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This chapter is from the book

Saving Energy and Managing Power

When you’re not using your computer, you can save energy by putting it to sleep. When you put your computer to sleep, the power mode is set to low and the screen goes black to save energy. Your computer is still running, so it takes less time for it to wake up. While your computer sleeps, you can use Power Nap (New!), if your Mac supports it, when AC plugged in or batter powered to download OS X and app updates and perform Time Machine backups to Time Capsule, so your computer is always up-to-date. You can use the Sleep command on the Apple menu to put your computer right to sleep, or you can put your computer and display to sleep automatically when it has been idle for a specific amount of time or when you schedule it at a regular time interval. You can also set the hard disk to sleep whenever possible to save more energy. If you have a Mac laptop, such as a MacBook, it automatically goes to sleep when you close the lid. You move your mouse or press a key to wake it up. If a security option is set in System Preferences, your computer requires a password when it wakes from a sleep.

Set Sleep Options

  • bluecircle_1.jpg Click the System Preferences icon in the Dock, and then click the Energy Saver icon.
  • bluecircle_2.jpg To enable or disable Power Nap (New!), click Battery or Power Adapter, and then select or clear the Enable Power Nap while on batter power or Enable Power Nap while plugged into a power adapter check box.

  • bluecircle_3.jpg Drag the slider to set a time interval for Computer sleep and Display sleep.

  • bluecircle_4.jpg To conserve energy, select the Put the hard disk(s) to sleep when possible check box.
  • bluecircle_5.jpg Click the Close button.

Set a Sleep, Startup, or Shut Down Schedule

  • bluecircle_1.jpg Click the System Preferences icon in the Dock, and then click the Energy Saver icon.
  • bluecircle_2.jpg Click Schedule, and then click Details, if necessary.
  • bluecircle_3.jpg Select or clear the Start up or waker check box. If so, select an interval from the pop-up, and then set a time.
  • bluecircle_4.jpg Select or clear the bottom check box. If so, select an operation from the first pop-up menu, select an interval from the second pop-up, and then set a time.
  • bluecircle_5.jpg Click OK, and then click the Close button.

Set Wake and Power Failure Restart Options

  • bluecircle_1.jpg Click the System Preferences icon in the Dock, and then click the Energy Saver icon.
  • bluecircle_2.jpg Select or clear the Wake for Ethernet network access check box.
  • bluecircle_3.jpg Select or clear the Allow power button to sleep the computer check box.
  • bluecircle_4.jpg Select or clear the Start automatically after a power failure check box.
  • bluecircle_5.jpg Click the Close button.
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