There's a startup incubator West of Lansing, Michigan in the little town of Grand Ledge called The Fledge http://grandledgefledge.com/ It's really a cross between a makerspace and an incubator.

I toured there and among the projects I saw was someone who had made a Tesla Powerwall from laptop batteries. Another was a solar array on a trailer which they explained could be shuttled between your house as well as a cottage up North.

Course building a project is less than half the journey to successfully commercializing it however it was inspiring to see what people were creating.