China decided to close the last four coal-fired power and heating plants out of Beijing's municipal area, replacing them with gas-fired stations, in an effort to improve air quality in the capital. The four plants, owned by Huaneng Power International, Datang International Power Generation Co Ltd, China Shenhua Energy and Beijing Jingneng Thermal Power Co Ltd, had a total power generating capacity of about 2.7 gigawatts (GW). The first power plant closed in 2014, two other ones in 2015 and the last one will close in 2017.[49]