The coal supply guarantee letter is issued by the Energy Bureau. According to relevant inquiries, the coal supply guarantee letter was issued by the Energy Bureau. In the National Energy Administration, the second-level bureau below the National Development and Reform Commission is at the deputy provincial and ministerial level, but most of the energy bureau directors are at the high-level administrative level, which is at the ministerial level. It consists of the General Department, the Legal Reform Department, the Planning Department, the Science and Technology Department, the Electric Power Department, the Nuclear Power Department, and the Coal Department.