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Transmission lines do help stabilize the local grids. Case in point is the 2011 San Diego blackout. One 500kV transmission line tripped offline during maintenance and the local grid collapsed.

Same problem. None of that helps local grids since any point of failulre can affect you and your home as does marginal elements in the network. They are not very fault tolerant. Your logic and architecture is wrong.

But then your final statement supports my view and not yours. Faults tend to propagate.

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