The rolling blackouts that have crippled Cuba’s power grid for the past week have prompted a stark warning from British energy researchers: the risks of cascading grid failure extend far beyond the Caribbean. A paper published by the University of Oxford’s Institute for Energy Studies, released this morning, argues that densely populated, high-rise nations – particularly those reliant on centralised power distribution – are more susceptible to systemic collapse than previously modelled.
The Cuban crisis, which began on 18 October when the Antonio Guiteras power plant near Matanzas tripped offline, has left the island’s 11 million residents without electricity for up to 18 hours a day. The grid’s fragility, exacerbated by ageing infrastructure and fuel shortages, has forced the government to impose rolling cuts that now threaten water pumps, hospitals, and food storage. But the Oxford team, led by Professor Eleanor Thorne, contends that the structural conditions which turned a single plant failure into a nationwide blackout are replicated in many modern urban centres.
“High-rise buildings are energy-intensive vertical communities,” Thorne said. “They depend on lifts, water pumps, and ventilation systems that require continuous power. When the grid fails, these buildings become uninhabitable within hours. The social and economic costs are disproportionate to the initial fault.”
The paper models a hypothetical blackout in a city of 10 million, with a building stock similar to London or Dubai. It finds that a two-day outage could displace 40 per cent of residents, cause billions in lost economic output, and overwhelm emergency services. The authors call for a reassessment of national resilience strategies, urging governments to invest in microgrids, decentralised renewables, and building-level backup systems.
The warning comes as the International Energy Agency prepares to release its annual World Energy Outlook, which is expected to highlight the growing strain on power grids from climate extremes and surging demand. Cuba’s plight is a case study in how political isolation and economic sanctions compound technical failures. The US embargo has long restricted Cuba’s access to spare parts and financing for grid upgrades, forcing engineers to rely on makeshift repairs.
But the blackouts are not solely a Cuban problem. In the last month, similar cascading failures have struck in Bangladesh, Nigeria, and parts of India. The common denominators are heatwaves that push demand beyond capacity, and grids that lack redundancy. In high-rise cities, the concentration of demand amplifies the effect. A single substation failure can darken a district of 50,000 residents in seconds.
The Oxford paper has been circulated to the UK Cabinet Office and the National Grid. A government spokesperson said ministers were reviewing the findings. “We note the research and will consider its implications for our own infrastructure planning,” the spokesperson said.
The UK’s own power system has undergone stress tests this year following a near-blackout in July when a lightning strike took out two major transmission lines. The incident was resolved within minutes, but it exposed vulnerabilities in a network that is becoming more dependent on intermittent renewables. The National Grid has since accelerated plans to install battery storage and demand-response systems.
Thorne argues that the lesson from Cuba is not about the failure of a single plant, but about the fragility of interconnected systems. “We build cities as if the grid is always on,” she said. “We need to design for when it isn’t.”
