nordland. In 1930 Norsk Hydro opened a plant at Herøya outside Porsgrunn. To begin with it was to function as a shipping port for the fertilizer as well as a point to import limestone. From 1936 Hydro also started producing fertilizer at Herøya. There was also opened a railway, Rjukanbanen, connecting Rjukan with Hærøy. The railway opened in 1909 and consisted of a railway ferry across Lake Tinn, railway again with the Tinnoset Line and a barge ride from Borgestad to Herøya with barge on the Telemark Canal. The canal was superseded by the Bratsberg Line in 1916.