Microsoft DUB15 is one of two two-storey data centres, with DUB14, at the west end of Microsoft's Grange Castle campus in Clondalkin, west Dublin. They sit west of DUB09, DUB10, DUB12 and DUB13.
Microsoft won permission for both buildings in May 2021. DUB15 covers 28,173 m² (303,200 sq ft). It followed DUB14 into service and was running by early 2025. Microsoft has fitted heat recovery equipment in one of its data halls to capture waste heat.
Cooling
Rooftop air handling units cool the data halls with outside air. Evaporative cooling, fed by recycled rainwater, runs only above about 24°C.
Utility
ESB Networks serves DUB14 and DUB15 through the campus substation and ESB's Corkagh 110 kV station. EirGrid operates the transmission system. West Dublin's grid is constrained, so DUB15 has its own gas generation compound under ESB's flexible-demand policy.
Backup Power
Temporary generators running on hydrotreated vegetable oil (HVO) provide backup while the full gas plant awaits a high-pressure gas supply.
Campus
Microsoft runs twelve data centres at Grange Castle, from DUB03 (2009) to DUB15, plus the stand-alone DUB11.