The benefits of save energy are perhaps most evident in mobile devices as this will allow the battery is longer, but also the users of desktop computers may also have their reasons for this, because electricity costs are always high.
SmartPower is an application that offers several features to help reduce energy consumption and installed in Windows like a service. From multiple tabs offers few options to customize fairly completely the behavior of your computer.
For example, we can start with basic configurations as turning on or off your computer at a certain time, to specify more complex options: staying on if certain devices are connected to it (for example indicating a particular IP address or host name), or whether certain processes are running. Also, if the download speed of a given network interface is superior to X Kbps or if CPU usage exceeds a certain percentage.
SmartPower is a freeware utility compatible with Windows 7, Vista and XP.