You just have to do a search for ''powersave'' in Synaptic and you'll have it! We're in 2014, and while some tasks are still better made in Konsole, some are better made with graphic tools.
Funny thing, since opinions change from person to person. For example, IMO the best tool to manage packages is aptitude from a terminal and I would never change that unless there is a major reason for doing so ;-)
Cheers Michele