Summary
- EnergiRaven and the Association for Decentralised Energy want new UK data centres above 1MW to include infrastructure that allows useful heat to be exported.
- The proposal would require heat recovery to be considered when AI Growth Zones are planned, rather than attempted after facilities are commissioned.
- Useful heat recovery still depends on nearby demand, network infrastructure, temperature, commercial arrangements, and planning coordination.
EnergiRaven and the Association for Decentralised Energy are calling for new UK data centres above 1MW to include infrastructure that allows useful heat to be exported before the facilities become operational.
The proposal would push heat recovery into the design and planning of a data centre rather than leaving operators and heat network developers to attempt a connection after the facility has been commissioned.
The organisations also want AI Growth Zones planned around waste heat capture and argue that data centres should be treated as assets within the wider energy system, rather than solely as large electricity consumers.
The campaign reflects a simple physical reality. Almost all electricity consumed by IT equipment eventually becomes heat that has to be removed from the building. In most facilities, that thermal energy is released to the atmosphere through the cooling system.
Recovering it is technically possible, but useful heat reuse depends heavily on the location and design of the site. A data centre needs a nearby and sufficiently consistent demand for heat, infrastructure to move the energy, suitable operating temperatures, and commercial arrangements that determine who pays for the connection and who is responsible for maintaining supply.
Those constraints help explain why heat reuse announcements have historically been easier to make than operational schemes. A data centre can be designed so that recoverable heat is available at the site boundary, but it cannot create a district heating customer nearby if no suitable network or demand exists.
EnergiRaven’s proposal attempts to address that sequencing problem. Installing the necessary connection infrastructure during construction can avoid some of the cost and disruption of modifying the site later. Planning AI Growth Zones alongside heat networks could also place large sources and consumers of heat within the same infrastructure strategy from the outset.
The proposal also sits within a wider European shift towards greater scrutiny of data centre energy performance. European energy efficiency rules have increased reporting requirements, while the use of recovered heat is becoming a more regular consideration during planning and environmental assessment.
In Britain, the Association for Decentralised Energy has pushed for greater use of heat from industrial facilities and data centres as part of a wider expansion of heat networks. The organisation argues that large quantities of usable energy are discarded even as heating remains one of the country’s largest sources of energy demand.
The engineering question is not simply whether heat exists, but at what temperature. Traditional air cooling often produces relatively low temperature waste heat, which may require a heat pump before it can be useful in a district heating network. Direct liquid cooling can improve the opportunity by collecting heat closer to processors and, in some designs, at a higher temperature.
Cooling design therefore has a direct effect on the economics of heat reuse. As AI workloads increase adoption of direct liquid cooling, some new facilities may be able to offer a more useful source of heat. That only creates value if an external network is ready to receive it.
Any planning requirement would still need to distinguish between making heat available and proving that a viable customer exists. Requiring an unused connection at every site could add capital cost without delivering useful energy recovery.
A more practical approach would require developers to demonstrate that heat reuse has been assessed, preserve a realistic route for a future connection, and coordinate new facilities with heat network zones where demand can be aggregated.
The current proposal has not been adopted as government policy. It nevertheless adds pressure to the planning debate around AI infrastructure by asking developers to treat rejected heat as part of the facility’s utility design at the same stage as electricity, cooling, water, and fibre.
If that principle enters planning policy, heat recovery would move from an optional sustainability project towards a normal part of determining whether a data centre can be integrated effectively with the infrastructure around it.
