Do you mean the nacelles?
If my 35 year ago experience in composites is anything to go by, then it could be, in part, material prices.
I had a run in with ICI about chemical prices becuase I could get the components made in India, then delivered to any European site, cheaper than I could buy the materials. The Indians were using the exact same materials, made in the same plant at Teeside.
Out of spite, and because EU free trade started, I changed to a German made polymer.