Summary
- Pure DC's planning material provides for about 10MW of waste heat to be exported from DUB01B.
- HeatGrid Ireland's proposed Ballycoolin heat network remains at an early concept stage.
- The current data centre works are designed to remain compatible with future district-heating pipework rather than deliver the full network now.
Pure DC has agreed to make about 10MW of waste heat available from its proposed DUB01B data centre development in Ballycoolin to a district-heating project being developed by HeatGrid Ireland.
The arrangement appears in planning material submitted as part of Pure DC’s expansion proposals in Dublin 15. The operator has signed an exclusivity agreement to work with HeatGrid, which wants the data centre to become a heat source for an adjacent network serving industrial customers.
The network is not yet an operating heat-reuse system. HeatGrid chief executive David Connolly described the Ballycoolin scheme as being at a very early concept stage, meaning the 10MW figure represents prospective recoverable heat rather than heat already being delivered to customers.
Pure DC’s current design is intended to preserve the option. Planning material says the DUB01B scheme will make provision for future district-heating integration, including space and access for pipework and associated equipment. The district-heating pipework itself is not part of the current construction scope.
That separation is significant because heat reuse from a data centre requires infrastructure on both sides of the site boundary. The facility can provide a source of relatively low-temperature heat, but a network still needs pipes, customers, pumping infrastructure and usually heat pumps or another means of raising the temperature to a useful level.
HeatGrid’s proposed network would focus on industrial customers in the Ballycoolin area. The developer is backed by Asper Investment Management and is also pursuing other Irish district-heating projects, including a Galway scheme that received planning permission in August.
Pure DC’s existing Ballycoolin campus has been operational since 2024. The company describes the site as a 14-acre development designed to provide 54MW across three data centre buildings, with an additional 25 acres acquired in 2023 that could support a further 90MW subject to power and permitting.
The operator says the existing campus uses a closed-loop water system and reports an average annualised PUE of 1.21. It also says connections are already in place to allow district heat to be supplied to the local community, although the proposed HeatGrid arrangement is tied to the developing DUB01B configuration.
Heat recovery has become a recurring condition and design objective for European data centres, but the engineering is only one half of the problem. Large facilities produce substantial quantities of heat continuously, while economically useful district-heating schemes require nearby demand with a sufficiently dependable load profile.
Temperature is another constraint. Waste heat leaving a data centre cooling circuit is normally much cooler than heat from combustion or waste-to-energy plants. Heat pumps can raise it to the temperature required by a district network, but doing so consumes electricity and adds capital equipment, maintenance and operating cost.
The result is that a data centre can be technically ready to export heat for years before a viable network exists. Designing pipe routes and connection points into the facility during construction is substantially easier than retrofitting them later, but those provisions should not be confused with an operating heat-reuse scheme.
Dublin provides a useful test environment because data centre load is concentrated around several industrial clusters while Ireland’s district-heating sector remains comparatively young. A waste-heat supply of around 10MW is large enough to support meaningful local demand if HeatGrid can assemble the customer base and finance the network infrastructure needed to move that heat.
The next milestones therefore sit largely outside the data hall: planning, funding, energy-centre design, customer commitments and construction of the distribution network. Pure DC’s agreement establishes a prospective heat source. Turning it into useful heat will depend on whether HeatGrid can build the physical system around it.
