Zaragoza has a giant "fridge" under its streets: it has been running for 30 years and is the geothermal envy of Europe

Zaragoza is advancing as a European benchmark for urban geothermal use.

IGME-CSIC presented THERMAL, a tested system to better coordinate heat pumps that use the city’s aquifer without drilling new wells.

The Ebro alluvial aquifer has supplied stable water at about 18°C for decades, helping heat and cool buildings.

Smart, coordinated management can cut costs and CO2 per installation while protecting the resource from overuse.