This truly shows your ignorance. Please show curiosity rather than redditesque comments like this.

First. The final report of the Iberian blackout is not completed yet. It is taking longer than expected due to how complex the situation was.

They did release an interim factual report in which they specify the facts. The full root cause analysis and recommendations on how to prevent similar events is coming in Q1 2026.

From the factual report we learn that:

1. The cause was a lack of voltage control. Do you see inertia here?

2. They did expect traditional power plants to provide this, without verifying.

3. They did not expect renewable power plants to provide this, therefore they did not.

In about all other grids like, like for example the US, renewable plants are expected to provide voltage control. It is trivially done by extremely cheap off-the-shelf components.

But if the expectation does not exist then it will not be provided since the cost is non-zero.

https://www.entsoe.eu/publications/blackout/28-april-2025-ib...