How to Change Mac Snow Leopard Energy Saver Preferences
Snow Leopard lets you change energy usage settings by accessing System Preferences, choosing the Hardware group, and then clicking Energy Settings. Mac offers settings for desktops and settings for laptops. Choose when your computer should go into sleep mode, when to power-down the hard drive, and more
Move the Computer Sleep slider to specify when Mac OS X should switch to sleep mode. The Never setting here disables sleep mode entirely. To choose a separate delay period for blanking your monitor, drag the DisplaySleep delay slider to the desired period. You can also power-down the hard drive to conserve energy and prevent wear and tear (an especially good feature for laptop owners).
If you want to start or shut down your Mac at a scheduled time, click the Schedule button. Mark the desired schedule (the Start Up or Wake check box and the Shut Down/Sleep check box) to enable them; then click the up and down arrows next to the time display to set the trigger time. Click OK to return to the Energy Saver pane.
Some of the settings can toggle events that control Snow Leopard’s sleep mode, including a network connection by the network administrator (Wake For Network Access). If you want the display to dim before your Mac goes to sleep, enable the Automatically Reduce Brightness Before Display Goes to Sleep check box.
You can also set Mac OS X to restart automatically after a power failure, which is a good idea if you’re running a Web or File Transfer Protocol (FTP) server on your machine. If you’re running a Mac laptop, click the Show Battery Status in the Menu Bar check box to select it.
Mac laptop owners can set two separate Energy Saver configurations:
Battery Power: Applies when their Mac is running on battery power)
Power Adapter: Kicks in when the laptop is connected to an AC outlet
You can also choose an Optimization mode, which is an easy way of immediately setting your MacBook for better performance or best possible energy savings.