Transmission Lines Fire and flood safety around transmission towers and lines. Powerlink's high voltage network extends 1,700km from north of Cairns to New South Wales, comprising of 15,337 circuit kilometres of transmission lines. Learn more Guidelines & Procedures Powerlink's safety guidelines and procedures are consistent with the Energy Networks Australia (ENA) National Guidelines, and support the objectives of the National Electricity Safety Code. Learn more Electric & Magnetic Fields Electric and magnetic fields are found everywhere electricity or electrical equipment is being used – including in the home, office, work sites and around transmission lines. Learn more