Fascism is a consequence of capitalism. Free (or very cheap) energy would not end capitalism outright, it would just reduce a cost in how profit is made.

The only hope for our collective future is socialist organizing. I highly recommend that anyone interested begin reading about the topic using books written by socialists and by joining a socislist organization or attending their events.

They said this about the rise of fission, electricity, steam power, computers. The extra production was either captured by capitalists, or simply didnt materialze. What’s different this time?

No, if you want to see that era of global prosperity, you need to address a lot of deep, fundamental issues that humanity has trouble even acknowledging let alone actually acting toward fixing. edit: Though, stopping fascism would be a necessary first step.

Techno fascism will occupy most of the output of nuclear fusion to power AI centers and build automated robotproducts. Sorry buddy, but nuclear fusion is Completely and directly playing into the techno fascists hands