Vertical wind engines are pretty seldom, but they are actually the best alternative. They can produce wind energy in such a wide scale as the horizontal ones, but if we look forward to creating a sustainable wind energy system we have to look more for small and practical local solutions. Vertical engines are more effective under such conditions: they start to move from less wind, they are lighter, their centre of gravity is lower, because of the lower set engine and thus they don’t need such a solid base as the horizontal ones. And they don’t need much free space and are not dangerous for bird. The horizontal ones have no natural movements, so they are almost invisible for bird and kill millions of them. A nice business idea is to improve the vertical wind engines further and to build them for private households as a local solution.