Unexplained Were renewables to blame?

Spain and Portugal suffered the worst blackout in living memory in Europe this week.

- Helena Horton

Some have blamed renewables and net zero emissions targets, as the two countries boast high levels of wind and solar on their electricity grid and lead Europe in the technologies. But is this true?

Some initial reports suggested a "rare atmospheric phenomenon" may have been to blame, citing a statement attributed to the Portuguese grid operator, REN. In extreme weather, such as during storms and heatwaves, the cables that carry electricity overhead can oscillate, which can cause problems with the conductors, particularly on older and poorly maintained equipment. However, the weather in Spain was normal on Monday. Yesterday, REN denied it had been responsible for the statement, but did not give further details.

The Portuguese government blamed an unexplained power transmission issue.

Spain pointed the finger at a breakup in its connection to France. Experts have said it could take days to identify the cause.

Spain and Portugal lead the EU in renewables and were sourcing about 80% of their electricity from solar and wind when the blackout hit on Monday.