Currently less available of all the three main electrolyser technologies, solid oxide electrolysers utilise both electricity and high temperature to produce green hydrogen. This unique feature makes it potentially more advantageous for industrial sites seeking to decarbonise. But this Topsoe production site might just help make the units more prevalent!
https://globalenergyprize.org/en/2022/09/06/the-worlds-largest-electrolyser-plant/