Right, but it's the big semi-custom stuff that's hard to get. Distribution transformers (the things on poles) are a commodity. Part of the problem with generat

Right, but it's the big semi-custom stuff that's hard to get. Distribution transformers (the things on poles) are a commodity. Part of the problem with generator step-up transformers is that the input side generator specs are determined by the generator, and the output side transmission grid specs are determined by the grid operator. The transformer is the component stuck with the job of making those compatible. That's the kind of problem which leads to N x M variants being needed.