Commercial computer servers have grown not just in numbers but also in their individual power demands, resulting in an alarming electric consumption trend. Today's kitchen refrigerator-sized rack of computers can now weigh as much as a Toyota Camry and consume as much electricity as 15 homes. Data centers, buildings which house tens to hundreds of racks, cost up to a billion dollars to construct and now account for 2% of the electricity consumed in the U.S., a figure which has doubled in the last five years. Austin and San Antonio house some of the world's largest. In an energy-constrained world this growth is unsustainable and comes at increasingly unacceptable social costs. In response, computer manufacturers are refocusing their commercial server designs towards energy efficiency for the first time. This talk describes the energy challenges of supporting the world-wide internet and what governments, electric utilities and the computer industry are doing about them.