On the small island of Händelö, a part of the city of Norrköping in East Sweden, there is a remarkable energy symbiosis where the surplus from one company is used as a input to a neighbouring company. Everything is based on green energy!
The eco-industrial park outside Norrköping consists of a waste incineration plant that sends steam to fuel a grain based ethanol production plant for biofuel production, a biogas plant and a carbondioxide factory. The waste energy sends electricity and district heating to Norrköping, and the residual steam to the ethanol production plant. Those parts of the raw material that do not become biofuels are used as protein-rich animal feed and the carbon dioxide produced during production is sent to the Norlic carbon dioxide factory, which turns it into carbonic acid and resells the food industry. The ethanol plant also sends its residuals to the adjacent biogas production plant where biogas is produced for the automotive industry and manure to nearby fields.