transformers are infrastructure, 100% duty cycle with a significant overload capacity that can be 3 times name plate, right there with dams and bridges, and if one developes a fault, realy bad things happen and you get a crater. There very nature makes them imensely heavy and very compact, all of the equipment used to form the parts is gargantuan, and materials to build them come in units that must be moved by house sized forklifts, consider changing a tire on such a forklift. Remember that the largest transformers travel on the heaviest rail cars, specials, these things are way heavier than anything else per ft³. Which gets us to cold,warm, or hot idle, or decomisioning, which are your choices when a huge factory has no work, hot idle means limited production, warm means some of the guys hang out and tinker with stuff, cold means, locked up,no employees but security, as decomisioning something like this has strategic considerations, or should.