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Substations would still be necessary. Substations are responsible, among other things, for controlling voltage level.

Integrating power grids usually involves more substations, not fewer.

Wouldn't having more substations make the grid more resilient? I would imagine that allows for more flexibility routing power.

It really seems like it would depend on the topology and capacity of the various routes. Just having more of them isn't necessarily the same as having more flexibility in routing.

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