UK’s ‘Black Sky’ Blackout Plan: How the BBC Would Keep Broadcasting If the Lights Go Out
If the lights went out across the whole of Britain — no electricity, no internet, no mobile phones, no running water — how would people find out what was happening? The BBC has now revealed its answer: a secret emergency radio studio, run by around 100 staff, with its own fuel, food and water, ready to broadcast for at least three days.
The plan was described in detail on 7 November 2026 by David Sillito, the BBC’s media and arts correspondent. It is the first time the broadcaster has explained in public how it would keep the country informed in a nationwide blackout.
The disclosure comes just weeks after the government launched its “Be Ready” campaign, urging every household in Britain to keep three days of emergency supplies at home.
What is a Black Sky event?
A “Black Sky” event is a power cut so big and so long that it drags almost everything else down with it.
It is not the short power cut most people know. In a Black Sky event, the grid fails over a wide area for days. Without power, water pumps stop, taps run dry, petrol stations cannot pump fuel, shops cannot open their tills, cash machines stop working, traffic lights fail, and mobile networks and the internet go down.
At a recent summit on UK resilience, the discussion focused on one clear target: the country should be able to withstand a Black Sky event for at least 72 hours — three full days.
There is a phrase often heard in the world of civil contingency planning: “We are nine meals from anarchy.” It is a blunt reminder that if people cannot eat for three days, a difficult situation can turn into chaos. That is why the government wants households to have their own supplies ready.
The government is careful to say there is no specific threat to the electricity grid, and that Britain has never had a complete nationwide blackout in the 75-year history of the national grid. The UK’s National Risk Register for 2026 says the same thing in plain terms: “Great Britain has never experienced a nationwide loss of power and the likelihood is low,” and the country has “one of the most reliable energy systems in the world.”
The BBC’s secret emergency studio
At the heart of the BBC’s plan is a special emergency radio studio. According to the BBC’s own reporting, about 100 BBC staff would run it. Only a small number of people inside the BBC know the full details, so the figures should be read as estimates rather than exact numbers. But the outline is clear.
The studio would have secure lines of communication that do not depend on the internet. It would hold enough fuel, water and food to keep running for at least three days without any supplies coming in from outside. Its job would be to broadcast pre-written government messages to the public — including practical instructions such as how much water people should drink each day, and how to deal with toilet waste when the toilets cannot be flushed.
Those messages are not being written in a panic. The scripts were prepared by the four Chief Medical Officers of the UK’s nations, with support from the health security agency, and were published by the government on 16 December 2025.
The broadcasts themselves would go out on FM radio, sent from radio transmission towers that are deliberately isolated from the internet. The towers have diesel tanks holding between 5,000 and 40,000 litres of fuel, enough to keep their generators running for three days. FM radio uses a lot of power, but it was chosen for a simple reason: it works almost everywhere, even during a blackout or a crippling cyber-attack.
The plan was originally drawn up for five to seven days. But the latest advice from Neso, the National Energy System Operator, is that power would probably be back in two to three days — and experts believe three days would probably be enough to get things working again.
The night Lancaster went dark
To understand why the BBC is planning this way, it helps to look at what happened in one English city ten years ago.
It was a Saturday night in early December 2015. Professor Roger Kemp, an engineering professor at Lancaster University who specialises in safety and electrical systems, was at home watching television. “I was halfway through a Scandi crime drama when everything went off,” he told the BBC. “Streetlights were off. The sodium glow that we can see over the horizon from Morecambe was off.”
At 22:45 on 5 December 2015, the River Lune, which flows through Lancaster, had flooded. The electricity supply to 61,500 people in the city went down. Households lost light and heat. Some water supplies began to fail because they relied on electric pumps. The railway station closed. So did petrol stations and shops. Most cash machines did not work. Traffic lights failed.
The next day, Kemp went for a walk. “[It was] almost like a zombie movie,” he said. “People trying to find phone reception, wondering where things were, and there was a huge queue at the one working telephone box.”
Only two communication systems survived that night: copper-wire landline telephones and FM radio. The local station, The Bay, kept broadcasting on an emergency generator.
