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Social Challenge 1
Moving toward a decarbonized society


Why it matters

The NTT Group views one of its core roles as helping to resolve environmental issues that society faces, and is continuing its existing activities aimed at reducing greenhouse gas emissions. There are increasingly high hopes that the ICT sector will be able to help resolve environmental issues, and this has been outlined in the Paris Agreement. The NTT Group remains committed to measures that utilize ICT services and cutting-edge technology to reduce greenhouse gas emissions.

What can be accomplished

The NTT Group is committed to initiatives that reduce greenhouse gas emissions throughout its business activities and society as a whole, by rolling out IOWN technology and increasing development and use of renewable energy sources.

Future vision

The NTT Group is pushing ahead with research and development aimed at curbing climate change, encouraging employees to take part in nature conservation activities, increasing awareness inside and outside the group of its activities that help improve the environment, and many other activities to contribute to a reduction in greenhouse gas emissions throughout society as a whole.

Message from Management(Executive Vice President, Head of Research and Development Planning)

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Promoting Sustainability based on the IOWN Concept

The NTT Group has created the Sustainability Charter based on the philosophy of "Self as We" to guide us in contributing to the well-being of the planet, society and people everywhere. At the heart of this Sustainability Charter is our IOWN (Innovative Optical and Wireless Network) Concept, a future communication infrastructure that will enable environmentally friendly, sustainable growth and diversity-tolerant total optimization. This concept is characterized by ultra-high capacity, ultra-low latency, and ultra-low power consumption, which is made possible through adoption of photonic and other innovative technologies.

Three Technological Layers that Constitute IOWN

IOWN comprises three main technology components: "All-photonic networks" communications infrastructure that uses photonic-based technologies for everything from networks to terminals; the "Cognitive Foundation®" for optimal matching of all manner of ICT resources and distributing necessary information inside the network; and "Digital Twin Computing" for analyzing and feedback processing in real-time using physical world models recreated in cyberspace. In other words, IOWN a new communication infrastructure enabling for enormous communications bandwidth through the use of photonics-based communications infrastructure, technology with multi-orchestration capabilities for low-latency control of information within the network, and interactive connectivity with communications between the real world and cyberspace.


IOWN Concept for Reducing Environmental Impact and Achieving Well-being

IOWN also contributes significantly to reducing the environmental impact on the planet, as outlined in the Sustainability Charter. The NTT Group has already successfully developed optical semiconductors (optical nonlinear devices) with the world's lowest energy consumption, using nanostructures called photonic crystals that can control the speed that light is confined. The results of this development were published in "Nature Photonics" in 2019. Optical semiconductors have minimal electrostatic capacity and operate with an extremely low current, and have been developed with significantly lower energy loss when converting between optical signals and electrical signals. These results are slated to be applied in the future for forming light transmitting circuits on silicon chips, and developing opto-electronic integrated optical transmitter receiver and modules. The next step of development will be to replace all chips with optical semiconductors, such that the functions of CPUs, GPUs, storage, memory, and other devices are all based on photonics. Connecting all devices with optical signals essentially means building a new type of low power consumption computing architecture that extends far beyond that of mere server boxes. IOWN aims to improve power efficiency by 100 times by maximizing the use of such optical technology.

And as processing power increases, computations required for interactions between digital twins and for long-term forecasting of their behavior will become available, leading to highly accurate future prediction and resolution of various social issues. The NTT Group views happiness not as an instantaneous event but, rather, as an integral value that can be sustained from the past into the future. By harnessing the immense computing power of IOWN, the NTT Group aims to deliver comprehensive and sustainable happiness to society as a whole. Indeed, IOWN will help achieve well-being for all members of society. In addition to rolling out this IOWN Concept, the NTT Group remains committed to the diversity and consistency of future research topics, and will work with its various operating companies as well as industry players in a broad range of sectors to help resolve various social issues and achieve a sustainable society.

Business Activity 1
Promoting energy conservation

Our commitment

The NTT Group is committed to converting its corporate fleet to electric vehicles (EV) and improving the energy efficiency of its operations (EP100・EV100)

Our objectives

Two times

2025: Power efficiency (compared to FY2017)


