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 (+6,49 %) (Tesla), $NEL (+0,25 %) (Nel ASA), $HEX (+1,94 %) (hexagon Composites), $PCELL (-2,08 %) (PowerCell AB).

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