This was Cuba's third nationwide power grid collapse in March 2026. Not a localised outage. Not a scheduled maintenance interruption. A complete systemic failure, in which the entire national grid lost synchronisation and shut down, plunging eleven million people into darkness. By the morning of 22 March, the state-run Electric Union reported that some 72,000 customers in Havana had been reconnected, including five hospitals. The precision of that number — 72,000 out of a capital city of two million — told its own story. The restoration was partial, fragile, and provisional.

To understand why Cuba's lights keep going out, one must look past the immediate technical failures — a turbine trip here, a transmission line fault there — and confront the deeper architecture of a crisis decades in the making. Cuba's power generation fleet consists largely of Soviet-era thermoelectric plants built in the 1970s and 1980s, designed for a lifespan of thirty years and now operating well into their fifth decade. These plants were engineered to burn Soviet crude oil, which is no longer available. They now run on a diet of Venezuelan heavy crude, when Venezuela can spare it, supplemented by whatever fuel Cuba can purchase on international markets with hard currency it does not possess in sufficient quantities.

The Venezuelan lifeline, once robust, has frayed. Venezuela's own oil production, which peaked at 3.3 million barrels per day in the late 1990s, has collapsed to roughly 900,000 barrels per day, a consequence of mismanagement, sanctions, and underinvestment that mirrors, in fossil fuel terms, the entropic decay afflicting Cuba's grid. The subsidised oil shipments that sustained Cuba through the Chávez era have dwindled. Havana must now compete on the open market for fuel it cannot afford, to burn in plants that cannot efficiently use it, to serve a population that cannot do without it.

The human toll is not abstract. Cuba's healthcare system — once the pride of the revolution, a genuine achievement in universal access and preventative medicine — functions on electricity. Vaccines require refrigeration. Dialysis machines require power. The archipelago's geography means that when the national grid fails, there is no neighbouring country's grid to draw from, no cross-border interconnector to provide emergency supply. Cuba is, electrically speaking, an island in every sense.

The economic consequences compound upon themselves in ways that outsiders rarely appreciate. When the grid collapses, food spoils in refrigerators and commercial freezers across the island. Small businesses — the cuentapropistas who represent Cuba's tentative experiment with private enterprise — lose inventory and revenue. Hotels catering to the tourism sector, Cuba's primary source of foreign exchange after remittances, cannot operate. The cascading losses from a single day of nationwide blackout have been estimated by Cuban economists at between $50 million and $80 million — a staggering figure for a nation whose total GDP is approximately $107 billion.

For those who follow energy infrastructure across the Global South, Cuba's predicament is extreme but not unique in its essential dynamics. Ageing generation assets, insufficient investment, fuel supply vulnerability, and growing demand create a cocktail of fragility that manifests differently in different nations but shares common ingredients. Pakistan's grid has experienced repeated load-shedding crises. South Africa's Eskom has subjected the continent's most industrialised economy to years of rolling blackouts. Lebanon's national utility provides as little as two hours of electricity per day in some regions, with citizens relying on private diesel generators that cost more than the official tariff.

India, which endured its own devastating grid collapses in 2012 — the largest blackout in history, affecting 620 million people across twenty-two states — invested heavily in generation capacity, transmission infrastructure, and renewable energy in the decade that followed. India's installed generation capacity now exceeds 440 gigawatts, with renewable sources accounting for roughly forty per cent. The comparison is instructive not as a judgement but as an illustration: grid resilience requires sustained capital investment at a scale that Cuba's economic constraints have made impossible.

The geopolitical dimension cannot be separated from the technical one. Cuba's economy operates under a United States embargo that has been in force, in various forms, since 1962 — the longest-running economic sanctions regime in modern history. The embargo restricts Cuba's ability to purchase spare parts, generation equipment, and fuel on international markets. It limits foreign investment in Cuban infrastructure. It cuts the island off from the financing mechanisms — development bank loans, export credit agencies, multilateral funds — that other nations use to modernise their energy systems. One need not endorse the Cuban government's domestic policies to recognise that the embargo's contribution to the infrastructure crisis is direct and measurable.

Havana's own choices have also contributed. Decades of centralised economic planning, resistance to foreign investment in the energy sector, and a bureaucratic culture that privileges political loyalty over technical competence have left the grid in the hands of institutions that lack the resources and, in some cases, the expertise to maintain it. The recent modest economic reforms — permitting small private businesses, expanding internet access, allowing some foreign investment — have not extended meaningfully to the power sector, which remains under state control.

What is playing out in Cuba is not a temporary crisis that will resolve when a particular turbine is repaired or a shipment of Venezuelan crude arrives. It is the visible manifestation of systemic decay — the slow-motion failure of an infrastructure that was built for one geopolitical reality and is now operating in another, without the resources to bridge the gap. The three collapses in March are not aberrations; they are the new normal, and the intervals between them are shrinking.

In Havana, residents have adapted with the grim ingenuity that characterises life under sustained adversity. Families keep charcoal stoves alongside electric ones. Medications are stored in insulated coolers. Neighbours coordinate to share generator fuel. The coping mechanisms are impressive and heartbreaking in equal measure, because they represent not resilience in the inspirational sense but resignation — the acceptance that the state cannot provide what it has promised, and that survival is an individual rather than a collective project.

The lights came back on for 72,000 Havana households on the morning of 22 March. For the rest of the island, the wait continued. And in the gap between those two facts — between partial restoration and full recovery — lives the truth of Cuba's energy crisis: not a blackout but a dimming, slow and steady and showing no signs of reversal.