A+: Less Power!

A+: Less Power!
ACPI, the Advanced Configuration and Power Interface, was first published in 1996 as an open standard, was first included in Windows '98, and has replaced the earlier APM Advanced Power Management, which was dropped from Windows when Vista was released. ACPI provides common interfaces for finding what kind of hardware a PC has, and how to manage it. The computer's main board, CPU and operating system must all support it to work.

How do I fine-tune my power settings?
in XP, do Start | Control Panel | Performance and Maintenance | Power Options
in Vista, do Start | Control Panel | Mobile PC | Power Options
in Seven, do Start | Control Panel | Power Options

Or, right-click on an empty spot on the Windows Desktop, | Properties | Screen Saver | Power

There are four or five tabs: Power Schemes, Alarms (laptop) or UPS (some desktops), Power Meter, Advanced and Hibernate. In Power Scheme, Portable and Laptop machines have a separate setting for when plugged in vs when on battery. Save As allows customization and fine tuning of the power settings.