Huaneng International Power Co., Ltd.: Huaneng International, as one of the largest comprehensive energy service providers in China, involves coal, hydropower, nuclear power and other fields, so it needs a lot of rubidium as a material.
China Shenhua Energy Co., Ltd.: Shenhua is one of the largest coal mining enterprises in China and one of the largest coal producers in the world. Rubidium is needed in mining, chemical industry and other fields.