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It doesn't add up...'s avatar

The collapse didn't take minutes: it took just 5 seconds for 15GW of supply to be knocked out. The problem started with overvoltages and oscillating voltages in the South where solar dominates the generation. This led to a trip on a high voltage line feeding towards Madrid: the power tried to re-route, but overloaded another transmission line which tripped 1.3 seconds later. The resulting shortage of power in the rest of the country was severe, and with the lack of inertia as described by Michael Shellenberger the grid frequency fell extremely rapidly. We can infer from the fact that all the nuclear and most of the other inertia providing generation as well as lots of wind tripped out that the frequency dropped below 47.5Hz. That would also have triggered a 60% automated disconnection of demand, including the interconnections with Portugal, which was 40% reliant on Spanish power and so also suffered immediate collapse and France, which was a relatively small export of about 900MW, but enough to cause local blackouts over the border. The figures for generation less than 5 minutes before the collapse (which we are told started at 12:33:42.2) and at 12:35, barely a minute afterwards are in these charts:

https://i0.wp.com/wattsupwiththat.com/wp-content/uploads/2025/04/Spain-before-apagon-1745937743.5157.png

and

https://i0.wp.com/wattsupwiththat.com/wp-content/uploads/2025/04/Spain-apagon-after-1745936970.3339.png

10GW of solar was lost: domestic installations rely on the grid for a frequency reference and to be able to export surplus power, and shut down automatically when there is a power outage unless they have very sophisticated capabilities to switch to running off grid. Plenty of commercial solar was also affected.

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Trudie's avatar

Wow! Does anyone think the govt will listen to the experts?

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