Change Energy Saver settings on a Mac desktop computer
Use Energy Saver System Settings to set options that control your Mac desktop computer’s energy use.
Note: Some of the options may not be available, depending on your Mac.
To open the pane, choose Apple menu > System Settings, then click Energy Saver in the sidebar. (You may need to scroll down.)
Open Energy Saver settings for me
Wake for network access
Even in sleep mode, wake your Mac to provide access to shared resources, such as shared printers or Music playlists.
Start up automatically after a power failure
Start up your Mac after a power interruption.
Enable Power Nap
Have your Mac check for email, calendar, and other iCloud updates while sleeping.
Set the time or battery level at which your Mac shuts down when using a UPS. See Set when your Mac shuts down while using a UPS.
If you want to turn your display off after a period of inactivity, see Change Lock Screen settings.