NHS resilience under heat, power cuts and cyberattacks: why households stockpiles and surge capacity matter

Overview

The Conversation examines how the NHS faces predictable emergencies such as heat waves, power outages, and cyberattacks, and why a government push for household stockpiling could free public services to help those most in need. It notes record A&E attendances and ongoing capacity strains, and argues resilience must extend from households to hospital wards and critical infrastructure. Original publisher: The Conversation.

Key insights

• Heat events drive hospital demand and raise the risk of corridor care, making household preparation a strategic public health measure.
• Power cuts threaten patients reliant on electricity for medical devices, and there is a lack of a coherent national plan for protecting vulnerable customers.
• Cyber threats to the NHS are rising, with ransomware campaigns causing postponed appointments and even contributing to patient harm.
• Surge capacity and resilience in hospitals are as essential as household readiness, requiring sustained investment and systemic safeguards.

Overview

The article discusses how the NHS is tested by three foreseeable emergency scenarios — heat waves, power outages, and cyber attacks — and examines a government publicity campaign urging households to stock basic supplies. The aim is to relieve pressure on public services so they can concentrate resources on those in greatest need. It also highlights the stress already plaguing the health system as it grapples with high bed occupancy, aging facilities, and a backlogged NHS.

Heat and its impact on health services

Heat has a direct and cascading effect on the health system. England and Wales recorded more than 2,700 excess heat related deaths in May and June during record heat waves in 2026, following 1,504 heat related deaths in England in summer 2025. The climate context includes a 37.3°C red heat warning in June and amber warnings for wildfires in August, signaling a broader risk environment. Projections suggest heat could cause up to 10,000 deaths per year by the 2050s if adaptation and resilience measures are not undertaken.

Within the NHS, heat translates into higher demand for acute care and more patients occupying beds that would normally be free for emergencies. In July 2026, England recorded about 2.5 million A&E attendances across two heat waves, with around 3,000 patients per day treated in corridors or other spaces not designed for care. NHS England has noted a 53% rise in overheating incidents in hospitals since 2016, and the estates maintenance backlog stands at approximately £15.9 billion. Bed occupancy in England has hovered above 90% since 2021, with 95% occupancy reported in January 2026, far above the safe benchmark of 85% commonly cited by health authorities. England has an average of 2.4 hospital beds per 1,000 people, versus 4.6 in 38 high-income countries, illustrating the system’s limited spare capacity to absorb shocks.

Policy responses include the 10-Year Plan for England, which promises to end corridor care by improving hospital capacity and resilience. However, critics argue that this plan does not fully address the systemic capacity needed to withstand a national emergency, beyond the step of asking households to prepare for extreme weather and other disruptions.

Power failures and health care

For most households, a power cut is an inconvenience, but for people who rely on electricity for medical support such as home oxygen, ventilators, or refrigerated medications, it can be life threatening. There is a National Grid Priority Services Register for customers who depend on electricity for medical reasons, but the article notes there is no national plan specifically ensuring the protection of this vulnerable group in a nationwide outage. Recent outages show how long disruptions can last: Storm Éowyn in January 2025 left 30% of premises in Northern Ireland without power, with thousands still without power a week later; a substation fire near Heathrow disrupted power to Hillingdon Hospital. An official review found network operators generally unaware of which customers are critical national infrastructure needs anchor resilience.

Cyber threats and health security

The NHS has faced significant cyber incidents historically, with WannaCry in 2017 affecting at least 81 of England’s 236 hospital trusts and causing about 19,000 canceled appointments at an estimated cost of £92 million. In June 2024 a ransomware attack on the pathology provider Synnovis forced the postponement of more than 10,000 appointments and 1,700 operations, triggering a national blood shortage alert because hospitals could not cross-match blood. It was later linked to a patient death. The government has since introduced a cybersecurity strategy for health and social care extending to 2030, and the National Cyber Security Centre reported 204 nationally significant attacks between January and August 2025, more than doubling the previous year. An Iran-linked attack in July 2026 shut down a small UK power generator for four days, underscoring the evolving threat landscape.

The article argues that although the NHS has a framework for emergency preparedness, resilience is not just about having a plan but about having the capacity to execute it with slack in the system. The COVID-19 inquiry concluded that the UK lacked resilience going into the pandemic; its 2026 healthcare report found the NHS coped, but only just, and recommended surge capacity be enabled in hospitals.

Policy implications and a way forward

The piece contends the government’s campaign encouraging households to stock a small reserve of tins and bottled water is a sensible first step and relatively inexpensive. Yet extending resilience requires ensuring hospitals have room to absorb a surge in demand, securing critical infrastructure alongside the power grid, and protecting people whose treatment depends on reliable electricity. The author argues extending the same urgency to the health system’s capacity and resilience is the natural next step and would help create a truly resilient public health framework capable of withstanding a national emergency.

Conclusion

The article closes by praising the new resilience campaign as a sign that resilience is a priority, while urging that resilience be extended to health facilities and energy infrastructure to ensure the NHS can weather a national emergency without overburdening households or compromising patient care.