https://www.oxfordenergy.org/wpcms/wp-content/uploads/2020/1...
https://www.nj.gov/dep/njgs/enviroed/infocirc/StorCavsIC.pdf (Control-F "Repauno Works")
TLDR It is a superior long duration liquid energy storage system vs hydrogen.
https://pubs.acs.org/doi/10.1021/acssuschemeng.7b02219