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