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 (+0,33 %) (Tesla), $NEL (-0,28 %) (Nel ASA), $HEX (+3,67 %) (hexagon Composites), $PCELL (+0,35 %) (PowerCell AB).

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