Waste – to – Energy plants put the energy content of residual waste, not suitable for sustainable recycling, to good use: producing electricity and heat from a locally available energy source. Waste-to-Energy technology is one of the most robust and effective alternative energy options to reduce CO2 emissions and to save limited fossil fuel resources that would otherwise be used to produce the energy. Waste-to-Energy Plants in Europe can supply 17 million inhabitants with electricity and 15 million inhabitants with heat. This is based on 88 million tonnes of residual household and similar waste that was treated in 2014 in Europe. Then between 9 and 48 million tonnes of fossil fuels (gas, oil, hard coal and lignite) can be substituted annually, which would emit 22-48million tonnes of CO2. Waste-to-Energy helps to achieve low-carbon policy objectives and to ensure security of energy supply.