Yes it has. For example JET achived 16 MW of fusion power output in 1997. (https://en.wikipedia.org/wiki/Joint_European_Torus https://en.wikipedia.org/wiki/Join

Yes it has. For example JET achived 16 MW of fusion power output in 1997. (https://en.wikipedia.org/wiki/Joint_European_Torus https://en.wikipedia.org/wiki/Joint_European_Torus) Its successor, ITER is supposed to produce more energy than used in creating the fusion process. It is still under construction in France.