Solar energy is free. It is abundant. It is largely untapped. Most of our food supply relies on solar energy. Some homes are effectively trapping it as a heat source. Google has decided that it wants to be a driving source in the effort to develop technologies and systems that can convert solar power to electricity at a lower cost that what we presently spend using coal. We aren’t there yet.
I hope somebody is working on making two way meters cheap and abundant so we can all invest in our own solar panels and offset our electric bills soon.