Besides the mentioned NEE and iShares Clean Energy ETF, here’s a slow climber:
Algonquin Power and Utilities Group [AQN] ( Stock desc | Company profile | Latest news ).
Also check out Stock request: Ørsted and push the initiative for adding Danish stocks on here.
Hydrogen stocks such as ITM (and NEL ASA of course) are more like a Plan B for green energy investors. Cause Hydrogen is still mostly produced based on natural gas . There are plenty of papers etc. out there expressing doubts over the ‘renew-ability’/‘sustainability’ of that tech. Keep in mind: It’s obviously tremendously lobbied by the frightened gas industry.