Microsoft Group Policy Preferences provide a way to centrally activate monitor and computer power management features on Windows PCs. They require Windows Server 2008 or newer.
Keep in mind that Group Policy Preference settings are not enforced. This means that end users can change preference settings, but the changes will be lost on every Group Policy refresh. (The default is every 45 minutes.)
For general information about Group Policy Preferences, see the Microsoft white paper, An Overview of Group Policy Preferences. For additional details on using Group Policy Preferences to manage Windows Power Management settings, see Sustainable Computing: Power Management Settings for Compliance and a Reduced Footprint.