Configuring Windows Server 2008 Power Parameters for Increased Power Efficiency

Tips & Tricks: Enable Standby in Windows 2008 R2 Server

Shutdown: %windir%\System32\shutdown.exe –s
Reboot: %windir%\System32\shutdown.exe –r
Logoff: %windir%\System32\shutdown.exe –l
Standby: %windir%\System32\rundll32.exe powrprof.dll,SetSuspendState Standby
Hibernate: %windir%\System32\rundll32.exe powrprof.dll,SetSuspendState Hibernate

Enabling/Disabling Hibernation and Hybrid Sleep in Windows Vista & 7

powercfg /hibernate {on|off}