Though they are also poised to get iron ore refining to work. That alone could be worth a bunch (numbers assuming 20y amortization and 30% average duty cycle (using only summer surplus) suggest around 10ct/kg iron metal capex plus 3 kWh/kg iron metal electricity).

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hnaccount_rng 5 days ago | parent [-]

How do these numbers compare with traditional methods?

	▲	0cf8612b2e1e 5 days ago \| parent [-]
		I have not seen much data on these designs, but conceptually they should be cheap. Require holding tanks and iron. No high pressures or other exotic requirements. Round trip efficiency is way worse than lithium, but that might not be meaningful for grid batteries. You just want something that cheaply scales.