Vertical-Axis Wind Turbines

Vertical-axis wind turbines,
. . . have a number of advantages over tradition horizontal-axis ones.
. . . . . . They are always oriented towards the wind, and
. . . because their mechanical parts are at ground level, and
. . . . . . not atop a high mast, repair and maintenance work,
. . . . . . can be performed at a much lower cost, even thou
. . . But some studies point at the heightened sensitivity to mechanical wear.

2014-04-13 Source:  Vertical-axis wind turbines