The Black Sky Plan: How the UK Prepares for a Total Blackout

Imagine a world where the lights go out, not for minutes or hours, but for days. No electricity, no water, no internet, no phone service. This is the scenario known as a 'Black Sky' event, and it's one that governments and emergency planners are increasingly taking seriously.

A Warning from Lancaster

In December 2015, the city of Lancaster experienced a taste of what a Black Sky event might look like. Heavy rainfall caused the River Lune to flood, knocking out power to 61,500 people. For nearly a day, residents were plunged into darkness. Streetlights failed, cash machines went dead, and traffic lights stopped working. Water supplies began to fail because pumps relied on electricity. Shops and petrol stations closed. The railway station shut down.

Professor Roger Kemp, an engineering expert at Lancaster University, witnessed the chaos firsthand. He described the scene as 'almost like a zombie movie,' with people wandering the streets trying to find phone reception and queuing at the one working telephone box.

What surprised Kemp was that the most reliable communication systems were the old ones: copper wire landlines and FM radio. A local commercial station, The Bay, managed to stay on air using an emergency generator, providing crucial information to residents.

Three months later, Kemp convened a meeting to analyze the response and learn from the failures. The subsequent report concluded that in a society heavily dependent on digital infrastructure, the most reliable news source was a commercial station using technology familiar to 1960s pirate radio engineers.

The 72-Hour Threshold

For civil contingency experts, Lancaster was a wake-up call. A Black Sky event is defined as a prolonged disruption of essential services, and the consensus is that the UK must be able to withstand such an event for at least 72 hours. The phrase 'nine meals from anarchy' is often cited, highlighting the fear that three days without food could turn a crisis into chaos.

The government's 'Be Ready' campaign aims to prepare citizens for various emergencies, including Black Sky events. While there is no specific threat to the grid, the campaign encourages households to stockpile supplies. In a major emergency, the advice is to stay put and tune into FM radio, just as Lancaster residents did.

The BBC's Black Sky Plan

The BBC has its own plan for such a scenario. About 100 staff members are trained to run a special emergency radio studio, equipped with secure communication lines independent of the internet, and enough fuel, water, and food to operate for at least three days. The service would broadcast pre-arranged government messages, including instructions on rationing water and disposing of waste without flushing toilets.

Broadcasts would be transmitted via radio towers isolated from the internet, powered by generators with diesel reserves of up to 40,000 litres. Satellite phones would keep teams in contact, with pre-agreed protocols if they fail. FM radio is chosen because it works almost everywhere, even in a blackout or cyber-attack.

One BBC insider revealed that initial plans assumed a five-to-seven-day outage, but recent advice from the National Energy System Operator suggests power could be restored within two to three days.

The Fragility of Our Connected World

Lord Harris, chair of the UK's National Preparedness Commission, warns that power cuts are about more than just 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. Sewage systems also depend on electricity to pump water; without it, waste solidifies and causes blockages, leading to sewage backing up into homes.

While European governments regularly advise households to stock up on supplies, the UK has lagged behind. However, efforts are underway to develop backup systems, such as High Altitude Pseudo-Satellites (HAPS). The government is investing £70 million in developing planes that can circle over the UK and provide at least a week of emergency mobile and internet connectivity during crises.

Experts believe that three days would likely be enough to restore services if a Black Sky event occurred in the UK. But as our world becomes more connected, the potential for catastrophic failure grows. Lord Harris points out that in the drive for efficiency over the past five decades, we've lost backup systems. For example, the new communication system for emergency services relies on mobile phone networks, which could be knocked out in a blackout.

Are We Ready?

The government insists that moving emergency services to 4G and 5G technologies is resilient and reliable. But concerns remain. The UK's copper wire landline system, which works even in a power cut, is set to be switched off on 31 January 2027. The future of FM radio is also under review.

When asked if his report had improved readiness for a Black Sky event, Professor Kemp 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.'

As if to underline the point, while writing this article, the author experienced a power cut. The emergency torch had leaked batteries, candles were buried in a cupboard, and the wind-up radio was nowhere to be found. It's a reminder that when the lights go out, even the best-laid plans can be tested.