Repsol warned of blackout that halted Cartagena refinery

The blackout Repsol predicted: 15 GW lost in 5 seconds

Days ago, the Cartagena refinery lost power. What seemed an isolated incident revealed a deeper story: Repsol had warned five days earlier of a potential major failure. The outage left part of Spain without light, with data showing 15 GW vanished in just 5 seconds, nearly 60% of national consumption. The question is who flipped the switch.

The sequence of collapse

Analyses indicate the incident occurred at 12:33, during peak solar and wind production. Clear skies across the territory and wind in most parks. The grid, with record renewable peine, couldn't handle the overload, causing drops in power and frequency. Within seconds, 15 GW disappeared from the system. Instability cascaded, leaving the Repsol refinery in darkness. This is not trivial: at that moment, 60% of national demand depended on intermittent sources.

Renewables vs nuclear: debate heats up

One school of thought argues the root cause is massive renewable deployment, producing variable electricity that destabilizes the grid. They claim nuclear plants, with constant generation, are the only reliable buffer against such peaks. Opponents blame underinvestment in the grid and government planning stalled for 21 months. Red Eléctrica (Spain's grid operator) reportedly acknowledged to investors two months ago the risk of "disconnections" due to high renewable peine. Moreover, the task force preventing blackouts hasn't been convened for 20 months. The sense is the system was neglected until it blew up.

Nuclear burden and energy policy

Another emerging fact is tax pressure on nuclear power. Detailed breakdowns show nuclear plants bear €27.46 per MWh produced in taxes: Enresa fee, production tax, spent fuel tax, social bonus contribution, regional eco-taxes, and municipal fees. These costs make operation unviable without losses. This context fuels the thesis that the Government is strangling nuclear to force closure, fulfilling its electoral agenda at the expense of system stability. Ironically, while firm generation plants close, dependence on intermittent sources grows.

The CNI factor: a curious note

Among circulating data, one stands out: CNI (Spain's National Intelligence Center) detected "significant unusual activity" from North Africa days before the blackout. Cyberattack? Coincidence? Some analysts link it to possible external sabotage, though no official confirmation exists. What is clear is the incident has again highlighted the vulnerability of Spain's electric system.

Open conclusions

The Cartagena blackout isn't isolated. Until the contradiction between renewable ambition and lack of investment in grids and storage is resolved, new collapses remain possible. The question isn't if more blackouts will happen, but when. And who will take responsibility when the bill arrives.