Change Energy Saver preferences on a Mac desktop computer
Use Energy Saver System Preferences to set options that control your computer’s energy use.
As an ENERGY STAR® partner, Apple has determined that standard configurations of your Mac meet the ENERGY STAR® guidelines for energy efficiency.
For more information about ENERGY STAR, see the ENERGY STAR website.
Note: Some of the options may not be available, depending on your Mac.
To open the pane, choose Apple menu 
Open Energy Saver preferences for me
Option | Description |
|---|---|
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 uses 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. |
Schedule | Set a daily schedule for putting your Mac to sleep or turning it off and on. |