This is the same sort of thoughts I had awhile back when I started building my small farm. The only real difference is that the garage I have is on a separate meter and billed separately and its only a 100a service (I think, not totally sure how to tell without calling an electrician to look at it). I currently am using about 25a @ 240v which gives me room to expand over time.
Usually there is a main breaker in the panel (fed from the meter) to cutoff all the other circuits, the rating of this breaker determines the size of the service. But yeah, 100A sounds about right for a dedicated garage or shed service. I might look into that option myself as I would rather not have to push my house circuits right to the limit all the time.
I've seen a lot of garages and large "sheds" with dedicated 50 amp service, but 100 amp is probably more common.
It's a LOT more common for a shed or seperate garage to be on a subpanel from the main house.
I wish I had enough power and cash to invest into 600+ GPUs, I'd be making some SERIOUS money at my cost of electric.
Resteraunts DO tend to have fairly high power service for their size, especially in areas like I'm in where it's all-electric and natural gas service might not even exist.
Those multiple bit ranges. ovens, commercial-size griddles, and walk-in reefers soak a lot of power, even the typical lighting in a place like that tends to be a lot of power.
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