The Power Management initiative was introduced in OSR2 and is the kingpin of the OnNow initiative. The Power Schemes tab allows you to choose one of the pre-defined schemes that suits your PC, be it laptop, desktop or server. The settings are shown below in the scheme box and you can adjust when hard drives and monitors should be turned off, and if applicable when this should be done if the PC is running on batteries or from a power supply. There is also the overall Standby mode setting which defines when other devices should be powered down until the PC is in a state of minimal power usage. In this state you can wake the system up by using an input device - tap the keyboard, move the mouse, etc. If you customise the settings you can save them back out as a personalised scheme.

The other tabs allow you to set alarms for what is to happen if batteries run low (laptops only), whether a warning should be shown and whether the system should go into Standby for power saving automatically after a warning. You can also use a slider to define at which point out of 100% the system should consider the batteries to be running low.

The Advanced tab simply allows you to choose to show a power icon in the taskbar displaying the battery status (and whether a password is required when the PC is re-awakened after going into Standby), and the Power Meter is just an elaboration of the taskbar icon.

See also Screen Saver in Display Control Panel, OnNow, Shut Down