How do those things pay for themselves? I assume the big ones still cost more than $1.5M installed. If I take out all those delivery charges from my bill it looks like I'm paying $0.08/KWHr. That means a 1500KW unit makes $120/hr in good winds. Even if its yearly average is 25% of that (which I doubt) it's only making $263K/yr. Add in maintenance costs and the interest you could have made with the investment and I don't see how they ever break even.
Good old government subsidies and it helps if you pay cash for everything. My company is planning to have an additional 1000MW added to the portfolio by the end of 2012.