While this article is about cars, there is another Chinese company that offers 50 MWh sodium-ion batteries for stationary energy storage.

While for cars sodium-ion batteries will never reach the energy per kilogram of the best lithium-ion batteries, for stationary use it makes absolutely no sense to use lithium batteries, because sodium batteries will become much cheaper when their production will be more mature, so they should always be preferred to lithium batteries.

Even for cars, sodium-ion batteries have a second advantage besides price, they retain their capacity and their charging speed down to much lower temperatures than lithium-ion batteries, so they will be preferred in cold climates.