PowerCfg is a utility built into Windows 7 OS, that can be used for evaluating system energy efficiency of the system. IT professionals can use these PowerCfg enhancements to diagnose and resolve end-user problems with portable computer battery life and desktop energy efficiency.
In addition to power policy configuration, PowerCfg also enables system manufacturers to inspect a Windows platform for common energy efficiency problems. Many individual energy efficiency problems can be detected, including inefficient power policy settings, USB device selective suspend issues, and platform firmware problems that relate to processor power management capabilities. Here is a video that shows how to use PowerCfg to evaluate system energy efficiency and details the energy efficiency problems that might be detected.