Off the top of my head, here's a venture that's a result of a project going past the pilot phase:

https://holtecinternational.com/company/divisions/hi-power/

The physics is there. As for economics - there's a lot of low-hanging fruit to be picked in the peak-shaving market, where prices are very different from baseload, as Musk's famous 100-day from commissioning to completion battery showed.