2030: Ratio of EV adoption in Japan

Pursuing Initiatives across the Industry for Energy-Efficient ICT Devices

NTT is a member of the Telecommunications Carrier Association (TCA) and in that capacity, participates in the ICT Ecology Guideline Council*1,an organization that seeks to enhance the energy ef f iciency of telecommunications-related products. The council formulates guidelines on the criteria for evaluating the energy efficiency of telecommunications devices, and NTT has contributed to the technical aspect of this effort. The NTT Group's Energy Efficiency Guidelines are based on the guidelines created by this council. In August 2010, eight NTT Group companies*2 acquired the Eco ICT Logo on submitting self-evaluations of their CO2 emissions reduction efforts, including the establishment of Energy Efficiency Guidelines. The Eco ICT Logo was created by the ICT Ecology Guideline Council to signify efforts by telecommunications service providers to reduce CO2 emissions. We will continue to drive the development and procurement of energy-efficient equipment, and work with the ICT Ecology Guideline Council to help bring both vendors and carriers together to promote the industry-wide procurement of energy-efficient equipment. We will ensure that vendors are consistently provided with requirements for NTT Group specification processes, and include energy efficiency information disclosure and our corporate stance on energy efficiency in our criteria for selecting vendors.

Group-Wide TPR Campaign to Reduce Electricity Usage

The NTT Group has been working on Group-wide energy conservation activities named the TPR (Total Power Revolution) Campaign since October 1997 with respect to the electricity it consumes, which accounts for over 90% of the CO2 emissions from its business activities. By promoting efficient energy management at buildings owned by NTT and installing energy-efficient electrical power units, air conditioning systems and telecommunications equipment, we managed to continue to reduce electricity usage across the NTT Group by approximately 380 million kWh from projected levels in fiscal 2020.

Energy-Saving Data Centers

NTT Communications of fers data centers with a PUE*3 of less than 1.2, and NTT COMWARE offers data centers with a PUE of less than 1.1, which are at the top worldwide for energy efficiency. We are striving to enhance PUE for our other data centers as well, introducing five-star equipment with the highest level of energy ef ficiency in accordance with the NTT Group Energy Efficiency Guidelines. NTT FACILITIES has been developing technology for reducing the electricity consumption of data centers by incorporating higher efficiency technology for electrical power
units and air conditioning systems as well as central air conditioning control systems.

Promotion of EP100 & EV100

The NTT Group is committed to using power more efficiently as a means of reducing the risk of business disruptions and mitigating climate change. It has set itself the target of improving power efficiency per data transmission of the telecommunications business including data centers to double fiscal 2017 levels by fiscal 2025. It is also committed to reducing its corporate fleet and converting to electric vehicles (EV). We will replace 50% of our general-purpose vehicles with EV by 2025 and 100% of our fleet by 2030. Accordingly, we are establishing battery charging stations for EVs on the grounds of our telecommunications buildings.

To demonstrate our commitment to the public, in October 2018 NTT became the first telecommunications operator in the world to become a member of the Climate Group's EP100*4 and EV100*5 initiatives. In May 2020, we established the Electric Vehicle Promotion Consortium in a joint effort with Hitachi, Ricoh, and Tokyo Electric Power to expand the use of electric vehicles in the commercial sector. Looking ahead, we will promote the shared use of vehicles, decarbonization in the area of mobility, use of EV at times of a disaster, and initiatives related to systems and regulations.

  1. ICT Ecology Guideline Council: An organization established jointly by the Telecommunications Carriers Association, Telecom Services Association, Japan Internet Providers Association, Communications and Information Network Association of Japan and ASP-SaaS-IoT Cloud Consortium to drive industry-wide efforts to address the issue of global warming.
    ICT Ecology Guideline Council
  2. The eight NTT Group companies are NTT, NTT East, NTT West, NTT Communications, NTT DOCOMO, NTT DATA, NTT FACILITIES, and NTT COMWARE.
  3. Power Usage Effectiveness: PUE is calculated by dividing the total power consumption of a data center by the power consumption of the computing equipment it houses. It is a figure larger than 1, with higher efficiencies represented by values approaching 1.
  4. EP100: An international initiative comprising companies pledging to double the energy efficiency of their operations (improve energy efficiency by 50%) as participants.
  5. EV100: International initiative for promoting commercial use of EV and development of the service environment.

Business Activity 2
Reduction of power consumption by introducing IOWN technologies

Our commitment

The reduction in power consumption resulting from rolling out IOWN will help reduce greenhouse gas emissions throughout the NTT Group's its business activities and society as a whole

Our objective

Reduce power consumption with the introduction of IOWN, and reduce the NTT Group's greenhouse gas emissions *1 compared to outcome.

  1. GHG Protocol: for Scope 1 and 2

Background and Concept

There is urgent need to create a society that can cope with global environmental changes such as climate change, major disasters, and pandemics. Developing next-generation energy technologies and technologies to enable resilient environmental adaptation will reduce the burden placed on the global environment and thereby prevent environmental destruction, opening the door to a sustainable society in which humans can continue to live in harmony with the environment.

