Locke never said that he didn't like technology. He was mad at Ben and the Others for having all the modern conveniences on the island. Called them Cheaters. I was thinking that Jacob drew his power from the flashlight, came on here to post that theory but Sabathius beat me to it... days ago. Anyway, I watch Ghost Hunters and the theory is that ghosts draw energy from the air which makes cold spots. Which is similar here. Ben has some voodoo going on with Jacob, ring around his house, jars of blood, no power/electicity.