Since 1 January, 2005 there has been a legal obligation in the Netherlands to label electricity as to its source. CE Delft has quantified the Dutch supply mix in 2008. It comprised power generated from natural gas (over 50%), coal (22%), nuclear (7%) and renewables (18%). The environmental impact expressed in terms of CO2 emissions and generation of radioactive waste is 413 g CO2/KWh and 0.000213 g nuclear waste/KWh, respectively.