A wind turbine is a device that converts the wind's kinetic energy into electrical power. Wind turbines are manufactured in a wide range of vertical and horizontal axis types. A wind turbine shall be marked and/or lighted if it is determined to be an obstacle.
• The number of light levels recommended depends on the height of the structure;
• The obstacle lights should be installed on the nacelle to provide an unobstructed view for aircraft approaching from any direction;
• Lights are applied to identify the perimeter of the wind farm;
• The diameter of the structure determine the number of lights installed at the top and at each light level.
When lighting is deemed necessary, medium-intensity obstacle lights should be used.
In the case of a wind farm, i.e. a group of two or more wind turbines, it should be regarded as an extensive object and the lights should be installed:
1. to identify the perimeter of the wind farm;
2. respecting the maximum spacing of 900 m, between the lights along the perimeter, unless a dedicated assessment shows that a greater spacing can be used;
3. so that, where flashing lights are used, they flash simultaneously; and
4. so that, within a wind farm, any wind turbines of significantly higher elevation are also identified wherever they are located.