No no no.
We are talking 20 METERS diameter, not feet to get 200kW plus out of it.
You are talking about a wind turbine design that will require very modern materials (composites), a 12 meter long autoclave, a machine shop that can manufacture a center hub about 4 feet across and a motor-driven yaw bearing system also several feet across. The rotor assembly will weigh a ton (or more, not exaggerating!) and will require a special bearing system of its own.
This is an 80KW wind turbine with 18 meter blades: