Cheaper than renewables? 100 million degrees doesn't sound cheap, and frankly fusion power has been "coming in the next 10 years" at least since I was at school and I'm in my mid-forties.

[–] nBodyProblem 13 points 8 months ago (1 children)

The usual joke is that fusion is always “30 years away”, not 10. The reason is that fusion projects have historically faced an issue where funding is chronically below predictions

However, this past decade is seeing a number of promising changes that make fusion seem much closer than it ever has. Lawrence Livermore managed to produce net energy gain in a fusion reaction for the first time. Fusion startups are receiving historical levels of VC funding. ITER is expected to produce as much as ten times as much energy as used to start the reaction. The rise of private space infrastructure is making helium-3 mining on the moon more possible than ever before.

[–] [email protected] 1 points 8 months ago (2 children)

But technical issues aside, does that sound financially viable as a source of energy?

Even regular fission has fallen out of favour due to cost, and that's basically just hot rocks. Harnessing a miniature sun using gas mined on the moon sounds ludicrous in comparison.

[–] nBodyProblem 7 points 8 months ago

It certainly has the potential to be. Remember most of the costs related to fission are safety measures, plant decommissioning, and waste disposal. If we merely had to operate the reactor without concern for those issues, fission would be incredibly cheap. The fuel costs and basic technical requirements to operate a reactor are trivial in comparison.

Fusion produced 4x more energy per mass of fuel compared to fission, isn’t at risk of meltdown, and has the potential to produce negligible radioactive byproducts. In addition, it outputs helium which is an important and finite strategic resource.

Even if the cost of fuel goes up dramatically compared to uranium reactors, it might still outperform nuclear in a big way. However, sourcing He-3 from the moon might be a lot cheaper than you think. My day job is related to space resource utilization. Transporting resources off the surface of the moon could be quite economical once we reach a sufficient level of development.

[–] [email protected] 0 points 8 months ago* (last edited 8 months ago)

Much like the IRA attempting to kill Thatcher, we can fail to achieve unclear fusion as many times as we want, but we only need to succeed once.