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 (+0,86 %) (Tesla), $NEL (+0,32 %) (Nel ASA), $HEX (+5 %) (hexagon Composites), $PCELL (+3,58 %) (PowerCell AB).

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