Microsoft DUB05 is the third data centre on Microsoft's original Grange Castle campus in Clondalkin, west Dublin. It sits just south of the connected DUB03 and DUB04 buildings.
Microsoft announced the €170 million ($230 million) expansion in December 2013 and completed it in spring 2014. The single-storey building covers 15,700 m² (169,000 sq ft). It brought the original campus (DUB03 to DUB05) to 54,255 m² (584,000 sq ft) of buildings and total investment to €594 million.
Rooftop air handling units cool the data halls with outside air through an air-to-air heat exchanger. The units run in dry mode about 95% of a typical year. An evaporative mode supports them on the hottest days. The building uses no chillers.
ESB Networks serves the campus from the Kilmahud 110 kV customer substation, built next to DUB03 and switched in during January 2010. EirGrid operates the transmission system. West Dublin's grid is constrained, and later Microsoft buildings at Grange Castle needed on-site gas generation. No behind-the-meter generation serves DUB05.
Fifteen containerised diesel generators with integrated belly tanks back up DUB05, in a generator yard south of the building. Microsoft is trialling hydrotreated vegetable oil (HVO) as a diesel substitute across DUB03 to DUB05.
Microsoft has since built DUB06 through DUB15 on a second campus to the east and south within Grange Castle Business Park.
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| NN milesInterested in this information?Contact us | Tower TwoInterested in this information?Contact us |
Microsoft's second Dublin data centre, a 112,000 sq ft single-storey Gen 4 modular building joined to the west end of DUB03 at Grange Castle, online at the end of 2012.
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| NN milesInterested in this information?Contact us | North ValleyInterested in this information?Contact us |
Microsoft's first data centre outside the US, a 303,000 sq ft two-storey building at Grange Castle in west Dublin, opened July 2009.
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| NN milesInterested in this information?Contact us | EdgeConnex DUB04 |
Ireland's national planning board, An Coimisiun Pleanala, has given the green light for two data centers in Dublin, overturning a 2023 decision by the local council to refuse permission.
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| NN milesInterested in this information?Contact us | Edgeconnex Dublin |
EdgeConnex initially built a 4,500sqm data centre (DUB01) in 2016 and later extended that facility further before adding a new 1,500sqm data hall in 2017.
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| NN milesInterested in this information?Contact us | CoreInterested in this information?Contact us |
One of two two-storey Microsoft data centres, with DUB15, at the west end of the Grange Castle campus in Dublin. Its first of five data halls went live in July 2023.
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| NN milesInterested in this information?Contact us | Hub OneInterested in this information?Contact us |
One of two two-storey Microsoft data centres, with DUB14, at the west end of the Grange Castle campus in Dublin, supported by an on-site gas generation compound.
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| NN milesInterested in this information?Contact us | Edgeconnex: DUB02 |
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| NN milesInterested in this information?Contact us | West PlazaInterested in this information?Contact us |
One of four identical single-storey Microsoft data centres (DUB09, DUB10, DUB12, DUB13) at Grange Castle in west Dublin, operating by 2020.
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Campus exterior and data hall photography for this operator.
Campus exterior and data hall photography for this operator.
Campus exterior and data hall photography for this operator.
Microsoft uses Containers (called ITPACs) to build out its data centers. These Containers are Shipping Containers fitted with all the necessary climate control, networking, server racks and other hardware necessary to be a “mini” data center all in one.
An Azure region is a set of data centers deployed within a latency-defined perimeter and connected through a dedicated regional low-latency network.
With more global regions than any other cloud provider, Azure gives customers the flexibility to deploy applications where they need to. Azure is generally available in 46 regions around the world, with plans announced for 8 additional regions.
An Azure geography is a discrete market, typically containing two or more regions, that preserves data residency and compliance boundaries.
Geographies allow customers with specific data-residency and compliance needs to keep their data and applications close. Geographies are fault-tolerant to withstand complete region failure through their connection to our dedicated high-capacity networking infrastructure.
Availability Zones are physically separate locations within an Azure region. Each Availability Zone is made up of one or more data centers equipped with independent power, cooling, and networking.
Availability Zones allow customers to run mission-critical applications with high availability and low-latency replication.
September 11, 2026 Microsoft Azure
Microsoft plans to more than triple its data center capacity over the next five years, targeting 38GW by 2032, up from its current 12GW. The capacity will combine Microsoft-owned facilities with leased capacity from third-party providers, including neoclouds such as CoreWeave, Nscale, Lambda,...
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August 04, 2026 Microsoft Azure
Swiss startup Exclaim Robotics, founded by a former Microsoft engineer, has raised $4.95 million in pre-seed funding to develop autonomous robots for AI data center maintenance. Backed by Founderful and Playfair, the company aims to automate remote hands tasks such as cleaning optics,...
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July 14, 2026 Microsoft Azure
Pure DC has launched the first phase of its Seinäjoki, Finland, data center project, with Microsoft reportedly among the customers leasing capacity at the site. The initial phase will deliver 110MW of capacity with an estimated investment of $1.7 billion. Pure DC has been developing plans for the...
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July 10, 2026 Microsoft Azure
Microsoft reported a 25 percent year-on-year rise in carbon emissions, with total Scope 1, 2, and 3 emissions increasing to 20.29 million metric tons of CO₂e as data center expansion accelerated. The company said the jump was largely due to its decision to stop using unbundled renewable energy...
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July 04, 2026 Microsoft Azure
National Grid Ventures (NGV), the commercial arm of National Grid, has acquired a 35% stake in Joulent for $1.75 billion to support development of power infrastructure for large data centers. The investment will help fund Project Kilby, a 2.67GW natural gas facility being developed with Chevron....
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