Modern LED grow lights require minimum 35 watts per square foot to grow things beyond just lettuce, which is around 1.5 million watts per acre. Americans currently consume a bit over 2.5 acres of farmland produce per year, however you could get that down to 1 acre without much problem by cutting out some of the less land efficient crops likes fruit trees, especially when talking indoor grow.
So I would expect bare minimum energy requirements to be near 1.5-2 million watts per person for 12-16 hours a day for indoor food sustainability.
This is of course not accounting for fertilizer which has large energy requirements or anything more than the most simple and basic of climate control.
