They mention a bunch of new designs: hollow cores, high-temperature insulation, adjustable impedance. It's sort of hard to replace a grid-frequency transformer

They mention a bunch of new designs: hollow cores, high-temperature insulation, adjustable impedance. It's sort of hard to replace a grid-frequency transformer (mammoth-sized because of the low frequency) with something like a switched power supply that uses much higher frequencies and thus much smaller coils. The semiconductors required for that barely handle a couple of kV, while the grid uses tens and hundreds of kV. But a crisis like this is a good thing for the progress of technology. Demand by far outstrips supply, there's obviously good money to be made. Many new approaches are going to be researched and tried.