A friend of mine just mentioned a movie he had seen a long time ago, and it sounded rather interesting, however he couldn't remember the name of it. The premise is that some type of large power grid is built, and at the moment it goes online everybody in the world seems to disappear. There is one man left wandering around trying to figure out what happened, and he comes across other survivors who join him in his search to figure out what the hell happened. He thinks the movie might have been from the 70s. Anyone know what the name of this movie is?