Website : www . greenmountain . no The fjords aren ’ t just natural works of art , they ’ re also excellent sources for hydroelectricity . The aptly named Green Mountain data centre in the northern city of Stavanger sources water directly from the fjord , and uses gravity to pump it in . Therefore , the centre uses no energy in order to bring in the water that cools its servers . Since the water is a cool 46 ° Fahrenheit at any time of year , Green Mountain has a PUE of just 1.2 .

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