Power Outage at CHU Liège: Emergency Systems Activated Amid European Heatwave

A widespread power outage struck the CHU Liège university hospital (Sart Tilman campus) on Monday morning, June 29, 2026, causing elevators and parking barriers to stop functioning. Hospital staff activated emergency protocols, and backup generators seamlessly took over critical operations, ensuring no patients were harmed. The incident occurred as Belgium grappled with a severe European heatwave that had placed the country’s electrical grid under significant strain.

Context: A Hospital Under Pressure

CHU Liège is the only academic hospital in Wallonia, French-speaking Belgium, employing over 7,000 professionals and serving more than 700,000 outpatients annually. The Sart Tilman campus houses over 600 hospital beds across nearly 40 care units, making it a critical piece of the region’s healthcare infrastructure. According to RTBF, the outage was caused by a technical fault involving a transformer at the Sart Tilman electrical substation, operated by Elia, Belgium’s high-voltage grid operator.

The Outage and Emergency Response

The power failure struck in the morning hours, immediately halting elevators and parking barriers across the campus. Backup generators activated automatically, ensuring continuity of essential medical services. A second transformer at the substation seamlessly took over from the failed unit, and power restoration was underway by midday.

Olivier Rubay, spokesperson for CHU Liège, confirmed that all emergency procedures functioned as designed. “All procedures worked. It’s restarting. For the elevators, all people who were trapped have been evacuated,” Rubay told RTBF. No injuries or patient harm were reported, and all individuals trapped in elevators were safely evacuated by hospital staff.

The Heatwave Connection

The outage did not occur in isolation. Belgium and much of Europe were in the grip of a severe heatwave, with temperatures exceeding 30°C. Just three days earlier, on June 26, RTBF reported that the Belgian electrical grid was “under tension” due to the extreme heat. Elia had been forced to reduce high-voltage line capacity by 10-15% because of line dilation caused by the heat. Underground cables were also affected, as heat caused the ground to shift, leading to cable faults and small outages.

Electricity consumption had risen approximately 10% — comparable to winter levels — due to widespread air conditioning use, while production capacity dropped as thermal and nuclear plants faced cooling constraints. RESA, the local distribution grid operator in Liège province, confirmed numerous small outages linked to heat-induced ground movement.

Analysis: Critical Infrastructure Vulnerability

The incident at CHU Liège highlights the vulnerability of critical infrastructure to power disruptions, even when backup systems function correctly. The hospital’s response was effective — backup generators activated automatically, redundant transformer systems took over, and all trapped individuals were safely evacuated. However, the fact that a major hospital experienced any disruption at all underscores the risks posed by aging infrastructure under climate stress.

The broader context is concerning. As heatwaves become more frequent and intense due to climate change, the strain on electrical grids — and by extension, critical facilities like hospitals — will increase. Elia’s proactive measures, including reducing line capacity and enhanced monitoring, likely prevented more widespread outages. But the transformer failure at a hospital substation demonstrates that localized risks remain, particularly when infrastructure is pushed to its limits by extreme weather.

What’s Next

Power was fully restored by midday on Monday, and the hospital returned to normal operations. The incident will likely prompt reviews of backup power systems at critical facilities across Belgium, particularly as the summer heatwave season continues. Questions remain about the exact nature of the transformer fault and whether the extreme heat was a direct contributing factor. Elia has not yet released a detailed technical analysis of the failure.

For now, the CHU Liège hospital — and its patients — can count themselves fortunate that a well-rehearsed emergency protocol prevented what could have been a far more serious situation.