October 17, 2011 London?s First Certified Passivehaus Shaves 90% Off its Energy Bill Edit Delete Tags Autopost Filed under: Solar Energy News Source: http://inhabitat.com/london%E2%80%99s-first-certified-passivehaus-saves-up-to-90-of-energy-bills/AUTOMATIC DATA PROCESSING AVNET BHARTI AIRTEL BT GROUP CANON MEMC ELECTRONIC MATERIALS