There are several key roles, including Power Line Technician, Transmission Engineer, and Line Installer and Repairer. These professionals are responsible for the installation, maintenance, and repair of overhead and underground power lines, substations, and other electrical infrastructure. This includes working with high-voltage equipment, troubleshooting faults, ensuring safety, and performing routine inspections. For engineers, responsibilities also include designing new transmission systems, planning project routes, and ensuring projects comply with safety and environmental standards.