Ardent Underground wins US patent for 150-tonne underground hydrogen storage system

[Attaqa] Ardent Underground, a company specialising in infrastructure, has obtained a US patent for an underground hydrogen storage system with a capacity of 150 tonnes, according to a press release obtained by the Attaqa energy platform. The company said the innovative solution would support the growing global push to cut emissions. The release did not disclose the patent number, technical details or a commercialisation timeline.