[philipkglass]

Hydrogen is stored underground in Texas salt formations at Clemens Dome, Moss Bluff, and Spindletop. The largest of them, Spindletop, was completed in 2017:

https://www.airliquide.com/sites/airliquide.com/files/2017/0...

This presentation says that the Spindletop hydrogen capacity is equivalent to ~120 GWh.

https://ukccsrc.ac.uk/wp-content/uploads/2020/05/John-Willia...