St1's refinery in Gothenburg is widely recognized as one of the world's most efficient. It was environmentally certified as early as 1997, and since then we have invested hundreds of millions of kronor in improving our production of environmentally classed products. At St1's refinery, more than 200 experts in the energy industry work tirelessly with the production and maintenance of the plant. The refinery operates 24 hours a day, all year round.