PEM facilities are the most promising option for pairing H2 production with solar and wind generation as the low level of partial load required by the electrolyzers and their ability to rapid cycle makes them suitable for running on intermittent power sources.
The full story can be found here: https://www.pemedianetwork.com/hydrogen-economist/articles/green-hydrogen/2022/pem-electrolyser-technology-gaining-favour/?id=2438085