Fujitsu is the latest firm to build a green datacentre, spending £44m on its new London site.
Fujitsu said the 65,000-square-foot datacentre will have a low carbon footprint as a result of using new IT-cooling and processing technologies, saving enough electricity to power as many as 6,000 homes every year - equivalent to saving 10,000 tonnes of carbon dioxide each year.
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The new datacentre will be used by companies and public bodies in the UK and continental Europe.
Other green datacentres have recently been announced by other companies in Manchester and London.