We make Windmills here!

And then pop them up out at sea.
And Boy! are they big ones! just look at the upright sections behind the ship, they are over 200 feet high .
Took this on my morning Ebike ride
To give you an idea of the size of the "Windmills"

 Siemens Wind Power 7 MW turbines with 154 metres (505 ft) rotor turbines 
150 metres (490 ft) tip height above mean sea level. ... 1.2 billion Euros will go to Siemens for turbines and electrical connections.
And   around 171 turbines will be used for phase 1 of  the wind farm

They are colossal!