Form Energy seems to be landing new pilot projects with US utilities. Form Energy is an American energy storage company focused on developing a new class of cost-effective, multi-day energy storage systems that will enable a reliable and fully-renewable electric grid year-round. Form Energy's first commercial product is a rechargeable iron-air battery capable of storing electricity for 100 hours at system costs competitive with legacy power plants. [1]

[1] https://en.wikipedia.org/wiki/Form_Energy