--- title: "3 Questions: Shedding light on why power grids go dark" url: https://daily.dev/posts/3-questions-shedding-light-on-why-power-grids-go-dark-bzujwvddn source_url: https://news.mit.edu/2026/3-questions-why-power-grids-go-dark-0512 type: article source: "MIT News" published: 2026-05-12T21:35:41.099Z updated: 2026-05-12T21:35:59.444Z reading_time: 10 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # 3 Questions: Shedding light on why power grids go dark **[MIT News](https://daily.dev/sources/mit)** · 10 min read · 0 upvotes · 0 comments ## Summary A year after the April 28, 2025 Iberian blackout that left Spain and Portugal without power for up to 12 hours, MIT Energy Initiative researcher Pablo Duenas-Martinez explains the technical chain of events. The outage was triggered by a voltage death spiral: oscillations on the grid, combined with insufficient conventional generators providing reactive power control in southern Spain, caused a cascade of automatic shutdowns starting with small solar installations. Five key lessons emerged: regional (not just national) generator ratios matter for reactive power; large solar and wind plants above 5 MW must now provide reactive power control; better coordination between transmission and distribution system operators is needed; Spain's upper voltage limit is dangerously high and should be lowered; and automated shunt reactors plus additional STATCOM devices are being deployed to enable faster voltage response. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Europe's energy grid faces growing cyber threat](https://daily.dev/posts/europe-s-energy-grid-faces-growing-cyber-threat-e8y11ebxc) · The Register · 0 upvotes · 0 comments - [The end of load shedding hasn’t fixed South Africa’s power problem](https://daily.dev/posts/the-end-of-load-shedding-hasn-t-fixed-south-africa-s-power-problem-6qplqa8gt) · TechCentral · 0 upvotes · 0 comments - [One fallen power line exposed a growing AI data center problem. Here’s how to fix it.](https://daily.dev/posts/one-fallen-power-line-exposed-a-growing-ai-data-center-problem-here-s-how-to-fix-it--f8fvg87zu) · TechCrunch · 0 upvotes · 1 comments --- [View this post on daily.dev](https://daily.dev/posts/3-questions-shedding-light-on-why-power-grids-go-dark-bzujwvddn)