But beyond the Olympian visions of ever more powerful mega-machines, a market for medium-sized turbines for both offshore and land-based wind farms is fast taking shape.

Siemens is launching a souped-up version of its 3.6MW turbine for shallow-water offshore developments; GE has a bigger-bladed, taller-tower 2.5MW machine for forested low-wind locations; and Nordex is targeting medium- and high-wind sites in Europe with new 3MW and 3.3MW