# Preparing for a Black Sky Event: The UK's Emergency Resilience Strategy Governments and broadcasters are developing contingency plans for potential multi-day national power grid failures. - **Source:** [BBC News – Top Stories](https://www.bbc.co.uk/news) - **Published:** 2026-11-07 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/098c82b7-7a1f-4f59-92af-8d9b56226e5b ## Defining Black Sky Events A Black Sky event refers to a catastrophic, long-term disruption of the electrical grid that paralyzes essential services. Experts warn that modern society's extreme reliance on digital infrastructure makes it uniquely vulnerable. When power fails, interconnected systems like water pumps, traffic lights, and financial services collapse, creating a state of emergency. ## Lessons from Lancaster Floods In December 2015, a flood in Lancaster cut power to 61,500 people for several days, exposing critical infrastructure gaps. The city lost heat, water, and mobile connectivity, leaving residents isolated. The only surviving communication channels were copper landlines and FM radio, proving that legacy technology remains vital during modern grid failures. ## The Three-Day Resilience Goal Civil contingency experts emphasize the need for the UK to withstand a total blackout for at least 72 hours. This timeframe is considered critical, as authorities suggest that three days without food or water could lead to social chaos. The government is now urging citizens to maintain personal emergency supply stockpiles. ## BBC Emergency Broadcasting Plan The BBC maintains a specialized emergency radio studio designed to operate independently of the internet. Staffed by approximately 100 people, the facility is equipped with fuel, water, and food to last three days. It will broadcast pre-arranged government instructions, including guidance on water consumption and waste disposal, via isolated radio towers. ## Technical Infrastructure Challenges FM radio remains the primary emergency broadcast medium because it functions without internet connectivity. Transmission towers are being outfitted with large diesel tanks, holding up to 40,000 litres, to power generators for three days. Despite this, the government is reviewing the future of FM radio and phasing out copper landlines by 2027. ## Water and Sewage Risks Lord Harris, chair of the National Preparedness Commission, warns that power cuts threaten more than just lighting. Water supplies rely on electric pumps, and sewage systems require constant flow to prevent solidification. Without electricity, blockages can occur, potentially causing sewage to back up into homes and creating severe public health hazards. ## Developing High-Altitude Solutions The government is investing £70 million in High Altitude Pseudo-Satellites, or HAPS, to provide emergency connectivity. These aircraft are designed to circle the UK, offering mobile and internet access when ground networks fail. However, experts note that satellite-based fallbacks have inherent limitations compared to traditional, ground-based radio transmission systems during crises. ## Concerns Over Declining Preparedness Critics argue that the drive for efficiency has stripped away vital backup systems, leaving the nation more vulnerable than in previous decades. As the UK transitions emergency services to 4G and 5G networks, concerns persist regarding the reliability of these systems during a total grid collapse. Resilience remains a significant national priority. ## Sources covering this story - https://www.bbc.co.uk/news/articles/ck5ynnj05z8no?at_medium=RSS&at_campaign=rss — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._