/technologies/power-management/b/blog/posts/world-wide-wind-s-counter-rotating-turbines-set-to-begin-testingThe company’s unique turbine design uses a pair of counter-rotating blades on a vertical axis and places the generator at the bottom of the structure, allowing the turbine to tilt in the wind. (Image credit: World Wide Wind ) World Wide Wind ha...en-USTelligent Community 12