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It would be essentially the same thing as a grid black start, except that the first breaker to close has the European grid on its primary side, instead of a freshly started generator under your control.

The complex process of configuring the transmission network to bring grid power to each power plant in succession is the same.

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The continental part of the EU runs on one synchronized grid. The Nordics (except half of Denmark and, uh, Iceland, Greenland etc) runs on a separate synchronized grid.

https://en.wikipedia.org/wiki/Continental_Europe_Synchronous...

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Re: probably also Morocco: yes, there is an interconnect across the Strait of Gibraltar

https://en.wikipedia.org/wiki/Spain-Morocco_interconnection

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Speaking of Gibraltar, it's interesting that its electricity grid isn't connected to Spain/EU's grid. So they are completely unaffected.
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