Google has set itself an energy target of operating carbon-free by 2030. In Europe, 84 per cent of its energy is renewable, “and improving”, according to Karl Byrne, who negotiates energy agreements for Google in Ireland and the UK. But Google has the same renewable energy problem everyone else has: Where to find electricity when the sun doesn’t shine, and the wind doesn’t blow? And it’s a growing problem – Google data centres require six times more processing power than they did six years ago. While wind and solar “remain core”, said Byrne at a recent energy storage conference, Google…

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