The opportunity of a booming PC and data center industry brought an unprecedented increase in the need for computer space, as well as in the cost of power to support these installations. Back in 2002, data centers already accounted for 1.5 percent of the total U.S. power consumption and was growing by an estimated 10 percent every year. More than 5 million new servers were deployed every year and added a power supply of thousands of new homes every year. As experts warned of excessive power usage, hardware makers began focusing on more power efficient components to enable growth for the future and alleviate the need for data center cooling. Data center owners began developing smart design approaches to make the cooling and airflow in data centers more efficient. By 2007, large data center operators started leveraging renewable energy sources, sound as wind energy to run their data centers.