The Baganuur–Choir Transmission Line is a transmission line in Mongolia connecting Baganuur of Ulaanbaatar and Choir of Govisümber Province. History. The transmission line was constructed in the 1980s. The 220/110/35 kV Baganuur Substation was established in 1983. In 2019, the 220/110/35/6 kV Choir Substation was expanded and renovated. Geography. The elevation along the transmission line ranges from 1,280 until 1,480 meters, with the highest point located in Baganuur District and the lowest point located in Choir city. Technical specifications. The transmisison line is a single circuit with a voltage rating of 110 kV. The transmission line starting point is at the 220/110/35 kV Baganuur Substation and the ending is at the 220/110/35/6 kV Choir Substation.