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Greening Our Data Centers

The Internet  Data Center  (IDC) is of  fundamental significance  to Baidu,  as it powers  our products  and services uninterruptedly throughout  the year, provides  services  for over one  billion users,  and is  capable of  carrying trillions  of search  queries,  tens of billions of positioning data, and tens of billions of image and video data. To mitigate the energy consumption of these  high-intensity data centers,  Baidu  is committed  to creating  green,  low-carbon,  energy-saving  and environmentally-friendly  IDCs.  Vigorously promoting the construction, operation  and maintenance of green data  centers and through continuous optimization  of scheduling, Baidu replaces  old  servers, exits  high-consumption  IDCs, and  increases the  share of  self-built IDCs.  At the same  time,  Baidu improves energy efficiency and reduces GHG emissions through continuous technological innovation and iteration.

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In 2020, the annual average PUE of Baidu’s self-built data centers has reached 1.14, with its infrastructure energy consumption down 76% compared to the  industry average of 1.59, and  the annual average PUE of its most energy-efficient data  center reaching as low as 1.08, putting Baidu in an industry-leading position in energy conservation and emissions reduction. In 2020,  Baidu completely  optimized data  center layout  with resource integration through R&D of related IDC and cutting-edge network technologies; meanwhile,  Baidu established a modern operation platform and  system to ensure the high-quality,  high-efficiency and low-cost operation of our data centers.

Besides,  Baidu’s IDCs  have actively  adopted energy-saving lighting equipment and  increased  the proportion of clean energy use. In 2020, Baidu purchased 45 million kWh of wind  power and generated 293,000 kWh  of photovoltaic power via our rooftop photovoltaic power systems; Baidu established new  data centers in areas such as Yangquan and Yizhuang which all adopt energy-saving LED lights for lighting; We renovated the heating, ventilation and air-conditioning  in our  offices to improve  their efficiency.

In addition, Baidu  implemented the first  solution in China  that combines non-cavity floor, precise ventilation wall cooling, optimized gas flow, as well as  a high-temperature chilled water system, so that the natural cooling  accounts for more than 94% throughout the year. For  the first time, Baidu  applied wastewater recovery and reuse technologies.The technologies  adopted by the Baidu Yangquan Data Center Phase I can reduce the amount of sewage discharged per day by  1,328 tons and enable the water  cooling system to achieve a water retention rate of 44.8%.After ultrafiltration and desalination, wastewater will be  turned into qualified cooling water and will be reused in the refrigeration system. This creates a virtuous cycle that is eco-friendly and can facilitate the sustainable use of water resources.

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33Power usage effectiveness (PUE) is a commonly used global metric for the energy efficiency of a data center. PUE is the ratio of the total energy used by a data center to the energy delivered to ICT equipment. A PUE value near 1.0 would indicate high energy efficiency in the data center and less energy consumption and losses of Non-ICT equipment.