Crap, that's not even the right movie.

Cause that's the one where there's a clean method of producing energy from water, but Morgan Freeman (who's not giving the main character sage advice FOR ONCE) says it has to be kept under wraps or it'll destabilize the world.
But yeah, if this idea pans out, and they didn't wind up burning additional fossil fuels for the electrolysis procedure, that'd be cool.