Isn't this similar to the monetary meaning of the word turnover? Like turnover : profit <==> energy turnover : net energy output?
I lost money on the endeavor, though.
There has never been a net-positive-energy magnetic confinement fusion experiment. Inertial confinement fusion has had 2 events that were "more energy out of the fuel than delivered to the fuel." But is still about a factor of 100 away from what is needed for "more electricity in than out"