How a 0.2Hz Wave Took Down Two Countries’ Power Grids

Description

🔌 How did a slow 0.2Hz wave trigger one of Europe’s biggest blackouts? On April 28, 2025, the Iberian power grid—spanning Spain and Portugal—collapsed in under 90 seconds. In this video, I explain exactly what went wrong, why it wasn’t a “renewables problem,” and how it could happen again.

As a grid engineer, I break down:

- The five cascading phases of the blackout
- Why low demand and excess reactive power primed the system for failure
- What inter-area oscillations are (and why they’re so dangerous)
- How protection relays and poor ride-through settings accelerated collapse
- What went wrong with voltage control and shared infrastructure
- The roles of France, Morocco, and Portugal in restarting the grid
- What this means for the future of high-renewables grids like the UK

Spoiler: Renewables weren't the root cause, but poor integration and weak grid planning were.

📈 Whether you're an energy nerd, an engineer, or just curious how a wave can take down two countries' power, this video dives deep with expert insight and real data from official blackout reports by ENTSO-E, REE, and AELEC.

🔧 Chapters:
0:00 Intro
1:12 Phase Zero, Why
5:35 Phase 1, Inter-Area Oscillations
10:30 Overvoltage Protection and Ride Through
12:00 SCADA
12:40 RoCoF & Callide C4
13:26 Phase 3, Cascading Collapse
15: 20 Transformer Taps
16:40 Root Causes
18:35 New Report Issued
19:20 Energy Storage
19:30 Phase 4, System Black
21:48 Lessons and Fixes
23:55 Can this happen to the UK
26:35 Outro
27:05 Out-Takes

Corrections:
1:49 Heaters are a resistive load, not reactive generally.
15:35 I wrongly point at the LV side. Tap changers are typically on the HV side (taller side) however either side can be the primary or secondary depending on context. In a step up transformer the LV side would be primary.

🔗 Sources
📄 ENTSO-E Investigation: [https://www.entsoe.eu/publications/blackout/28-april-2025-iberian-blackout/]
📄 REE Report: [https://wattclarity.com.au/articles/2025/06/18june-ree-report-spanishblackout/]
📄 Spanish Gov Report: [https://www.lamoncloa.gob.es/consejodeministros/resumenes/Documents/2025/Informe-no-confidencial-Comite-de-analisis-28A.pdf]
📄 AELEC Full Report: [https://aelec.es/wp-content/uploads/2025/07/20250730_CL_INESCTEC_Blackout_full-report_en.pdf?]
📄 UK 2019 Blackout Reference: [https://youtu.be/22T9-oknmLM?si=sz1XR8b_pL_5UfSo]

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#IberianBlackout #GridCollapse #PowerSystems #EngineeringExplained #Renewables #SpainBlackout #ENTSOE #EnergyTransition