In the 70s there were designs from NASA and Growian of MW size but they were not successful.

WONDERS OF COMMUNITY PARTICIPATION IN WINDMILL

The TvindMill (Tvind Møllen, Skorkærvej 8, Tvind, 6990 Ulfborg , Denmark) is one of the biggest windmills in the world (54 m). It is an impressive building, constructed by the pupils of the school with the advice of experts.

The construction of the mill started in 1975, and today the mill supplies the many school-buildings with electricity.
There is a lift inside which takes people to the top. It is a tourist attraction. I visited visited the Wind Turbine thrice when I worked in.
Tvindkraft was created to show the way forward for wind energy – and to show the way out for nuclear power. But the most important thing was probably that the Teacher Group showed that it was possible for normal people, without any significant scientific education, to build a large wind power plant. With their determination, their drive, their elbow grease and common sense, cooperation and support, where help was to be found, this unparalleled structure was created – despite comments like: “You are doing wind power a disservice by trying to build a windmill”, and despite the fact that no authority wanted to give any financial assistance to the windmill construction, although it clearly followed the recommendations of the ‘Akademiet for Teknisk Videnskaber’ [Academy for Technical Sciences] to promote the development of wind energy in Denmark, with both practical experiments as well as research projects.
Tvindmill is a Downwind Turbine
Upwind Vs Downwind Turbines:
An Upwind turbine faces into the wind with the turbine blades in front of the Nacelle while a Downwind turbine has blades to the rear of the Nacelle and faces away from the wind. Up-wind turbines are by far and away the most common, but down-wind turbines (usually two-bladed) are also used in certain situations.
Incidentally in India few Downwind Turbines were installed.

Dr.A.Jagadeesh Nellore(AP),India
Wind Energy Expert
E-mail: anumakonda.jagadeesh@gmail.com