ITER fusion reactor to see further delays, with operations pushed to 2034

https://en.wikipedia.org/wiki/Muon-catalyzed_fusion

There is one company trying it:

https://www.acceleron.energy/

Muon production efficiency optimization is a worthwhile engineering problem. The accelerator needed to make the muons can already be made more efficient than assumed in the classic papers.

Muon-catalyzed fusion does not require the unlikely combination of 100M degree plasma generating huge power right next to cryogenic superconducting magnets.

Muon-catalyzed fusion can already run continuously, unlike plasma fusion. There is none of this "it can run for x seconds" nonsense.

The efficiency needs to be greater than 1, but all parts of the power plant are included in this calculation. So, for example, making a more efficient steam turbine helps. So consider..

A tritium breeding blanket is needed for all kinds of D-T fusion including plasma to locally make the tritium fuel from the fusion neutrons. If you include U-238 in it, you double the power output thanks to all of the resulting fissions.. just as in an H-bomb. This could push the plant efficiency above 1..