SPARC will also not produce net power gain, as far as I know. They are planning to achieve "breakeven", which is energy going into plasma < energy of plasma, promising Q > 2, with an optimistic expectation of Q ~ 10. But best estimates for plasma energy -> electrical energy conversions are 50% efficiency, and energy going into plasma is typically many times smaller than the amount of energy drawn from the grid (couldn't find any numbers for SPARC).
SPARC doesn't seem to publish such numbers, but ITER, which is aiming for Q ~ 10 is going to be nowhere near to generating net energy, so SPARC's 2 < Q < 10 is unlikely to be able to do it either.
SPARC doesn't seem to publish such numbers, but ITER, which is aiming for Q ~ 10 is going to be nowhere near to generating net energy, so SPARC's 2 < Q < 10 is unlikely to be able to do it either.
Edit: ITER is also going for Q~=10