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Any analysis on the climate impact of a data center should consider resource utilization and energy efficiency, in addition to power mix. Carbon emissions are a factor of three things: the number of servers running, the total energy required to power each server, and the carbon intensity of energy sources used to power these servers. A recent blog post by Jeff Barr outlines why using fewer servers and powering them more efficiently is at least as important to reducing the carbon impact of a company’s data center as its power mix.

A typical large-scale cloud provider achieves approximately 65% server utilization rates versus 15% on-premises, which means when companies move to the cloud, they typically provision fewer than ¼ of the servers than they would on-premises.1 In addition, a typical on-premises data center is 29% less efficient in their use of power compared to a typical large-scale cloud provider that uses world-class facility designs, cooling systems, and workload-optimized equipment.2 Adding these together (fewer servers used plus more power efficient servers), customers only need 16% of the power as compared to on-premises infrastructure. This represents an 84% reduction in the amount of power required.

This massive improvement in energy efficiency drives a huge reduction in climate impact because less energy consumed means fewer carbon emissions. The climate impact improvements get even better when you factor in that the average corporate data center has a dirtier power mix than the typical large-scale cloud provider. Large-scale cloud providers (AWS included) use a power mix that is 28% less carbon intense than the global average.3

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Combining the fraction of energy required with a less carbon-intense power mix, customers can end up with a reduction in carbon emissions of 88% by moving to the cloud and AWS.

Read more here.

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We’ve made a lot of progress on this commitment. As of April 2015, approximately 25% of the power consumed by our global infrastructure comes from renewable energy sources. By the end of 2016, we intend to reach 40%.

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Amazon Wind Farm Fowler Ridge is a 150 megawatt wind farm in Benton County, Indiana. This wind farm is expected to generate approximately 500,000 megawatt hours of wind power annually (as of January 1, 2016) – or the equivalent of that used by approximately 46,000 US homes4 in a year.

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Amazon Solar Farm US East is a 80 megawatt solar farm in Accomack County, Virginia. This solar farm is expected to start generating approximately 170,000 megawatt hours of solar power annually as early as October 2016 – or the equivalent of that used by approximately 15,000 US homes4 in a year.

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Amazon Wind Farm US East is a 208 megawatt wind farm in Perquimans and Pasquotank counties, North Carolina. The wind farm is expected to start generating approximately 670,000 megawatt hours of wind energy annually starting December 2016, or enough to power more than 61,000 US homes4 in a year. When completed, it will be the first utility-scale wind farm in the state of North Carolina.

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Amazon Wind Farm US Central is a 100 megawatt wind farm in Paulding county, Ohio. The wind farm is expected to start generating approximately 320,000 megawatt hours of wind energy annually starting in May 2017, or enough to power more than 29,000 US homes in a year4

The energy generated by Amazon Wind Farm US Central, Amazon Wind Farm US East, Amazon Solar Farm US East and Amazon Wind Farm Fowler Ridge will be responsible for delivering more than 1.6 million MWh of additional renewable energy annually into the electric grids that supply current and future AWS Cloud data centers. The energy produced from these projects is enough to power roughly the equivalent of 150,000 U.S. homes annually, which is slightly larger than the size of the city of Cleveland, Ohio.5

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AWS and Dominion Virginia Power join forces on a landmark renewable energy delivery deal. With this, Dominion Virginia Power will manage and integrate the energy produced from various Amazon wind and solar farm projects onto the grid that serves AWS datacenters. Read the Rocky Mountain Institute blog here for more details.

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Amazon joined Apple, Google, and Microsoft in filing an Amicus Brief that supports the continued implementation of the U.S. Environmental Protection Agency’s Clean Power Plan (CPP) and discusses the technology industry’s growing desire for affordable renewable energy across the U.S. Read the brief here.

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As of January 1, 2016, Amazon Wind Farm Fowler Ridge is live and producing electricity! This marks the first of our four announced renewable energy projects to move into full operation. Read the blog here

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AWS announced that it has contracted with EDP Renewables to construct and operate Amazon Wind Farm US Central. Read the press release here

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Read this blog for our perspective on effective public policies for renewable energy and how to spur more investment in renewables.

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Amazon joined the Buyer’s Principles to collaborate with more than 40 other companies on making clean energy solutions more affordable and accessible to all.

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AWS announced that it has contracted with Iberdrola Renewables, LLC to construct and operate Amazon Wind Farm US East. Read the press release here.

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AWS announced that it has teamed with Community Energy, Inc. to construct and operate Amazon Solar Farm US East. Read the press release here.

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AWS announced a 4.8 megawatt hour pilot of Tesla’s energy storage batteries in its US West (Northern California) Region. Batteries are important for both data center reliability and as enablers for the efficient application of renewable power. They help bridge the gap between intermittent production, from sources like wind, and the data center’s constant power demands. For more information, please see the Tesla press kit here.

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Amazon announced that it has joined the American Council on Renewable Energy (ACORE) and will participate in the U.S. Partnership for Renewable Energy Finance (US PREF) to increase its work with state and federal policymakers and other stakeholders to enable more renewable energy opportunities for cloud providers. For more information, please see the ACORE blog post here.

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AWS announced it has teamed with Pattern Development to construct and operate Amazon Wind Farm Fowler Ridge. Read the press release here.

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AWS shared its long-term commitment to achieve 100 percent renewable energy usage for the global AWS infrastructure footprint.

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AWS began its journey to carbon neutrality in 2011 when it opened its first carbon-neutral region. Today, AWS offers four separate carbon-neutral regions for customers to utilize (Canada coming soon); and in doing so, we hope to do our part to help tip the scales in the environment's favor.

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1 Source: NRDC 2014 “Data Center Efficiency Assessment” report

2 Source: Power Usage Effectiveness (PUE) of on-premises data centers from 2014 Uptime Institute study and PUE of cloud data centers from Google and Facebook public disclosures plus AWS internal data, all of which show PUEs under 1.2

3 Source: AWS average power mix carbon intensity of 393 grams/kWh for June 2015 and 2014 Global Energy Mix data from the International Energy Agency for on-premises assumptions

4 In 2012, the average annual electricity consumption for a U.S. residential utility customer was 10,837 kWh, an average of 903 kilowatt hours (kWh) per month

5 Source: Dividing the population of Clevland, Ohio (389,521 in 2014) by the average number of persons per household between 2009-2013 (2.6 according to the US Census), you get 149,815 homes