OS X Yosemite: Energy Saver preferences

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Energy Saver preferences
Set options that control your computer’s energy use

Use Energy Saver preferences to set options that control your computer’s energy use. If you have a portable Mac, these options also help you extend your battery’s life.


As an ENERGY STAR® partner, Apple has determined that standard configurations of your Mac meet the ENERGY STAR® guidelines for energy efficiency. The ENERGY STAR® program is a partnership with electronic equipment manufacturers to promote energy-efficient products. Reducing energy consumption of products saves money and helps conserve valuable resources.

For more information about ENERGY STAR, see the ENERGY STAR website.

Important:   The table below lists all of the options available in the Energy Saver pane of System Preferences. Because the features of the computer you’re using determine the options shown, you may not see all the options listed below.

To open the pane, choose Apple menu > System Preferences, then click Energy Saver.

Battery, Power Adapter, and UPS

Click Battery, Power Adapter, or UPS, 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 Battery button only if you have a portable Mac. You see the UPS button only if your Mac is connected to an uninterruptible power source.

Automatic graphics switching

To extend the life of your battery, set your Mac to automatically switch between graphics modes.

Put hard disks to sleep when possible

Put the computer’s hard disk to sleep whenever it’s inactive.

Wake for network access

Users can access your computer’s shared resources, such as shared printers or iTunes playlists, even when your computer is in sleep mode.

Slightly dim the display while on battery power

Reduce the brightness of the display while on battery power.

Enable Power Nap (while on battery power or Ethernet)

Permits your computer to check for email, calendar and other iCloud updates while sleeping. If turned on for Ethernet, your computer can also back up using Time Machine.

Allow power button to put computer to sleep

Select this option if you want to press the power button to put your computer to sleep.

Prevent computer from sleeping automatically when the display is off

Select this option if you want your display to sleep and your computer to stay awake.

Start up automatically after a power failure

Start up your Mac after a power interruption.

Show battery status in menu bar

Show if your portable Mac is connected to a power supply and the battery is charging , show if the battery is fully charged , or show the amount of battery power remaining.


Set a daily schedule for putting your Mac to sleep or turning it off and on.

Published Date: Sep 11, 2017