Three months later, Kemp brought people together to study everything that had gone wrong. Their report reached a striking conclusion: “It is perhaps ironic that, in a society with huge commitment to digital infrastructure, the most reliable source of news was a commercial station using technology that would have been familiar to the engineers on the 1960s Radio Caroline pirate radio ship.”
For Kemp and others who work on civil contingency planning, Lancaster was a warning. “When a town loses power for several days, our connected world falls apart,” the BBC’s report says.
Why the government wants households to be ready
The BBC’s plan is only one half of the story. The other half is what the government is asking ordinary people to do.
On 22 October 2026, the Cabinet Office launched the “Be Ready” campaign, which replaced the government’s earlier “Prepare” guidance. It asks every household to keep enough supplies to get through three days without essential services.
The official checklist is simple: about three litres of drinking water per person per day, food that does not need cooking, some cash, a torch, a wind-up or battery-powered FM radio, medication and batteries.
Prime Minister Andy Burnham has urged people to take the advice seriously. Unexpected events “seem to becoming more common”, he said, and people should keep “those supplies in the house to get you through those moments.”
Defence Secretary Wes Streeting has gone further, warning that “we do live in a more dangerous and turbulent world” and that adversaries could be ready to attack by 2030.
The public appears to be listening. The Independent reported that the average cash machine withdrawal hit a record £106.20 on the Friday after the campaign launched, as households acted on the advice to keep cash at home. The campaign’s message is not that a blackout is about to happen. It is that a short period of self-reliance — three days of water, food and cash — would make a bad situation far easier to manage, whatever the cause.
Why this is happening now
Britain’s preparations are not new, but they have become more urgent in the last two years.
In April 2025, a mass blackout hit Spain, Portugal and south-western France, leaving millions without power and pushing the risk of a long power cut back to the top of the agenda in London.
There are also growing concerns about cyber-attacks and sabotage against European infrastructure. Governments across Europe now regularly advise households to stock up on supplies in case of a national emergency, and the BBC’s report notes that the UK has been behind other European countries in warning its population — but that work has now begun.
Britain already has a national blackout plan, called Programme Yarrow, which was launched in 2021 and covers outages of up to a week. It was put to the test in 2022. In May 2024, Oliver Dowden, the then deputy prime minister, launched the last Conservative government’s disaster planning initiative.
The government is also spending £70 million on High Altitude Pseudo-Satellites (HAPS) — aircraft that can circle over the UK and provide at least a week of emergency mobile and internet connectivity if ground networks fail.
The technology problem
One of the most uncomfortable parts of the BBC’s report is that some of the old systems that saved Lancaster in 2015 are being switched off.
The UK’s copper-wire landline system — the same system that kept working in Lancaster when everything else failed — will be switched off on 31 January 2027. Landline numbers will continue, but phones will have to be plugged into a broadband router, and a router needs mains power. In a long power cut, a digital landline only keeps working if it has a battery back-up.
The future of FM radio is also under government review, even though FM is the technology the BBC’s entire emergency plan depends on.
Professor Kemp thinks the country is moving in the wrong direction. Asked whether his report after Lancaster had helped improve Britain’s readiness for a Black Sky event, he paused. “If anything, we’ve gone backwards,” he said. “Switching off the public switch telephone network, I think shows that there has been really no thought at all about how you communicate when you’ve no longer got power.”
Lord Harris, the chair of the UK’s National Preparedness Commission, makes a similar point about how much has been lost in the drive for efficiency. “In the drive towards efficiency over the last five decades, we’ve lost backup systems,” he said. He gave the example of the new communication system being adopted by the emergency services, which will replace radio communications with mobile phone network technology — “so if the mobile phone goes down it will also impact on emergency services communications.” The government insists that moving emergency services onto modern 4G and 5G technologies is “resilient and reliable”.
Lord Harris also explained why a power cut is about more than the lights going out. “It’s likely to stop the water supply because unless you happen to be located neatly downstream of a reservoir, that requires electricity,” he said. “More importantly, sewage tends to solidify unless water can move through it, and that then causes blockages, the whole thing backs up, you get sewage flowing out, flowing back up the system.”
How likely is a nationwide blackout?
Nobody can give a precise figure — but the official assessment is reassuring.
