100Amp enough for a 750sqf 2/1 unit?

[Andrew S.]

I' m planning on renovating a 2x 2/1 duplex (ca 1500 sqf total). Current electricity supply is 100Amps for each unit. My GC claims this is plenty of power since hot water and furnace both run on natural gas. I was considering upping the power supply to 150 or 200Amp for each unit on the assumption that demand for electricity will only increase over time.

Who is right? Should I leave "good enough" alone or is it worth paying now to avoid potential shortfalls in the future?