The Lake-Powered Hospital : Lessons from Geneva’s Sustainable Healthcare Blueprint

This article was exclusively written for The European Sting by Mr. Lorenzo Impellizzeri, a third-year medical student at the University of Geneva. He is affiliated with the International Federation of Medical Students Associations (IFMSA), cordial partner of The Sting. The opinions expressed in this piece belong strictly to the writer and do not necessarily reflect IFMSA’s view on the topic, nor The European Sting’s one.

The transformation of healthcare institutions from carbon-intensive giants into leaders of the ecological transition is no longer a peripheral goal—it is a clinical necessity. In this global race toward “Net Zero,” the Geneva University Hospitals (HUG) have emerged as a premier governance model. By adopting a “Planetary Health” framework, HUG is demonstrating that the interdependence between environmental stability and human well-being can be managed through rigorous institutional strategy.

Thermal innovation : tapping Lake Geneva

HUG’s 2030 Sustainability Strategy moves beyond incremental changes to implement systemic infrastructure overhauls ; the centerpiece is its integration into the GeniLac project, a massive 30-kilometer underground hydrothermal network. By utilizing deep-water thermal exchange from Lake Geneva, the hospital has effectively decoupled its growth from fossil fuel consumption.

The results are a benchmark for urban hospital complexes: an 80% reduction in electricity consumption for cooling and a corresponding 80% drop in CO2 emissions for heating.

Green surgery : decarbonising the operating theater

While infrastructure is vital, the most profound innovation touches the core of hospital activity: the act of care itself. Recognizing that medical and care activities account for 43% of the hospital’s carbon footprint, HUG launched the Ecological Transition in Care (TES) strategy.

A critical victory within TES is the targeted reduction of inhaled anesthetic gases, such as desflurane, which have a global warming potential thousands of times greater than CO2. HUG committed to reducing the use of these gases by 70%, requiring significant modifications to anesthetic protocols and comprehensive medical training. Furthermore, through the “Choosing Greenly” project, healthcare professionals are empowered to evaluate the environmental impact of their therapeutic and logistical choices, prioritizing medical devices with the lowest polluting life cycles.

The Scope 3 Challenge: Circular Procurement

HUG’s transparent carbon footprint analysis reveals that purchasing—primarily medications and medical supplies—constitutes 60% of total emissions, representing the institution’s greatest challenge. To address this Scope 3 impact, HUG is actively applying sustainability criteria to supplier dialogues and integrating circular economy principles.

By internalizing waste management, the hospital exercises complete control over its value chain, and in 2024, HUG reduced its total waste volume to 5,266 tonnes, achieving a recycling rate near the 50% objective. Impressively, the weight of dangerous medical waste was reduced by 23.5% in a single year.

Leading the Way Forward

The metrics confirm that the strategy is working. In 2024, HUG achieved a 5% absolute reduction in total greenhouse gas emissions (totaling 103,314 tonnes of CO2), even as patient volume and care activities continued to rise.

For the international medical community, the Geneva model serves as a vital case study: high-acuity university medicine and elite ecological standards are not mutually exclusive. As we train the next generation of healthcare leaders, the “Geneva Blueprint” proves that a sustainable hospital is not just a policy goal—it is a functional reality.

Lorenzo Impellizzeri

About the author

Lorenzo Impellizzeri is a third-year medical student at the University of Geneva and the National Public Health Officer for the Swiss Medical Students’ Association (swimsa). A passionate advocate for public health and environmental sustainability, he coordinates nationwide health campaigns and focuses on driving the transition towards a greener, more resilient and fairer healthcare system.