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I think that anything in the 300v range is using IGBTs for high power applications. The fixed voltage drop just becomes less loss at that point. New IGBTs are way expensive! And you should only (according to Lee Hart) run an IGBT continuously (or was it for a very short time like 1 minute?) at about 1/3 of it's current rating. I think you would need like 4 600 amp devices to get the 1000 amp controller, and liquid cooling.
However, if it pans out, a company that spoke to Rod Hower I believe (the head designer at Ametek) told him about their company's breakthrough high voltage mosfets with low RdsOn (resistance from drain to source while gate is high) that would make IGBTs obsolete. They would be really expensive at first, though.
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