One striking moment at the conference was the call from both Vestas and Areva Renewables for "predictability" within support schemes and overall policy, so that investments can take place. It were as if energy policy, commitment to emissions reductions, Kyoto had never happened and that renewable market was a fringe operation.

the main reason there is not enough manufacturing capacity is because the US has an appalling track record in supporting the industry: 3 times over the past decade, Congress allowed the main regulatory instrument, the PTC, to elapse, causing a catastrophic drop in installations:

...

There is no secret: the only way to have manufacturing investment in an industry which needs no subsidies, but a specific regulatory framework is to have stable policies and, dare I say it, an industrial policy to promote both the wind industry (a good thing in itself) and the wind turbine manufacturing industry.