Behind the closed doors, Google is pursuing unconventional energy. This is a big thing in my opinion.
We're working on developing utility scale renewable energy cheaper than coal (RE<C) and accelerating the commercialization of plug-in vehicles through the RechargeIT project. Our over-arching vision is that one day a large portion of the world's vehicles will plug into an electric grid fueled by renewable energy.
http://www.google.org/rec.html
http://www.google.org/recharge
This is old news and strictly conventional. No overunity is being investigated at Googles.
No I don't mean they are in overunity research, just unconventional energy.