The US National Ignition Facility has achieved even higher energy yields since breaking even for the first time in 2022, but a practical fusion reactor is still a long way off
I believe the general principal is giving such a device “seed energy” to get it started, then just feeding the power it produces back into itself. The only time you’d ever need that solar farm is to get it started.
You could also pump that energy into other fusion reactors to get “unlimited energy” so to speak.