There are other alternative technologies to store energy as heat, in particular molten silicon: - https://reneweconomy.com.au/mit-team-gains-ground-on-molten-s

There are other alternative technologies to store energy as heat, in particular molten silicon: - https://reneweconomy.com.au/mit-team-gains-ground-on-molten-silicon-energy-storage-concept-23077/ https://reneweconomy.com.au/mit-team-gains-ground-on-molten-... - https://1414degrees.com.au/ https://1414degrees.com.au/ (which looks like a competitor for malta)