Its al least 10 years out. More because of the many EPA regulations, permits & licensees etc, enviro-wacko lawsuits, and the fact that they have not succeeded in scaling it up. Then they would have to actually build one so add more years for permits lawsuits licenses regulations building inspectors inspections.
Which will happen first?
1. US Men’s Soccer Team wins the World Cup
2. Fusion reactors begin to power the electric grid