On Windows Vista/7, there is no GUI option to rename a power plan. You must use the “powercfg” command line utility to achieve this task.
Open the command line (Start, Run – or type directly in the bottom search bar) :
cmd
Then, in the command prompt, type this command to list all power plan profiles :
powercfg list
Then, copy the power plans GUID using the contextual menu and type the following command to rename the profile :
powercfg -changename <GUID> "New_Power_Plan_Name"