However, we’ll still need convention land farming for staple crops like corn, wheat, oats, rice, sorghum, and millet.
Yes, but those are not “fresh” foods. They can be grown seasonally and stored for use throughout the year. That’s why the worries about how much electric power it would take to make all farming indoors is moot. Growing only greens aeroponically, the electric cost is partially offset by lower costs for fertilizer and pesticides, and the add to the electric demand manageable.