Change Energy Saver preferences on a Mac desktop computer
Use Energy Saver System Preferences to set options that control your 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 Preferences, then click Energy Saver.
Power Adapter and UPS panes
Click either the Power Adapter pane or the UPS pane, then select energy-saving options for that power source. Your Mac will use those options when it’s getting power from that source.
You see the UPS button only if your Mac is connected to an uninterruptible power source.
“Computer sleep” and “Display sleep” sliders
Drag the slider to set the amount of time your computer or display should wait before going to sleep.
Put hard disks to sleep when possible
Puts the hard drive to sleep whenever the computer is inactive.
Wake for network access
Even in sleep mode, wakes to provide access to shared resources, such as shared printers or Music playlists.
Enable Power Nap
Checks for email, calendar, and other iCloud updates while sleeping on battery power.
Allow power button to put computer to sleep
Allows you to press the power button to put your computer to sleep.
Prevent computer from sleeping automatically when the display is off
Keeps the computer from going to sleep when the display sleeps.
Start up automatically after a power failure
Start up your Mac after a power interruption.
Set a daily schedule for putting your Mac to sleep or turning it off and on.