Power Policy Settings

Power plans and schemes consist of preferences and policy settings.

A power plan consists of a group of power setting preferences. These preferences consist of both an AC and DC value for each of the power settings. Each power plan is identified through a unique GUID as well as a friendly name. Windows Vista has three default power plans: Power Saver, Balanced, and High Performance. These plans can be customized, and additional plans can be created. All power plans have a personality attribute that indicates the overall power savings behavior of the plan.

The following table shows the three power plan personalities.

Display nameDescriptionGUID
Power SaverDelivers reduced performance which may increase power savings.a1841308-3541-4fab-bc81-f71556f20b4a
BalancedAutomatically balances performance and power consumption according to demand.381b4222-f694-41f0-9685-ff5bb260df2e
High PerformanceDelivers maximum performance at the expense of higher power consumption.8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c


Note  Devices that support Modern Standby mode only allow the Balanced power plan. Modern Standby is the newer, more streamlined solution to power settings management.

Each computer has a single, active power plan. By default, nonprivileged users are able to access system power settings. Access to all or individual power settings can be controlled through ACLs on the power settings or through Group Policy. Applications should call PowerSettingAccessCheck to determine if the user has access to the power setting.

Each power setting is identified by a unique GUID and includes a friendly name, description, allowable values, and default values for AC and DC. Custom power settings can be created using the PowerCreateSetting function.

Related topics

Power Schemes