use of landfill gas in gas engines In 2000, the municipality of Madrid awarded engineering companies Vertresa, Cespa and Sufi – that sub- sequently formed Valdemingómez 2000 SA – to build and operate the Valdemingomez landfill gas-to- power plant. By covering an area of 110 hectares and accumulating about 21 million tons of waste over a period of 23 years (1978 – 2000), Valdemingomez is Spain’s largest landfill site. In accordance with efforts

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