Posiva Oy is a Finnish company with headquarters in the municipality of Eurajoki, Finland. It was founded in 1995 by Teollisuuden Voima (60% of stock) and Fortum (40% of stock),[1] two Finnish nuclear plant operators, for researching and creating a method of final disposal of spent nuclear fuel from their plants.[2][3][4]
For this purpose, Posiva is currently constructing the Onkalo spent nuclear fuel repository, the world's first deep geological repository, at the Olkiluoto Nuclear Power Plant site.