Large birds such as swans and geese sometimes collide with overhead line conductors in poor visibility, resulting in their injury or death.

Where bird collision has been identified as a problem then in some circumstances line marking devices can be fitted to increase a line’s visibility.

Overhead line towers are sometimes adopted by birds as convenient structures upon which to roost, often in significant numbers.

Where bird fouling is a problem a number of methods to dissuade birds from roosting on towers may be used. The effectiveness of the bird scaring is monitored in conjunction with grantors and wayleave officers