Data centres enable everything we do online, from powering the internet to making digital communication and connection possible. As a building use in the built environment, data centres have a comparable high energy use, water use and emissions. The sector is working hard to reducing all three so what does it really mean for a data centre to be sustainable? Simply put, a sustainable data centre is one that minimises its environmental impact while still providing reliable and secure data processing and storage services. It involves prioritising energy efficiency, utilising renewable energy, conserving water and reducing waste. This round table explores these themes and the importance of sustainable data centres.