Since 1 January 2005 Dutch power companies must label the electricity they supply according to its source. CE Delft has determined the mix of the electricity supplied in the Netherlands in 2010. Over 50% derives from gas-fired power stations, with coal accounting for 16%, nuclear for 4% and renewables for 26%. The environmental consequences expressed in terms of CO2 and radioactive waste are 332 g CO2/KWh and 0.0001 g nuclear waste/KWh, respectively.