The National Risk Register for 2026, the government’s own assessment, lists a complete failure of the national electricity transmission system as a low-likelihood, reasonable-worst-case scenario. It states plainly that a nationwide loss of power has never happened in Britain.
What the register does expect is regional power cuts, usually caused by severe weather. The most recent example was Storm Darragh in the winter of 2024–25, which left more than two million homes without power, with disruption lasting up to a week for hundreds of customers.
If the national grid did fail, the register expects about 60 percent of electricity demand back within two days, all customers reconnected by days five and six, and full, stable power beyond seven days.
In other words, the realistic risk for most people is a local power cut lasting hours or a couple of days — exactly what the Be Ready advice is designed for. A Black Sky event is the extreme case, and the planning for it is insurance, not a prediction.
What this means beyond Britain
Britain is not the only country thinking this way. Governments across Europe regularly advise households to keep emergency supplies, and the April 2025 blackout in Spain and Portugal showed that even modern grids in wealthy countries can fail on a large scale.
The lesson of Lancaster applies anywhere, including Pakistan: when everything digital fails, the oldest technologies are often the ones that still work. A battery-powered radio, a torch, some cash and a few litres of water cost very little, but in a long power cut they can make the difference between coping and crisis.
Frequently asked questions
What is a Black Sky event?
A Black Sky event is a power outage so widespread and so long that it also takes out water supplies, shops, cash machines and communications. At a recent UK resilience summit, the focus was on being able to withstand such an event for at least 72 hours.
What is the BBC’s Black Sky plan?
About 100 BBC staff would run a special emergency radio studio with secure communication lines that do not use the internet, and enough fuel, water and food to operate for at least three days without resupply. It would broadcast pre-written government instructions on FM radio, using transmission towers with diesel generators.
What is the government asking households to do?
The “Be Ready” campaign, launched on 22 October 2026, asks every household to keep three days of supplies: about three litres of drinking water per person per day, food that does not need cooking, cash, a torch, a wind-up or battery-powered FM radio, medication and batteries.
Has Britain ever had a nationwide blackout?
No. The government says there has never been a complete nationwide outage in the 75-year history of the national grid, and there is no specific threat to it. The National Risk Register for 2026 describes a nationwide loss of power as low-likelihood.
What happened in Lancaster in 2015?
On 5 December 2015, the River Lune flooded and cut electricity to 61,500 people in Lancaster. Homes lost light and heat, water supplies began to fail, shops and petrol stations closed, and most cash machines stopped working. FM radio and copper landlines were the only communication systems that survived.
What are High Altitude Pseudo-Satellites?
They are aircraft being developed with £70 million of government funding. They can circle over the UK and provide at least a week of emergency mobile phone and internet connectivity when ground networks fail.
Conclusion
The BBC’s Black Sky plan is not a warning that Britain is about to go dark. It is the opposite: a detailed, practical plan for making sure that if the worst ever happened, the country would still be able to hear what to do.
The plan’s most important message is also its simplest: when everything else fails, the things that keep working are the simplest ones — a radio, a torch, a landline, a few litres of water. The BBC has built its emergency plan around that fact, and the government is now asking every household to do the same.
Sources
- BBC News, David Sillito, “What happens if all the lights go out? This is the plan for a ‘Black Sky’ event”, 7 November 2026 (full text republished via Economia Post): https://today.echonomiapost.com/2026/11/07/what-happens-if-the-internet-goes-down-blacksky-the-uks-emergency-backup-plans/
- Prepared Britain, “What happens in a national power outage — and how to prepare”, updated 3 November 2026: https://www.preparedbritain.co.uk/guides/national-power-outage
- NJ Radar Online, “Governments Around the World Are Preparing for Major Emergencies. What Do They Know?”, 7 November 2026: https://njradaronline.com/governments-around-the-world-are-preparing-for-major-emergencies-what-do-they-know/
- Pasquale Pillitteri, “BBC Reveals Its Black Sky Emergency Radio Plan for a Nationwide UK Blackout”, 7 November 2026: https://pasqualepillitteri.it/en/news/30947/bbc-black-sky-emergency-radio-studio-uk-blackout-plan
This article is for general information and education only. It is not legal or financial advice.
