Power Save can schedule different Power Policies to take effect on the workstation during different times in the day. Three Power Policies are included by default: Workday Policy, Evening Policy, and Patch Policy. For example, the Workday Policy could have less aggressive power management settings than the Evening Policy.
Administrators can chain any number of policies together as required to meet thier needs.
Any given policy that is applied will remain in effect until another policy replaces it as defined in the Power Plan.