Sweden's energy market is largely privatised. The Nordic energy market is one of the first liberalised energy markets in Europe and it is traded in NASDAQ OMX Commodities Europe and Nord Pool Spot. In 2006, out of a total electricity production of 139 TWh, electricity from hydropower accounted for 61 TWh (44%), and nuclear power delivered 65 TWh (47%). At the same time, the use of biofuels, peat etc. produced 13 TWh (9%) of electricity, while wind power produced 1 TWh (1%). Sweden was a net importer of electricity by a margin of 6 TWh. Biomass is mainly used to produce heat for district heating and central heating and industry processes.