If you see or hear low-flying choppers in the sky in the next few days, don't be alarmed.
Ausgrid specialist crews are beginning the annual aerial patrols to inspect the electricity network for any potential bushfire hazards.
From June 27, two helicopters will be flying above powerlines across areas including south-west Sydney.
The specialist crews will be using laser scanning equipment and taking high-resolution photographs to identify any hazards on poles and wires, and trees growing too close to powerlines.
The helicopters fly between 15 and 35 kilometres per hour and have been modified to allow for the quietest possible operation but they may fly low at times.
Ausgrid chief operating officer Trevor Armstrong said after completing surveys of the Hunter and parts of the Central Coast the patrols are now moving into densely populated parts of Sydney.
"Safety is our highest priority and these patrols are a key part of our annual bushfire safety program to help identify and rectify any potential defects that might pose a bushfire risk," he said.
"This year we have contracted two specialist helicopters to allow the patrols to be finished by the end of June, well before the start of the next bushfire season in September."
The helicopter flights are the safest and most efficient way to inspect high-voltage powerlines and Ausgrid will remove or repair any hazards identified on our network during and soon after the patrols.
"The patrols reduce safety risks for our own people, because by using a helicopter, we can identify potentially dangerous hazards from above without putting our workers at risk," Mr Armstrong said.
"Using the photographs means our own workers don't need to be placed in a position of having to examine damaged equipment up close."
Crews will be in the air from about 7.30am to 5.30pm (weather permitting).
More information here.