The US tech company Google (GOOGL ) has announced that it has made its biggest corporate purchase of renewable energy ever. This include 1600 megawatt package of wind and solar agreements and 18 new energy deals. According to Google more than 2 billion dollars will go to building new infrastructure in the US, Europe and Chile.

– These renewable energy purchases aren’t only notable for their size. Up to now, most of our renewable energy purchases in the U.S. have been wind-driven, but the declining cost of solar (down more than 80 percent in the past decade) has made harnessing the sun increasingly cost-effective. Meanwhile, our Chile deal marks the first time we’ll buy power in a hybrid technology deal that combines solar and wind. Because the wind often blows at different times than the sun shines, pairing them will allow us to match our Chilean data center with carbon-free electricity for a larger portion of each day, Google says in its press release.

The purchase is equivalent to the capacity of a million solar rooftops the Google CEO Sundar Pichai said.

Other tech companies are also announcing their climate change mitigation actions and energy efficiency plans before the next weeks UN Climate Change meetings. For example Amazon (AMZN) has said it will run only by renewables by 2030 and is targeting carbon-neutral by 2040.

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