Energy transfer stations: heat, metered and sold
A data centre's biggest thermal liability is the heat it pays to throw away. An energy transfer station is the point where that stops — the custody-transfer skid where recovered heat is measured, conditioned and handed to a district energy network at 50 °C. Downstream of it, heat is no longer an operating cost. It is a metered product with a buyer.
How It Works
Where the heat comes from: Direct-to-chip liquid cooling returns water at roughly 45–48 °C. That is the single most important number on this page — air-cooled halls reject heat at temperatures too low to sell, whereas liquid cooling produces a return temperature a modern district network can actually use.
What the station does: Plate heat exchangers lift the return to a 50 °C supply and hydraulically separate the campus loop from the network loop, so neither side's pressure, chemistry or fault can propagate into the other. Metering sits at that boundary, which is what makes the heat a billable commodity rather than a favour.
Why 50 °C is the threshold: Fourth- and fifth-generation district networks are designed for low-temperature supply, which is precisely what makes data-centre heat viable now when it was not for older high-temperature systems. Stockholm's network already heats thousands of homes this way, and comparable schemes run in France, Sweden and the Netherlands.
Who takes it: A municipal or private district energy utility, a neighbourhood scheme, or an adjacent industrial or agricultural user — a greenhouse is an unusually good match, because its heat demand peaks in winter exactly when a network's does.
The station above moves heat from a campus to a network. The inverse is also possible: put the compute where the heat is needed. Compact liquid-cooled units sited in a building's mechanical room connect to existing hydronic heating, displacing a gas boiler and turning the building itself into the heat sink.
It suits a narrower set of sites — the building needs a genuine year-round thermal load, fibre, and space — and it is a different commercial structure, since the building owner is hosting compute rather than buying heat. Worth discussing where the fit is real.
Key Benefits
100% Fuel-Free Heating
Heat generated by AI servers replaces natural gas boilers. No combustion, no fuel delivery, no emissions.
Building Integration
Servers embedded directly in commercial and residential buildings eliminate the need for separate data centers.
Dual Revenue Streams
Buildings earn from AI compute services while reducing heating costs by up to 80%.
Net Zero Aligned
Directly supports Canada's 2050 net-zero goals by eliminating fossil fuel heating in urban areas.
Alignment with Canada's Net Zero Goals
Canada Green Buildings Strategy
Energy Transfer Stations support the federal goal of net-zero emissions buildings by 2050 through fuel-free heating.
Direct alignment with building decarbonization targetsClean Electricity Regulations
By using grid electricity for compute (which generates heat), we leverage Canada's increasingly clean grid.
Supports grid decarbonization goalsFederal Carbon Pricing
Buildings using waste heat avoid carbon costs entirely, creating economic advantages that grow with carbon prices.
Economic incentive alignmentProvincial Building Codes
BC, Quebec, and other provinces are banning gas in new buildings. Waste heat provides a proven alternative.
Regulatory compliance pathwayGreco Energy's Vision
Led by Leo Paskalidis, we're deploying Energy Transfer Stations in Canadian cities where heating demand is high and natural gas is the dominant fuel. By integrating AI compute with building heating, we create a new infrastructure category: buildings that earn revenue while decarbonizing.
Two public services from one electrical input
Why recovered data-centre heat at roughly 50 °C needs less heat-pump lift than lower-temperature sources, and what that means for a district energy network.
Read the transcript
GRECO's objective is to create two useful public services from one electrical input: advanced digital computation, and usable thermal energy under suitable operating conditions.
Recovering heat that would otherwise be rejected can increase total useful energy utilisation by up to 100% compared with electricity-only use. This does not make the electrical grid itself 100% efficient. It improves overall system utilisation by converting waste heat into a productive municipal resource.
At approximately 50 °C, recovered data-centre heat is a higher-grade source than lower-temperature raw sewage heat. It can require less heat-pump temperature lift and less electrical input before entering a district energy system.
All viable sources of waste heat should be mapped, measured and integrated. Data centres, sewage facilities, industry, transit and buildings can work together instead of rejecting valuable energy.
Recovered heat can displace fossil-fuel boilers, reduce greenhouse gas emissions, and support homes, schools, hospitals, public facilities and year-round urban agriculture.
Battery storage, UPS systems and flexible on-site generation can manage peak demand and strengthen community resilience.