The industrial symbiosis project at Kalundborg, Denmark (100 kilometers west of Copenhagen, population of approximately 15,000), is a model of environmental sustainability. Industrial symbiosis is a process whereby a waste product in one industry is turned into a resource for use in one or more other industries, in a closed cycle. The Asnæs Power Station, receives 700,000 m3 of cooling water from Statoil each year, which it treats and then uses as boiler feed water. It also uses about 200,000 m3 of Statoil’s treated wastewater for cleaning each year. The savings to local water resources are considerable: nearly 3,000,000 m3 of groundwater and 1,000,000 m3 of surface water per year.