Someone in China drew an interesting picture of a slow rotating skyscraper shaped like a vertical axle wind turbine. Tall but the proportions of a bucket. Say s

Someone in China drew an interesting picture of a slow rotating skyscraper shaped like a vertical axle wind turbine. Tall but the proportions of a bucket. Say such a thing has half a million ton in mass and 500 m diameter. The fun part is that losses are less than zero if there is some wind.