Recently Phys.Org has had 2 articles about small inexpensive fusion reactors that are in work.

The first is UW fusion reactor concept could be cheaper than coal.

The seconds is from Lockheed Lockheed Martin pursues compact fusion reactor concept

Lockheed hopes to have a prototype running in 5 years. The prototype would be able to sustain a fusion reaction for 10 seconds. That doesn't sound very long but it is way more than anything that is in work right now. If they can get that then it will be a huge step towards a real fusion energy source.

Of course fusion energy has been 10 years away for about 50 years now.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.