Er no? the premise was "this is how much power the EPS can handle spiking to the phasers under combat conditions". it is a system explicitly ignorant of all power consumption that is not the phasers, because it on face assumes all that has already been subtracted by default. And again, the in universe (Watsonian) explanation was explicitly "The EPS grid cannot move enough energy through it to power more than X phasers at once". total generation (rightfully so!) never even came into the equation at all.