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In conformity with the Malaysian Grid Code, TNB's Transmission Division is aimed at providing a safe, reliable and economical operation of the grid system.
The Division manages and operates the 132 kV, 275 kV and 500 kV transmission network of TNB known as the National Grid. Main activities of the Transmission Division include strategy formulation, system planning, engineering, project management, control operations, maintenance, way leave management and more.
The National Grid is interconnected to Thailand's transmission system operated by Electricity Generating Authority of Thailand (EGAT) in the North via a HVDC interconnection with a transmission capacity of 300 MW and a 132 kV HVAC overhead line with maximum transmission capacity of 80 MW. The National Grid is also connected to Singapore's transmission system at Senoko in the South via two 230 kV submarine cables with a firm transmission capacity of 200 MW.