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.
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.
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.