On October 15, my birthday, a coalition of community-choice aggregators in California released the first major request for proposals targeting long-duration projects. It puts real money on the table to build long-duration projects, which will then establish a market value for the technology and show the world that it’s ready for prime time.
Companies interested in this process cover a range of technologies, including pumped hydro, gravity-based, compressed air and flow batteries, as well as current market leader lithium-ion batteries.
Have a look at this very good article from GTM here.