There was a good doco on the project, which i forgot the name of.
Perhaps it was this one: http://www.imdb.com/title/tt0457359/

Long story short: some areas on lunar poles are exposed to sunlight pretty much all the time, like Malapert Mountain. The plan was to build small settlements there, along with solar panels and a device which would beam energy down to Earth as microwaves. You'd have to see the doco for more details :|