Section 2(1)(m) in Bihar Electricity Regulatory Commission (Licencing for Transmission of Electricity) Regulations, 2007
(m)"Transmission System" means a network of interconnected extra high voltage electric lines (overhead lines and cables, transformers, switchgear and other associated equipment and apparatus) owned or controlled by the transmission licensee for connecting various generating stations and sub stations and distribution system for the purpose of conveyance of electricity.