Deep underground energy storage is the use of deep underground spaces for large-scale energy storage, which is an important way to provide a stable supply of clean energy, enable a strategic petroleum reserve, and promote the peak shaving of natural gas.
arch have been conducted on the effects of hydrogen injection in natural gas networks (DBI-GUT, 2017).Another orm of large-scale underground energy storage that could contribute to the security of supply is CAES. At times of excess production
Large-scale energy storage is possible via various technologies. Underground storage is operated commercially in several parts of the UK, where large caverns in halite have been developed and store various products including natural gas and hydrogen. There is the potential for energy to be stored in similar caverns as compressed air
Underground Thermal Energy Storage (UTES) A thermal energy storage is a system that can store thermal energy by cooling, heating, melting, solidifying or vaporizing a material , such as hot-water, molten-salt or a phase-change material. Sensible heat storage (SHS) relies on the temperature variation of a solid or liquid (e.g. water).
The site selection for underground energy storage is dependent upon several factors, mainly related to geological and engineering issues, such as: the type of candidate rocks, structural issues, tectonics and seismicity issues, hydrogeological and geothermal issues and also geotechnical criteria.
The technologies considered in this article are: Underground Gas Storage (UGS), Underground Hydrogen Storage (UHS), Compressed Air Energy Storage (CAES), Underground Pumped Hydro Storage (UPHS) and Underground Thermal Energy Storage (UTES).