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  5. Improve Power Usage Effectiveness (PUE) at Our Data Centers

Improve Power Usage Effectiveness (PUE) at Our Data Centers

Our Approach

Energy consumption at data centers is increasing due to the spread and growth of cloud computing, and society is paying greater attention to the environmental performance of data centers.

Data centers account for 25% of the CO2 emissions (FY 2018) for each business in the Fujitsu Group, and the annual rate of increase for CO2 emissions at our 34 main data centers in Japan and around the world has been around 2.0% over the five years from FY 2013 until FY 2018. Since data center CO2 emissions are expected to continue increasing along with the growth of cloud business, it is the social responsibility of the Fujitsu Group to work toward having environmentally-friendly data centers. At the same time, it has also become an important topic to look at from a long-term perspective in terms of enhancing our business infrastructure.

The Fujitsu Group has designated roughly 80% of all Group data centers (relative to the area of server rooms) for this activity*1, and is working to achieve better environmental performance.

*1 Data centers for the activity
Globally, data centers with area of 1,000m2 or more, or data centers for which business divisions have requested for inclusion.

FY 2018 Performance and Results

Targets under the Fujitsu Group Environmental Action Plan (Stage VIII) Last Fiscal Year
(FY 2018 results)
Improve PUE at data centers by 8% or more. (compared to FY 2013) PUE 1.59 - Improvement of 6.7%

Actions to Achieve the Goal

Activities to improve PUE*2 are under way at data centers in Japan and around the world, based on the Fujitsu Environmental Action Plan. With effects from the global heat wave in FY 2018 also a factor, we were unable to reach the target improvement rate with the scope and speed of improvements thus far, but improvements have consistently been at least 1% each year. Working mainly on improving the efficiency of air conditioning, energy use has been made more efficient and power usage by facilities and ICT has been continuously reduced thanks to fine-tuning type operational improvements such as longer hours using outdoor air and maximum use of free cooling, plus the implementation of revolutionary AI technologies.

We are also working to expand our use of renewable energies to make progress toward the “carbon-free society” sought under the Paris Agreement.*3

*2 PUE (Power Usage Effectiveness):
An index for power usage effectiveness at data centers. Expresses overall power consumption at data centers as a value divided by the power consumption of servers and other ICT devices. The closer the number is to 1.0, the greater the efficiency.

*3 Paris Agreement:
A new framework to counteract global warming by reducing greenhouse gases through international cooperation, with participation by over 190 developed and developing countries. The agreement entered into effect in November 2016.

PUE values and calculation methods
PUE Value PUE calculation method, other
Range: 1.31 to 3.04
No. of data centers: 34
  • Apply The Green Grid
  • Work to implement improvements using DCMM

Examples of Initiatives in FY 2018

Driving Improvements by Enhancing Information Linkage with Overseas Data Centers

We developed the *4 Data Center Evaluation Tool which analyzes whether the cooling energy for ICT devices at data centers is being managed efficiently.

This initiative had been conducted before at data centers in Japan, but in FY 2018 it was rolled out to main data centers overseas, and optimization proposals were made. Additionally, information is being shared on company intranet websites and face-to-face meetings are also being held in order to connect and bolster improvement activities with overseas locations.

To facilitate smoother improvements, we are planning to compile evaluation methods and expertise gained at each site into guidelines which we plan to share with the Fujitsu Group.

*4 A tool that uses analysis based on heat and airflow balance from the structural and equipment specifications of data centers to calculate potential energy reduction amounts, as well as optimization proposals for PUE improvements and the related effects

Data Center Evaluation Tool (Evaluation Example)

Expanding Use of Renewable Energy

We are also currently working to shift in stages toward the use of renewable energies to supply the power used in our data centers, based on our in-house environmental vision for the creation of a carbon-free society which we published in May 2017. Implementations are particularly progressing in overseas locations where green power procurement is possible. Renewable energy now accounts for 19% of all the power used at our 34 main data centers in Japan and around the world.

Most of those are overseas data centers, and we plan to continue to actively increase usage of renewable energies at overseas data centers.