4 (Mongolian: 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.

[2] In late 1990s, the power station began its overhaul project which were divided into two phases.

[3] On 8 February 2017, the power station also received two emission analyzers from the Japan International Cooperation Agency to measure smoke and pollutant with a total cost of JPY37.6 million.

It can also run on heavy fuel oil if there is a shortage on brown coal availability.