There's also geothermal energy and tidal energy that can be used. Wind and solar are going to come into their own in this century, and I believe we will finally see batteries that can last longer and longer.

I would love to see everyone come off the grid and have a small power generator in their back yard. Power companies could lease them out to residents who don't want to be on the grid or completely replace the grid. Then they could recoup their earnings by repair work. It would do away with unsightly power lines and transfer stations we have everywhere.