Thermal Power Plant No. 4 (Ulaanbaatar)

The Thermal Power Plant No. 4 (Улаанбаатарын ДЦС-4) is a coal-fired power station in Bayangol, Ulaanbaatar, Mongolia. With a total installed generation capacity of 663 MW, it is currently Mongolia's largest power station.

History
The first generating unit of the power station was commissioned in January 1983. All of the six generating units of the power plant were completed in 1991. In late 1990s, the power station began its overhaul project which were divided into two phases. The first phase which started in 1998 and completed in 2001, saw the revamping of its boiler no. 1 until boiler no. 4. The second phase which started in 2001 and completed in 2007, saw the revamping of its boiler no. 5 until boiler no. 8.

Technical specifications
The primary fuel for the power station is brown coal. It can also run on heavy fuel oil if there is a shortage on brown coal availability. It consist of eight boilers and six generating units, which are three 80 MW units and three 100 MW units, making it the largest power station in the country. In 2023, the power station used a total of 19.2 million m3 of water to generate power.