#solar Energy People:
https://www.indiatimes.com/technology/science-and-future/molecular-solar-thermal-energy-storage-system-18-years-537247.html "Researchers Develop Liquid That Absorbs And Stores Solar Energy For 18 Years", Monit Khanna Updated on Mar 29, 2021, 14:52 IST.
Chalmers University of Technology in Sweden made a liquid called MOST (Molecular Solar Thermal Energy Storage System) which you can store 250 watt hours of energy per kilogram of liquid (twice as good as a tesla battery), holds for 18 years.
Unsure what its made *from* or how intensive it is to make, research continues.
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