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A near 100pct renewable grid for Australia is feasible and affordable, with just a few hours of storage
(reneweconomy.com.au)
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I thought molten salt storage gets like 90% efficiency. What's the advantage of storing energy by cooling blocks?
To run a heat engine you need a temperature difference in order to generate work. When your system generates heat as a byproduct you can amplify the amount of work by increasing the temperature difference. This is how the cold block "stores" energy.
What's your source on 90% efficiency? Here it's stated 35% max.
I'm just talking about storage. Molten salt energy storage is mentioned here: https://en.wikipedia.org/wiki/Thermal_energy_storage