Guide to System Preferences

Energy Saver Preferences

These settings will save energy and your battery life if it is a MacBook.

Energy Saver prefs


Turn display after x minutes. Use the slider to set time to turn off the display screen after a number of minutes of idleness.

Prevent computer from sleeting automatically when the display is off. Useful if you left the computer to do something, while
you are not there to work on it or monitor it.

Put hard disks to sleep when possible. Magnetic hard drives can use a lot of energy, so if you not using it them turn them off too.

Schedule. Set a date and time when you want to put your mac to sleep regularly e.g. during the night.