waste-to-energy at Portion of energy produced from renewable sources (incl. waste-to-energy at 51%) and similar 50.8% 51.2% 51.1% 54.0% 63.1% 67.8% Waste-to-energy plant emission levels vs legal limits (real concentrations/legal limits: best value <100%) 22.4% 21.2% 19.3% 17.1% 13.4% 13.0% Quality of treated water vs legal limits (real concentrations/legal limits: best value <100%) - - - - 35.5% 36.1% Compliance with Kyoto Protocol (real emissions/assigned emissions) 98% 86% 64% 70% 89% 57% Non-invoiced water (physical and administrative losses from the civil aqueduct): cm/km of network/day - 8.42 8.27 7.94 7.87 - Separate waste collection 28.9% 31.2% 36.0% 42.0% 44.8% 47.8% Vehicles using low environmental impact fuels.