The press release contained current and next years prices - 200$/kWh @ 8hr storage is the current cost of flow storage.
Its not really sensible to price 24hrs of li-on storage considering li-ons charge/discharge rate capability is fixed. There is no use for the capability to charge and discharge 24hours of power within a couple of hours, but you cant avoid buying it with li-on. With flow batteries you price the discharge rate and the capacity separately. This is why flow batteries should work out a fraction of the cost even at todays price.
Its not really sensible to price 24hrs of li-on storage considering li-ons charge/discharge rate capability is fixed. There is no use for the capability to charge and discharge 24hours of power within a couple of hours, but you cant avoid buying it with li-on. With flow batteries you price the discharge rate and the capacity separately. This is why flow batteries should work out a fraction of the cost even at todays price.