Maybe. Some of the "continental" grid is in Africa, the above second map doesn't color in Russian bits of Europe, and then there are the other European grids. But the high bit is that there are significant parts on not this grid, there are 6-ish grids.
All of Europe's national grids are interconnected, and most of them import or export more than 10% of their power budget (some both, depending on the time of day). A large power fluctuation/blackout in one country can easily spread to neighbouring countries, the junctions can't absorb the sudden shift in network load.