It doesn't require that there actually be wind blowing, it works off hot air rising.
They built a test facility for it and are ready to go full scale with it.
Essentially it is a huge circular structure with a transparent roof(think greenhouse) that gently rises towards the center.
In the center is a very tall hollow structure, essentially a chimney, with wind turbines in it.
The idea is that air under the greenhouse structure heats up and rises through the chimney, providing the wind for the turbines.
Now here is the real kicker.
The project they propose will have a greenhouse structure that is 3 MILES in diameter, and if built as planned, the central chimney will be the tallest man made structure on the planet.
That is about 7 square MILES!
The proposed cost of the project is between 3 and 4 billion dollars.
The estimated peak electrical output is 300 Mwh during the day only, with some residual for a while after sunset as the thing cools down until the stack effect stops, at which point it generates 0 Mwh of electricity, even when it is windy.
Or for about the same money, they could build a nuclear plant on 10 acres of land that makes >1000 Mwh all day every day...