The world's leading producers of large wind turbines used offshore, to 12MW currently, are all outside the US. Be interesting to see if an indigenous production capability develops.
https://www.offshorewind.biz/2020/02/14/nrel-unveils-15mw-reference-offshore-wind-turbine/
The configurations of the 15MW reference turbine go beyond the capabilities of the 10 to 12MW turbines already in development but are similar enough to serve as a baseline for 15 to 20MW next-generation designs, NREL said.
https://www.offshorewind.biz/2020/02/14/nrel-unveils-15mw-reference-offshore-wind-turbine/