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 (-6.59%) (Tesla), $NEL (-1.72%) (Nel ASA), $HEX (+1.81%) (hexagon Composites), $PCELL (-3.5%) (PowerCell AB).

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