US cloud firm Rackspace is opening a new 130,000 square foot data centre on a 15 acre site in Crawley, West Sussex.

The Texan-headquartered company, which already has two data centres near Heathrow, London, claimed the Crawley data centre adheres to unparalleled efficiency standards.

Built in conjunction with data centre specialists Digital Realty, the facility will be the first in the UK to make use of innovative 'indirect outside air' cooling technology, which removes the need for mechanical cooling and means that the energy required to operate the data centre will be reduced by up to 80 percent.

Construction for the initial outlay, providing 6MW across two data halls, started today and is due to be delivered in the first half of 2015 but Rackspace said it plans to open two more data halls and revealed there is enough room on the campus to expand to 20MW-30MW. 

Rackspace COO Mark Roenigk told Techworld: "Operational efficiency and environmental efficiency is extremely important so we appreciate Digital Realty's open minded approach to helping us tune a data centre to our needs."

Defending Rackspace's decision not to build a mega data centre, Roenigk said: "We see a 10-12 percent efficiency gain [in technology] year-over-year so we like to start one building, fill that up, and then move to the next building."

Digital Realty CEO Michael Foust told Techworld: "This relationship fits in very well with our overall corporate strategy of delivering cloud-based facilities for our customers."