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HOME Sustainability Environment Green of NRI Data centers that boast advanced environmental performance


Data centers that boast advanced environmental performance

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NRI has established an environmental management system at all of its data centers and obtained ISO14001 international standard certification concerning its environmental management system. In March 2013 we received ISO14001 certification of our Tokyo Data Center I as well, which we opened in November 2012.
At Tokyo Data Center I we achieved a substantial reduction in energy consumption by adopting our "double-deck system," which can be hailed as the shape of data centers to come, and combining multiple energy saving technologies based this system.

Tokyo Data Center I PUE*: 1.28 (design value), the highest level in the industry

  • PUE (Power Usage Effectiveness) is an indicator to show how efficiently a data center uses energy; the value is calculated by dividing the total amount of energy used by a data center facility by the energy delivered to computing equipment.
    The standard data center PUE is said to be about 2.0.

NRI's "double-deck system" is the shape of data centers to come

With each passing year, the densification and performance of equipment installed at data centers to handle the flow from sources such as virtualization and the transition to cloud computing are increasing. This change has been accompanied by increased amounts of heat produced by the equipment, and how to cool devices to ensure stable operation has become an ever greater challenge. On the other hand, problems such as the increase in energy consumption resulting from excessive cooling are also having an adverse effect on the environment.

The "double deck" system is a system that completely separates the floor where the server equipment is placed and the floor where facilities-related equipment such as the air-conditioning and power supplies are installed.

Separating heat-generating sources from the cooling system makes it possible to achieve highly efficient and flexible air conditioning, and greatly reduce power consumption.

double-deck system

Use of natural energy

NRI has introduced free cooling or high-temperature chilled water* to achieve a substantial reduction in power consumption for air-conditioning by using the low external air temperatures during winter and mid-season operations to produce chilled water without the use of refrigeration units.
NRI is also working to reduce its environmental impact to the maximum extent possible through the use of natural energy, including solar power systems and geothermal heating systems.

*Water temperature of around 14 ~ 15℃. Electricity consumption can be kept in check more efficiently than with the cold water of around 7℃ that is normally used.

solar power systems
geothermal heating systems

Energy savings and efficiency improvements

NRI is working to improve air-conditioning efficiency by combining task air-conditioning to provide zone cooling for high-temperature spaces with ambient air-conditioning, which cools an entire computer room to an average temperature.
We're also striving to eliminate unnecessary power consumption by introducing motion sensors and lighting sensors in computer rooms and office spaces.


Maintenance of landscapes and coexistence of with neighborhood areas

We have sought to harmonize Tokyo Data Center I with the surrounding area by setting the entire building into sloping land to maintain the landscape and utilizing exterior wall greening and a rooftop gardening.

maintain the landscape.
rooftop gardening

NRI receives Green IT Award 2013 from Minister of Economy, Trade and Industry

NRI's Tokyo Data Center I, which garnered high marks for its advanced environmental performance, was presented with a Green IT Award 2013 by Japan's Minister of Economy, Trade and Industry.

The "Green IT Awards" are commendations for excellent products, technologies and activities that contribute to the achievement of a low carbon society and are presented by the Green IT Promotion Council in two categories for "savings in IT-related energy consumption" and "energy conservation through the use of IT" as part of its efforts to accelerate the Green IT Initiative.

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