Sand batteries aren't batteries - they output heat instead of electricity. You could use them to feed a steam turbine, but then you're paying for the steam turbine.
That said, sand batteries are amazing for the heat users who can use them - just plug em into some off-grid solar/wind (and/or on-grid, and make money by buying electricity when the prices go negative) and you get 24/7 heat for the price of intermittent renewables.
Sand batteries aren't batteries - they output heat instead of electricity. You could use them to feed a steam turbine, but then you're paying for the steam turbine.
That said, sand batteries are amazing for the heat users who can use them - just plug em into some off-grid solar/wind (and/or on-grid, and make money by buying electricity when the prices go negative) and you get 24/7 heat for the price of intermittent renewables.