The underground space resources of abandoned coal mines in China are quite abundant, and the research and development of underground space energy storage technology in coal mines have many benefits.
6.1. CUEES concept and technical requirements Coal Underground space Electrochemical Energy Storage (CUEES) makes full use of the underground space of coal mining to store or release electrical energy (various types of batteries) through reversible chemical reactions, so as to achieve efficient use of electrical energy, as shown in Fig. 20 .
Coal underground thermal energy storage (CUTES) is a form of energy storage that makes extensive use of the underground highways in closed mines as a place to store energy and to offer heating and cooling in the winter and summer months, respectively.
(1) Establish strict environmental protection standards and emission limits to ensure that coal mine energy storage facilities do not have a negative impact on the environment. (2) Establish a safety supervision mechanism to ensure the safe operation of coal mine energy storage facilities, and formulate necessary safety standards and norms.
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