Design News, Mar. 2014, by Rob Spiegel.
http://www.designnews.com/document.asp?doc_id=271886&dfpPParams=ind_182,aid_271886&dfpLayout=article

"For decades, renewable energy was the stepchild of the energy mix used to run [industrial] plants. Everyone thought clean energy was a good idea (how could you not?), but it was considered impractical, unreliable, and costly. Recent years have seen a sizable shift in that view. Between government subsidies, government mandates, and improved technology, alternative energies have elbowed their way to the big kids' table."