According to ABI Research, "From a pure coverage perspective WiMAX is twice as energy-cost-effective and metro Wi-Fi is 50 times more energy-cost-effective than WCDMA. When data traffic is factored into the equation, WiMAX can accommodate 11 times today's average data consumption and still be more energy-cost-efficient compared to WCDMA or HSDPA." According to the group, there's a lot of power that will be chewed up by these services in the years to come; global mobile broadband energy use will rise from 42.8 billion kilowatt hours (KWh) in 2005 to 124.4 billion KWh in 2011.