From what I understand, current reactors use regular steam to run turbines to make electricity. Superheated steam isn't really necessary but reactors could be made that use that. A side benefit of the superheated steam is that it can be used for thermal cracking of water to make Hydrogen and Oxygen on a bigger scale. Right now there is really no use for large quantities of Hydrogen so they just make it the old fashioned way.
The big picture would be electricity from hydro, wind, solar, and nuclear, with a mobile fuel source hydrogen for a 100% greenhouse gas free energy world.
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