6. Fuel mix for production of district heating Environment Surplus heat Waste incineration 26,2% Refinery, industry 25,2% Electricity production 28,7% Waste water 2,7% Renewable resource Bio fuel and renewable electricity Fossile resource Oil, fossile electricity and natural gas
7. Heat production 1979-2005 Change in fuel mix GWh 1980 1990 1985 1995 2005 2000 Environment 0 1000 3000 4000 5000 2000 Oil Biofuel Natural gas Coal Heat pump Other waste Preem ref. Shell ref. Renova