Can abandoned mines be used for energy storage?
Closed mines can be used for the implementation of plants of energy generation with low environmental impact. This paper explores the use of abandoned mines for Underground Pumped Hydroelectric Energy Storage (UPHES), Compressed Air Energy Storage (CAES) plants and geothermal applications.
How reliable are compressed air systems in underground mining operations?
Most of the past studies have focused on reduction of the power consumption through optimization of the produced compressed air flow. However, there is little reported work to analyze the availability and reliability of compressed air systems in underground mining operations.
What are underground energy storage and geothermal applications?
Underground energy storage and geothermal applications are applicable to closed underground mines. Usually, UPHES and geothermal applications are proposed at closed coal mines, and CAES plants also are analyzed in abandoned salt mines. Geothermal power plants require flooded mines, which generally have closed more than 5 years ago.
How can abandoned mine facilities be used to generate energy?
Finally, a CAES plant could be established, using the upper mine galleries for underground air storage; the fact that Lieres is a “dry mine” is ideal for this type of system. Thus, the abandoned mine facilities are efficiently used to generate both electrical and thermal renewable energy. Fig. 5.
Where is compressed air stored?
Compressed air is usually stored underground in salt caverns, hard rock caverns (more prevalent), voids or porous rock formations (saline aquifers) . In Europe, the underground storage in abandoned limestone or coal mines, which have the potential to be outstanding storage sites, is considered [66, 67].
Why are energy storage systems needed?
Energy storage systems are required to increase the share of renewable energy. Closed mines can be used for underground energy storage and geothermal generation. Underground closed mines can be used as lower water reservoir for UPHES. CAES systems store energy in the form of compressed air in an underground reservoir.
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