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Could leaving the EU leave us with a chronic shortage.
If they don't sell it to us they'd have a surplus of electricity or they'd need to turn off/down some of their other plants which makes it cost more for them. It's in their best interests to generate electricity for us.
Wikipedia says we get about 5% of our energy from France: https://en.wikipedia.org/wiki/HVDC_Cross-Channel
We've also got cables connecting us to Netherlands, Northern Ireland and Rep of Ireland. There are also cables under construction for connections to Norway and Iceland (both homes to huge amounts of cheap clean hydroelectric and geothermal power).
..this led to another question about future UK energy reserves.
We depend heavily on EDF supplying electricity to the South East of England via nuclear power stations in northern France. Could leaving the EU leave us with a chronic shortage.