In 2025 Great Britain imported 21.9 terawatt-hours of electricity from France. That is 9.3% of everything the transmission system supplied, arriving down three cables with a combined capacity of 4 GW. So far in 2026 the share is 10.3%, and power has flowed from France to Britain in 96% of all half-hours.
Some ways to feel the size of that. It is 61% of what the entire British nuclear fleet generated last year. It is more than every solar panel in the country produced — 19.8 TWh of GB solar against 21.9 TWh of French imports. And it is 84% of the output Hinkley Point C is designed to deliver — a station costing something like £35bn in 2015 prices to build, and not expected before 2030.
This is not a trading relationship any more. It is a supply.



