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 (-4.58%) (Tesla), $NEL (-0.43%) (Nel ASA), $HEX (-0.82%) (hexagon Composites), $PCELL (+4.26%) (PowerCell AB).

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