For retrofitting, you wouldn't want to put an engine of much greater power in there, it would destroy the other parts. It would be like putting an 800 hp engine in a car designed for an 180hp one.
As far as i know, they use diesel generators to provide the power usually.
Using HTS in the generator would/could provide a drastic improvement in the effciency, and would be a much more exciting development in my opinion.
you should try to build / get someone to build you a version without Tools - Extensions menu item.
http://www.amsuper.com/products/htsWire/ Here is a link that has some good specs on the wire they use.
For retrofitting, you wouldn't want to put an engine of much greater power in there, it would destroy the other parts. It would be like putting an 800 hp engine in a car designed for an 180hp one.
As far as i know, they use diesel generators to provide the power usually. Using HTS in the generator would/could provide a drastic improvement in the effciency, and would be a much more exciting development in my opinion.