They are all connected together so are either synced, or there is a big bang!
There may be some phase shift around the country, but they are all locked to the same frequency, unless there is some break in the national grid.
Larger systems can become unstable when operated as a single grid, continental Europe (and probably the US) is too large and is not a single locked grid.
Actually most of Europe is one grid
and 'one grid' is misleading.
You cant actually have a large area GRID, you can have a large area interconnected and broadly synchronous zone though.
What is not permissible is a 'ring' as the propagation delays from one part to another would result in large circulating currents wasting power.
I would say that;
Austria, Belgium, Bosnia-Herzegovina, Bulgaria, Czech Republic, Croatia, Denmark (West), France, FYROM, Germany, Greece, Hungary, Italy, Luxemburg, Montenegro, Nederland, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain and Switzerland
Could be seen as _most_ of Europe....
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