#0 - May 15, 2007, 2:44 p.m.
Blizzard Post
We're in the process of reevaluating the power consumption needs of the goggles. It was felt that the Primal Nether would be able to sufficiently power the devices, but through further testing we're currently investigating other power sources and their availability.

http://forums.worldofwarcraft.com/thread.html?topicId=102815795&postId=1027009325&sid=1#42