He's looking at almost a 21 year break even point (minus the tax credits, of course, so perhaps a 15 year break even point?)

Doesn't change the fact that he still HAS to be hooked up to the grid.

A good number of years ago I looked int wind power. At the time, it was $50,000 up front. I would've gotten some $20,000 in tax credits over a period of years.

I was iffy, but leaning that way, until I was told "the turbine will require a rebuild every 3-5 years, at a cost of $5,000, to $7,000.

Needless to say, at the time, there was a negative payback period. Meaning it would cost me more than paying the electric bill. A lot more.