Bitt, it would have been nice if someone had mentioned the possibility of cutting the cable. Like hurly or Charlie (seeing as he was expecting to die). Then it could have been dismissed by Sayid while consulting the plans

As it stands, even though it may not be the power cable, it could be the communications link going to some antenna/array to do the scrambling.

Over all I can say this has been a very good season of Lost. So much for the nay sayers.