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The world’s power grids, 50 million miles’ worth, need a major overhaul
(www.theverge.com)
This is a most excellent place for technology news and articles.
I don't think the solution to that problem though is having multiple, smaller, unconnected grids.
I think it's to just have a more resilient grid system that doesn't have any areas that are a single point of a failure
Many smaller, unconnected grids would also allow more resilience against something like solar flares as there aren't nearly as long of wires to build up a charge over and fry things.