The capital investment required to grow corn indoors would be enormous relative to the per bushel cost. I reckon the operational cost would even outweigh the revenue.

Average corn yields in Iowa were 205 bushels per acre in 2021. Let's say corn is $10 a bushel (trading around $7 on the spot market right now). So $2050 per acre for conventional ag.

Let's assume 4x yield for indoor production, so roughly 1000 bushels/acre. Or $10k per acre at $10.

I had trouble finding any good information on energy consumption in an indoor cropping system, but I'd bet lighting energy consumption would eat up the additional revenue from higher yields.

Edit: Please let me know if anyone has access to scientific literature/experience on indoor farming energy use, I'm genuinely interested to know