The recent and extremely important discussion of the plan to build a data centre in the Point Tupper Business park is too often portrayed in the the public discussion as take it or leave it proposition.
My education in the 70's as an electrical engineer nudged me to ask the question "How much of the electrical power used by data centers is converted to heat?" My physics professor might argue "all of it eventually" (See First Law of Thermodynamics ). The engineering question is how much of this heat can be captured for heating nearby buildings and how can we design a system to make it happen?
Ironically, the technology that invites me to "Google" an initial response to my design question depends on the very technology we sometimes question the need to have.
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How It Works
First Law of Thermodynamics: Electrical energy entering a data center does not disappear. As servers, storage drives, and network gear process information, nearly all that electricity turns directly into heat. [1, 2, 3, 4]
Signals and Transmission: A tiny fraction of energy leaves the facility as light or radio signals (less than 0.1%), and those signals eventually dissipate into heat when they reach their destination. [1, 2]
The Cooling Multiplier: Because computing generates massive heat, data centers run heavy cooling systems (like air conditioners and water pumps) that consume additional electricity. That cooling electricity also ultimately converts into heat and gets expelled into the environment. [1, 2, 3]
Total Thermal Output: Because of this dual power draw, a data center outputs essentially the full thermal equivalent of every watt of electricity it pulls from the grid (and sometimes more when counting total system lifecycle or co-located power sources). [1, 2]
Would you like to know more about how data center waste heat is captured for district heating or how cooling systems work to manage it?
ScienceDirect.com Waste heat utilization of data centers based on heat pump ... DCs consume large amounts of electricity, with approximately 90% of this energy being converted into heat, ...
Environmental and Energy Study Institute (EESI) Thermal Energy Networks Turn Data Center Waste Heat into a ... Key Takeaways: The U.S. energy sector has a data center problem. In 2023, data centers accounted for 4.4% of the nation's energy...
Energy Innovation How Much Energy Do Data Centers Really Use? How Much Energy Do Data Centers Really Use? Network devices connect the data center to the internet, enabling incoming and outgoing...
How data center waste heat is captured
Data center waste heat is captured primarily by replacing open-air or evaporative cooling systems with closed-loop liquid or air-to-water heat exchangers that siphon thermal energy into a distribution network. [1, 2]
The Heat Capture Process
Closed-Loop Cooling Systems: Rather than blowing hot air outside or letting water evaporate into open cooling towers, modern data centers use sealed liquid loops—such as water circulating through server racks or direct-to-chip cooling plates—to absorb heat directly from the hardware. [1]
Air-to-Water Exchangers: For traditional air-cooled facilities, hot exhaust air is funneled through "hot aisles" and passed across an air-to-water heat exchanger, which transfers the warmth into a secondary liquid loop. [1]
Temperature Boosting via Heat Pumps: Server exhaust and coolant loops typically produce "low-grade" heat (ranging from 25°C to 60°C / 77°F to 140°F), which is too cool for standard building heating. Utility-scale heat pumps are used to upgrade this thermal energy to higher temperatures (often 70°C to 90°C) required by municipal grids. [1, 2, 3, 4]
District Heating Networks (DHNs): The upgraded hot water is pumped through insulated underground pipelines to heat nearby residential homes, commercial offices, public pools, or industrial facilities. [1, 2, 3, 4]
Real-World Examples
Finland (Microsoft & Fortum): A massive waste heat recovery collaboration captures heat from data centers to supply up to 40% of the district heating needs across Espoo, Kauniainen, and Kirkkonummi, warming thousands of local homes.
Canada (Markham & Toronto): Facilities like the Equinix data center in Markham, Ontario, route recovered thermal energy through Markham District Energy to warm local condominiums, schools, and university buildings. In Toronto, Telehouse collaborates with Enwave Energy to blend deep-lake cooling with waste-heat reuse.
France (Equinix & Paris): Data center heat recovery has been utilized to warm public infrastructure, such as heating the pool for the Paris Olympics. [1, 2, 3, 4]
The design work for the explore the economic payback and costs of retrofitting a data center for heat recovery, or look at regulatory mandates (such as the EU Energy Efficiency Directive) that now require it?
A massive data centre to provide computing power for the artificial intelligence giant Anthropic is in pre-construction just outside Port Hawkesbury in Cape Breton. Now is the time to advocate for a design that provides for additional benefits in use of the data centre heat by-product for commercial and residential energy cost reduction!
References
Thermal Energy Networks Turn Data Center Waste Heat into a. (n.d.). Environmental and Energy Study Institute | Ideas. Insights. Sustainable Solutions. Retrieved October 20, 2026, from https://www.eesi.org/
Waste heat utilization of data centers based on heat pump. (n.d.). ScienceDirect.com. Retrieved October 20, 2026, from https://www.sciencedirect.com/science/
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