This is a vertical-axis wind turbine that rotates in different wind direction, thus ensuring electricity generation efficiently. You can stack this into three per pole to provide more energy and saving space. Materials for this is cheaper using plastics, which is lighter for stability and easier deployment.
Here is a render:
Vertical Axis Stacked Wind Turbine
As you can see, the upper half of the sketch is just tilted vertically to view the scale of the turbine. The bottom half of the render shows the side view and the top view.
This is basically the same principle as the weather apparatus used to measure wind speed.
Fernando L. Cuevas Jr.