Siuchatar Substation, located near Kalanki in Kathmandu district, delivers power to Teku and Kalimati via a double bus system at 66kV and a single bus system at 132kV voltage levels. Kalanki, Swayambhu, Thankot, Balambu, and Tahachal are some of the names. In 1966, this substation was built with a 66kV twin busbar system to link with the Balaju and Hetauda substations. With the help of a Japanese government grant, one 66kV bay for Patan Circuit-I and two bays for a 66/11kV transformer with a capacity of 3x6MVA were built. During the building of the Kulekhani-ll Power House, one 66kV bay for Khulekhani-lI and one 66kV bay for Transformer with a capacity of 3x8.667/12.6MVA were built with Japanese assistance in 1979.In 1984, three 132kV line bays (Kulekhani-II, Balaju, and Marshyangdi) and one Transformer bay for 132/66kV, 3 x 12.6MVA Transformer were added to this substation. Similarly, the Kathmandu Valley Reinforcement Project built 66kV Line Bays for Patan-ll and Teku, as well as 132kV Bays, in 1984. The 66kV power cable that connects Siuchatar Substation to K3 Substation was built in 2004 thanks to a donation from the Japanese government. In 2008, the Grid Substation Re-inforcement Project built one 132/66kV Transformer Bay with a capacity of 3x8.667/12.6MVA to increase the Substation's Transformation capabilities. This Substation location houses the System Operation Department's office complex as well as the Load Dispatch Center. In 2019, a new 132/66 KV, 30 MVA transformer was installed. To avoid overload on 66 KV transmission lines, all 11 KV feeders are now fed by a 132/11 KV transformer.