National Grid, Malaysia () is the high-voltage electric power transmission network in Peninsular Malaysia. It is operated and owned by Tenaga Nasional Berhad (TNB) by its Transmission Division. There are two other electrical grids in Sabah and Sarawak operated by Sabah Electricity Sdn Bhd (SESB) and Sarawak Energy Berhad (SEB) respectively. The system spans the whole of Peninsular Malaysia, transporting electricity in bulk from power generators owned by TNB and Independent Power Producers (IPPs) to distributors. The grid also transports directly to large industrial customers, such as steel mills and fertilizer plants. Malaysia's national electricity grid system is weakly prepared to accommodate the expanding production of electricity from renewable energy. History The beginnings of the National Grid was slowly taking shape in 1964 when the Bangsar Power Station was connected to the Connaught Bridge Power Station, with the line subsequently extended to Malacca. By 1965, a plan was set to connect the electricity generating plants that were spread out all over the country. Plants identified to be linked were located at Paka in Terengganu, Temengor, Kenering, Bersia and Batang Padang in Perak, Connaught Bridge, Kapar and Serdang in Selangor, Cameron Highlands in Pahang, Perai in Penang, Port Dickson in Negeri Sembilan, Pergau in Kelantan, Pasir Gudang in Johor and in Malacca. The central area network with Connaught Bridge Power Station in Klang was the precursor of the energy grid; it also tapped into the Cameron Highlands Hydro scheme from the Sultan Yussuf Power Station, and was extended into a western network. Late in the 1980s, the loop was complete when Kota Bharu joined the grid. Grid description Transmission system More than 420 transmission substations in the Peninsular Malaysia, with a total installed capacity of 105,305 MVA, are linked together by approximately 21,000 circuit-kilometers of overhead lines and underground cables operating at 132, 275 and 500 kilovolts (kV). The 500 kV transmission system is the single largest transmission system to be ever developed in Malaysia. Begun in 1994, Phase 1 involved the design and construction of the 500kV overhead lines from Gurun, Kedah in the North along the west coast to Kapar, in the central region and from Pasir Gudang to Yong Peng in the south of Peninsular Malaysia. The total distance covered for the 500 kV transmission lines is 784 circuit-km and the 275 kV portion is 9,257 circuit-km as of February 2017. To cater for the new plant up