Called Underground Gravity Energy Storage, the new technique proposes an effective long-term energy storage solution utilizing now-defunct mines.
"Mines already have the basic infrastructure and are connected to the power grid, which significantly reduces the cost and facilitates the implementation of UGES plants," Julian Hunt, a researcher in the IIASA Energy, Climate, and Environment Program and the lead author of the study,The primary components of UGES are the shaft, generator, upper and lower storage sites, and mining equipment. UGES generates electricity when the price is high by lowering sand into an underground mine.
"To decarbonize the economy, we need to rethink the energy system based on innovative solutions using existing resources. Turning abandoned mines into is one example of many solutions that exist around us, and we only need to change the way we deploy them," said Behnam Zakeri, study coauthor and a researcher in the IIASA Energy, Climate, and Environment Program.Low-carbon energy transitions taking place worldwide are primarily driven by the integration of renewable energy sources such as wind and solar power. These variable renewable energy sources require energy storage options to match energy demand reliably at different time scales.
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