Target that clean heating rate should increase to 50% in the northern area by 2019 and 70% by 2021. In the “2+26” key cities and districts, 90% of heating services should use clean energy sources by 2019 and 100% by 2021. At the same time, the Chinese government calls for large-scale renewable energy deployment in clean heating, building energy efficiency to improve, and renewable energy resources to contribute more to clean heating. The “2+26” cities refer to cities located along the pathway through which air pollution in the Beijing-Tianjin-Hebei region transmits. Beijing and Tianjin are the “2”, and the “26” include Shijiazhuang, Tangshan, Langfang, Baoding, Cangzhou, Hengshui, Xingtai, and Handan in Hebei Province; Taiyuan, Yangquan, Changzhi, and Jincheng in Shanxi Province; Jinan, Zibo, Jining, Dezhou, Liaocheng, Binzhou, and Heze in Shandong Province; and Zhengzhou, Kaifeng, Anyang, Hebi, Xinxiang, Jiaozuo, and Puyang in Henan Province.