Key Takeaways

  • A McMaster University professor urged policymakers to treat data centre waste heat as a viable energy resource in new Hamilton projects.
  • Developers including s2e Technologies and Slate Asset Management signaled interest in integrating heat-recovery systems.
  • Market research and regulatory trends suggest heat harvesting could reduce emissions and grid strain if adopted early in project design.

Data centres do not usually grab attention for what they release into nearby streets, yet the conversation in Hamilton has shifted toward exactly that. As the city debates a pause on new data centre development, the heat these facilities generate has become a focal point for industry, researchers, and local residents. The question, at least for now, is whether Hamilton can turn a perceived liability into an energy advantage.

A professor in McMaster University's department of mechanical engineering has spent years analyzing the heat that modern digital infrastructure throws off. These facilities concentrate vast arrays of chips that convert electrical power into computational work and then into heat. If unmanaged, that heat spills into the surrounding environment. If captured, however, it can serve as a local energy resource. The researcher noted in Ottawa this spring that 70% of the energy Canadian buildings use goes into space and water heating, and much of that energy escapes as exhaust. This prompts a simple question: why allow so much heat to disperse unused when new systems could retain and redistribute it?

Part of the change in tone comes from the broader sector. The International Energy Agency projects that global data centre electricity consumption could double by 2030 as AI workloads expand, and cooling remains one of the major contributors to that demand. Studies cited by groups like the Building Decarbonization Coalition have found that thermal energy networks can route captured hot water through a district and reduce building-level fossil fuel consumption. These networks are relatively common in parts of Europe, but they remain far less common in Canada.

Hamilton is already a test case for how these ideas meet local politics. City councillors have discussed slowing new projects while they sort out planning guidelines, and residents have raised questions about water use and environmental impact. At the same time, major project proponents have indicated they want heat-recovery systems to play a role. The CEO of s2e Technologies previously stated the team is evaluating how waste heat from a proposed McMaster-adjacent facility could support neighbouring heat pumps. That scenario offers McMaster's research team an on-the-ground opportunity to refine real-world models.

Elsewhere in the city, Slate Asset Management has been studying how a data centre at its Steelport site might integrate with Hamilton Community Enterprises, the city-owned telecom and energy operator. The project's materials describe an opportunity to offer tenants a lower-cost stream of decarbonized heat while potentially delivering recovered heat into downtown buildings. A feasibility study previously determined that industrial heat reuse at the Bayfront is technically and commercially workable.

Analysts who follow energy systems echo these points. Reports from organizations like McKinsey note that roughly 40% of a typical data centre's electricity consumption goes into cooling equipment rather than compute tasks. Cooling by liquid loops or immersion tanks makes the waste heat easier to harvest. Meanwhile, the Building Decarbonization Coalition highlights how thermal energy networks reduce peak grid loads. These networks sometimes repurpose older district heating infrastructure and can link apartment complexes, hospitals, and industrial shops to a shared hot-water circuit.

Not everything about the Canadian landscape makes this easy. Researchers point out that the country has only 217 thermal networks providing 2.2% of the national heating supply. By contrast, Europe has more than 6,000 such networks serving over 100 million people. That comparison has become a recurring touchpoint in conversations about where Canada hopes to position its energy infrastructure. The adoption gap suggests a clear opportunity for expansion, but also hints at why Canadian municipalities are moving cautiously.

Whatever the pace, the policy environment is shifting. The MaRS Discovery District released an analysis in March 2026 recommending that new Canadian data centre developments include energy-mitigation features, such as heat-recovery systems. The advice fits within larger discussions about energy planning and urban design. European regulations already require most large data centres over 1 MW to capture and reuse waste heat, with Germany mandating at least 10% reuse from 2026 and 20% by 2028. Canadian municipalities may eventually adopt a similar approach.

There is also the community lens. Hamilton saw protests in early June at a planning tribunal meeting tied to a Slate Asset Management application involving a land division that could affect where a facility gets built. A Ward 3 city councillor has argued that a short-term pause gives municipal leaders room to plot how operators should run future data centres. Sustainability and renewable energy have been positioned as baseline expectations. These debates are not unique to Hamilton; they are happening as AI infrastructure moves into mid-size cities that must weigh growth against environmental concerns.

Still, there is a practical angle playing out behind the scenes. Data centre heat, if routed into residential towers or industrial shops near the harbour, could moderate heating bills for tenants. Developers sometimes view reduced emissions profiles as a way to secure permits in challenging markets. Harvest Systems, a McMaster spinout, has focused primarily on heat recovery from commercial appliances, but the company's principles transfer to the larger thermal flows produced in data centre buildings. International examples, such as Deep Green in the United Kingdom and Vicinity Energy in Maryland, underscore that capturing heat for community use can create stable revenue streams.

If Hamilton moves forward with a moratorium, it raises the question of whether a pause risks slowing the adoption of the very strategies that would make these sites cleaner, or if it forces operators to adopt better designs before breaking ground. Researchers suggest that Hamilton has the chance to model how Canadian cities integrate modern digital infrastructure with emerging thermal networks. Developers have expressed interest, the city is assessing its options, and engineering experts continue pressing for an approach that treats waste heat as an energy asset rather than an unwanted byproduct.