The industry has been concentrated for many years now, and that hasn't really been a problem. There has been a recent influx of large engineering companies (GE buying the old Enron Wind in 2002, Siemens buying Bonus in 2003 and, more recently, Areva and Alstom entering the market, via respectively Multibrid and Ecotecnia), which is a good thing as this provides stronger balance sheets to what were until now farily small companies.

Note that some of the biggest players (notably the market leader, Vestas) are still "pure-plays", companies that do only wind turbines, like Gamesa, Suzlon/Repower or Enercon (that last one making by far the best turbines around, but refusing to sell them offshore because it cannot ensure its usual quality standards yet).

With the utilities coming in force on the buying side, the market is quite competitive and balanced - even though it structurally favors manufacturers right now as demand outstrips supply.

In the long run, we're all dead. John Maynard Keynes