China's Mingyang unveils world-first 30MW pure hydrogen electricity generator

[Trexmaster]

3. A missing detail that I don't enjoy about the threads of green energy & meta-discussions about green energy overall

What happened with dynamos?
What happened with magnetos?
What happened with alternators?

Did magnets vanished or something?

Hydropower – we've exhausted the possibilities wherever it could have been done, now people are worrying about dams collapsing.

Aeropower – I think a lot more can be done but during specific seasons in different climates (ex. winter), they're dead.

Solarpower – This too still has more to cover, though I understand that – just like wind power – the maintenance side will be a doozy medium-to-long term.

[Geo]Thermopower – This can be done in specific areas on the globe and can only be harnessed if you drill for it, essentially. There is another method than conventional drilling nowadays but I'd reckon the NO1 concern will be about earthquakes that could close the tunnels deep underground, the shafts.


So back to my question, did permanent magnets vanished? Is the technology stuck and limited in output?