Wind Turbines generate electrical power from the Martian winds. The amount generated depends on how powerful the winds are, so proper positioning is essential as higher ground tends to be windier.
While wind speeds on Mars are generally mild, they can reach incredible speeds during Dust Storms. Still, the thin Martian atmosphere dictates that the average wind turbine would need winds around six times more powerful than those on Earth to create the same amount of thrust.
This technological challenge to take advantage of what little wind there is on Mars was solved by opting for vertical axis wind turbines, which are capable of catching the wind from all direction, instead of simply horizontally. The materials used are light enough to self-start on much weaker forces then those most commonly used on Earth.