Meh, this article really only discusses lithium ion and lead acid batteries. It is well known both of these are abysmal for grid storage, and are at best relatively expensive solutions for mobile energy.

There are already several energy storage solutions that are starting to be installed that aren’t these and that are far more cost effective. Flow batteries are an example. For the same cost as lithium ion we get 3x the energy storage and 3x the lifespan (and are essentially 100% refurbishable) for the same cost. They just come at a price of weight and volume (which isn’t a problem for most grid or residential storage). There are others as well.

The article does do a good job talking about thermal as a solution, and this is very true. They don’t talk about high temperature thermal energy storage, though that is admittedly more of an industrial use case.