Data Centres, Heat Recovery and the route to Net Zero

This white paper highlights how the rapid growth of data centres—driven by cloud computing and AI—threatens Net Zero goals but also creates an opportunity to dramatically improve efficiency by treating waste heat as a valuable resource. By integrating solutions such as microgrids, combined heat and power, advanced cooling, and heat reuse for cooling, district heating, or agriculture, data centres can “use the watt twice,” achieving efficiencies above 85% while reducing emissions, grid pressure, and water use. Ultimately, the paper argues that smart location choices and integrated design decisions will be more critical than policy alone in delivering truly sustainable data centres.

WHAT YOU WILL LEARN

In this paper, you will learn how:

Most data centre electricity becomes waste heat, making heat recovery the largest lever for efficiency and decarbonisation.
Reusing waste heat via CHP, heat pumps and microgrids can push total energy efficiency above 85%.
Microgrids with CHP provide a practical near‑term route to resilience, lower emissions and future fuel flexibility.
AI and high‑density computing will accelerate the shift from air cooling to liquid and immersion cooling.
Data centre location and early design choices determine whether sustainability gains are achievable at scale.

MORE ABOUT WHAT IS IN THIS WHITE PAPER

This white paper argues that rapidly growing data centre energy demand—driven by cloud services, AI, and electrification—poses a major challenge to achieving Net Zero, but also presents a significant opportunity if waste heat is treated as a resource rather than a by‑product. It highlights that less than 10% of a data centre’s energy is used for computation, with the rest lost as heat, and proposes “using the watt twice” through integrated design approaches such as microgrids, combined heat and power (CHP), advanced cooling (adiabatic, liquid, and immersion), battery storage, and emerging technologies like fuel cells. By capturing and reusing waste heat for on‑site cooling, district heating, or agriculture, data centres can dramatically improve overall system efficiency—potentially exceeding 85%—while reducing grid strain, emissions, and water use. The paper concludes that location, early-stage design, and pragmatic commercial decisions will be more decisive than policy alone in making data centres both efficient and genuinely sustainable on the route to Net Zero.