Wind turbines harvest the power of the wind to create electricity. The wind turns the blades, which spin a shaft, which connects to a generator that supplies an electric current. As of 2010, the two basic types of wind turbines are used in wind energy systems are the traditional farm styled, horizontal--axis turbines and the eggbeater- style vertical turbines. The more common, traditional styled horizontal--axis wind turbines offer some advantages.
Horizontal-axis turbines offer the ability to adjust the pitch of the blades to catch the wind at just the right angle to collect the maximum amount of wind energy for the time of day and season.
The horizontal-axis turbine's inherently taller tower base enables unobstructed access to stronger winds, significantly increasing blade speed collection and resulting in higher power output.
Efficiency of Operation
Horizontal-axis wind turbines have blades that are designed perpendicular to the direction of wind.This efficient design increases wind power throughout the entire rotation. In contrast, vertical-axis wind turbines require airfoil surfaces to backtrack against the wind for part of the cycle in a less efficient manner.