Stationary storage is a lot more flexible in what chemistries they can use because they don't need to optimize for mass. The article even mentions one bidder of

Stationary storage is a lot more flexible in what chemistries they can use because they don't need to optimize for mass. The article even mentions one bidder offering redox flow batteries which have scaling properties which are much better for grid storage than for cars, so they wouldn't compete for resources with the latter.