Norsk Hydro
In 1905 he founded Norsk Hydro-Elektrisk Kvælstofaktieselskab (now Norsk Hydro). Eyde remained director-general of both companies. He was director-general of Norsk Hydro until 1917. He was offered a position on the board, where he remained until 1925, and a compensation of for ten years, and for the rest of his life.