One of the most important Mac System Preferences is the Energy Saver Pref Pane. Yes, you can adjust some of these settings to save energy so to speak. But, you can also setup what your Mac does in a power outage, how and when you screen goes dark and if you are on a laptop, you can adjust the battery settings. You can also schedule startup and shutdown times for your Mac. This article describes all the in’s and out’s of the Energy Saver Preference Pane.