St1 Biofuels Oy, part of Finnish energy group St1, plans to build an ethanol plant at the site of a former paper mill in Norway that will use local forest industry residues as feedstock.

The company said Friday it has signed a letter of intent (LoI) for the project with Viken Skog SA, the largest forest owners' cooperative in Norway.

The planned Cellunolix plant, to be located at Follum in Honefoss, will be able to produce 50 million litres (13.2 million gallons) of advanced cellulosic bioethanol for transport fuel per year. The project is expected to reach investment decision in 2018 and become operational by 2021.

St1 has a business that focuses on waste-based, advanced ethanol production and production technologies. It is co-owner and technology provider for North European Bio Tech (NEB), whose first Cellunolix plant, which will use sawdust as feedstock, will go live in Finland this year.

According to the announcement, St1 is seeking locations for new Cellunolix plants in all three countries -- Finland, Sweden and Norway -- it operates in.