What do you think about hydrogen stocks, i.e. production processing and storage?

I have the following stocks in mind at the moment:

$BAS (Basf De), $RCK (Rock Tech), $TSLA (+1.75%) (Tesla), $NEL (+1.05%) (Nel ASA), $HEX (+0.3%) (hexagon Composites), $PCELL (+0.65%) (PowerCell AB).

Or do you have any other suggestions which companies to keep an eye on in the current energy transition?