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Microsoft DUB03 (DB3) opened on 1 July 2009 as Microsoft's first data centre outside the United States. The $500 million building sits in Grange Castle Business Park, Clondalkin, west Dublin. It covers 303,000 sq ft over two storeys and serves Microsoft's cloud services across Europe, the Middle East and Africa.

Microsoft later joined DUB04 (112,000 sq ft, 2012) to the west end of the building and added DUB05 (169,000 sq ft, 2014) to the south. The three buildings total 584,000 sq ft.

Cooling

DUB03 was Microsoft's first data centre to rely on air-side economization. Rooftop air handling units push outside air into server rooms with no raised floor. Contained pods isolate the hot aisle, and the air handlers exhaust hot air through the roof. Evaporative cooling in the air handlers supports operation on the hottest days. Direct expansion (DX) backup units went unused in the first year of operation. The building uses no chillers.

Utility

ESB Networks built the Kilmahud 110 kV customer substation next to DUB03 to serve the campus. It switched in during January 2010. Before that, a dual radial medium-voltage supply from ESB's Grange Castle 110 kV station fed the building. EirGrid operates the transmission system. No behind-the-meter generation serves DUB03.

Backup Power

Fifteen diesel generators inside the building back up DUB03. Day tanks and two bunded bulk tanks north of the site, holding up to 250 m³ of diesel, supply them.

Campus

Microsoft has since built DUB06 through DUB15 on a second campus to the east and south within Grange Castle Business Park.