The Iberian blackout: what happens when everything goes dark?
For several hours, tens of millions of people lost power, card payments and mobile data. It was a vivid reminder that digital businesses still run on very physical infrastructure.
By the Xuru Technologies team · 30 April 2025
Key takeaways
- On 28 April 2025 a massive blackout hit mainland Spain and Portugal, halting trains, traffic lights, card payments and many communications.
- Power was largely restored within a day, but businesses lost trading hours and stock.
- Cash, offline procedures and cloud-hosted systems helped some businesses keep going.
- Every business should have a short continuity plan for power, internet and payment outages.
Most continuity plans focus on cyber attacks. This week showed that a simple loss of power can stop a business just as completely.
What happened
Euronews reported on the economic impact as the outage shut down transport and businesses across both countries. Payment Expert noted that card terminals stopped working and cash became essential for many purchases.
What it means for businesses
- Payments can stop. Shops and restaurants without a cash fallback simply couldn't trade.
- Cloud hosting helps. Websites and systems hosted in data centres elsewhere stayed online, even when local offices went dark.
- Communication needs a plan B. If mobile networks fail, how do staff and customers hear from you?
- Bookings and orders need updating once systems return — a messy job without a process.
A one-page continuity plan
| Scenario | Plan |
|---|---|
| No power at your premises | Cash float, paper order pads, battery lights and a closing procedure |
| No internet | Mobile hotspot backup; offline-capable till where possible |
| Website or booking system down | Status message, phone and email fallback, list of today's bookings saved offline |
| Communicating | Pre-written messages for social media and your Google profile |
Frequently asked questions
Will my website stay online during a local power cut?
If it's hosted in a professional data centre, usually yes. Your ability to update it or answer enquiries depends on your own power and internet.
Should small businesses keep cash?
A modest cash float and the ability to accept cash during outages is a sensible fallback where local rules allow.
How often should we review a continuity plan?
Once a year, and after any incident. Keep it short enough that staff actually read it.
Always online, even when you're not.
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