[Here is the rest . . . I wonder if this will post.] Standards are narrowed down to one or two for many reasons, primarily because the design engineers, tech support people, service people and others can only master one or two techniques, and there is a limited amount of R&D money. Once a good method -- or a good-enough method -- emerges, others tend to fall by the wayside.
This is why cold fusion electricity is likely to be used by one method, and only one method, after the technology matures. It is not because cold fusion itself is limited to one method. It is because manufacturers, people, and society as a whole are not inclined to test many different implementations after a reasonably good one is found. We find something that works and we stick to it. This is why many sub-optimal technologies continue in use for a long time, even after better ones have been invented. This is also a matter of economics. All else being equal, the lowest-price method prevails in the end. Individual generators will be cheaper than a combination of grid plus generators and for that reason alone, grid distribution cannot compete and will not survive. END
