Duhabi Substation with Double Bus System, located in Duhabi of Sunsari District in Koshi Zone , supplies electricity to Biratnagar, Innaruwa, Dharan and Duhabi. This substation is connected to Lahan and Kushaha substations by a 133 KV dual circuit and to Anarmani by a single circuit line. This substation was put into operation in 1985 with a capacity of 132/33 kV, 30 MVA. This substation was upgraded to 60 MVA, with an additional 30 MVA transformer installed in 1995. In 200 4, a 30 MVA transformer was replaced by a 63 MVA transformer. The replacement of another 30 MVA transformer with a 40 / 51.5 / 63 MVA transformer was completed in 2009. Capacitors with capacity 2x6.07 MVAR were installed in 1996 and 3x10 MVAR in 2003 to improve tension. by a dual circuit km long transmission line. The Kataiya power plant in India is also connected by a dual circuit 33 kV line. 132 / 33kV, 63MVA Another new Transformer Bay was installed in 2017