Using mines or running water for a source of energy

I've seen this done with an old mine out in the interior of British Columbia. Essentially, some fellow ran a turbine through an in-mine stream to generate electricity. Here's another use for an old mine: Geothermal energy

http://www.inhabitat.com/2008/12/10/heerlen-minewater-project/

Spray-on Solar Cells

You can now spray on solar cells:

http://www.livescience.com/technology/081106-tiny-solar-cells.html

Affordable Solar Panels

Solar panels have always been rather expensive. But there is some hope:

http://www.industryweek.com/ReadArticle.aspx?ArticleID=14932

I can only hope that by the time we're ready to build, that panels will be as common as dry-wall.