Go look up the DoE's reports on our large power transformers (LPTs). A ton came online in the 70s when the grid got its last great investment(?) and we don't have replacements on hand. They take years to build and each is custom for the specifics of their load and the distance they're transmitting power, IIRC.

We can only build the smaller ones, the others all are made by Siemens in Germany. And they cost a few million each.

Some are starting to blow. Nobody's being proactive about it.