I have started using Office for Mac 2011, 14.5.5, about 1 week ago.  When I run it, I notice my battery power drains much faster compared to NOT RUNNING Mac for Office.  I have a MacBook Pro which can run for about 10 hours on battery when using Apple Mail, Pages, etc. But with Office for Mac, I get only about 5 hours. 

MS Tech Support replied that Office for Mac is a big program so it needs more battery power.  Are there options to conserve battery power?