Advantages of vertical axis wind
turbines VAWTs offer a number of advantages
over traditional horizontal
axis wind turbines (HAWTs).
They can be packed closer together
in wind farms, allowing
more in a given space.
In counter-rotating configurations, turbines
can extract energy from the wakes of adjacent turbines.
With HAWTs,
this is not possible and the turbines
must be kept farther apart.
VAWTs are rugged, quiet, omni-directional,
and they do not create
as much stress on the support structure.
They do not require
as much wind to
generate power, thus allowing them
to be closer to the ground.

By being closer to the ground they are easily
maintained and can be installed
on chimneys and similar tall structures.