BOP for your windfarm proposal what if capital was put forth by a group to say put a solar power system on JOE BLOWS roof.  Then He pays into the Co-op what he would normally pay the power company at the original KW hour price.  The Co op uses his wasted sunlight (or wind same priciple) and he secures constant price of energy.  since his system would be based on his need everything is god. A few years down the line when his system pays for itself he gets say 25%off. The Contract would have to attach to the deed and carry with a sale.

Against point #2 you can't rule out a dead end except in rare occasions (alchemy) some things are possible even though thought otherwise. I might be wrong fusion might not be possible but at this point I think it is not proven so.