Riches In The Niches - Energy Efficiency?

[Ryan Dalton]

So I was wondering if anyone has ever flipped and aimed for energy efficiency as a primary selling point?

I was researching geothermal heating/cooling a few months ago and would love it in my primary residence one day.  It sparked the idea of flipping on the basis of energy efficiency. 

Has anyone ever taken geothermal, solar, etc. forms of energy into a flip and done well with it?  Unfortunately I've seen very wide, big numbers for geothermal (between $20,000-50,000).  It would be incredible to have a home where your electric bill looked like a water bill.  That would justify a much more expensive home in my opinion.  

Anyone have any experience with this?

Thanks!