The NTT Group is committed to initiatives that reduce power consumption emissions throughout its business activities and society as a whole, by rolling out IOWN technology and increasing development and use of renewable energy sources.

Initiatives for Realizing the IOWN Concept

The development of ICT has dramatically increased the volume of information being transmitted through networks. Up to now, energy has been saved by enhancing power efficiency through the introduction and renewal of highly energy-efficient telecommunications equipment. However, the performance and efficiency of integrated circuit technology which has grown in line with Moore's law, is thought to be approaching its limits in terms of speed and energy consumption due to the restrictions of nanoscale fabrication and integration density. NTT Laboratories is advancing research and development that incorporates optical technology into signal processing with the aim of using photonics to realize a base for a new kind of computing. This has resulted in the development of a modulator with the lowest ever reported energy consumption and an optical transistor which transfers a high-speed optical signal to another light with gain (announced in April 2019).

The NTT Group is advancing the development of photonic technology and we have established the IOWN (Innovative Optical & Wireless Network) concept as one of the pillars of an all-photonic network that incorporates photonic-based technology throughout entire networks, including terminals. The target of this all-photonic network will be to realize power efficiency that is 100 times greater in areas where photonics technology is applied, and we expect it will radically reduce energy consumption. We are collaborating with global partners and specialists in a wide range of research and technological fields with the aim of realizing the IOWN concept.

Promoting Energy Conservation with IOWN

Conservation of the global environment and development of a sustainable society is the management theme of countless companies. The use of the NTT Group's next-generation communication platform "IOWN" for various ICT services used at customer companies not only helps to support these initiatives, but using IOWN extensively throughout NTT Communications' data centers, networks, and other infrastructure will lead to energy savings, paving the way to achieve carbon neutrality at data centers and networks by fiscal 2030.

Higher efficiency and lower power consumption using light


Highlighting the reduction in power
consumption and other benefits of
IOWN to the government

The NTT Group highlighted to the Japanese government the benefits of using its IOWN advanced technology, as a cutting edge communications infrastructure with major future potential for developing businesses in a wide range of fields.

Rolling out IOWN to reduce power consumption and help achieve carbon neutrality provides Japan with a significant opportunity to lead the world in this sector.


Looking to the Future: IOWN

NTT R&D is envisaging the arrival of new smart societies that are not yet possible with today's Internet, with features such as mobility as a service (MaaS) for extreme fail-safe systems and entertainment services offering deep immersion. To realize such smart societies, we will require innovation that cannot be achieved merely by extending the trajectory of current technologies; we will need to realize ultra-low power consumption, high-speed signal processing, and the fusion of virtual worlds that can equal or surpass reality with sophisticated prediction technologies. The NTT Group has proposed the Innovative Optical and Wireless Network (IOWN) concept to realize new smart societies, and we are committed to realizing this concept.

In January 2020, the IOWN Global Forum was established in the United States by industry leaders NTT, Intel Corporation, and Sony Corporation, all three of which have superior expertise in the technological areas that form the core of IOWN. Wideranging recruitment efforts began in March 2020, with many companies both in Japan and overseas signing up as members, and specific technological considerations commenced through the use of online video conferencing. Going forward, we will work with a variety of partners for the earliest possible implementation of the IOWN concept.

Three Technological Layers that Constitute IOWN

Cognitive Foundation®

We seek to achieve optimal matching of all manner of ICT resources and distributing necessary information inside the network. We will lead the shift from a world of electronics to a world of photonics and drive technological development for resolving various global social issues and creating innovative services.

Technology development roadmap for realizing the IOWN concept

NTT proposes the "Digital Twin Computing Initiative"

All-Photonics Network

Photonics technology is applied not only to networks but also to information processing to achieve large-capacity, ultra-low power consumption and ultra-high-speed data transmission that had been difficult in the past. We can provide multiple functions that serve as the backbones of social infrastructure without mutual interference by assigning a function to each wavelength on a single optical fiber.

Digital Twin Computing

We combine highly precise digital information reflecting real-world objects, such as things, people and societies, to achieve large-scale, high-accuracy predictions and simulations of the future, and enable extremely advanced, real-time interactions between things and people in cyberspace.

Advantages of the All-Photonics Network





Research and Development to Support the IOWN Concept

By using light as a means for transmitting signals inside the processors that perform information processing and calculations inside a computer, we hope to create a hybrid opto-electrical processor that will solve problems that arise with electrical processing, such as power consumption and increase in heat emission, and realize ultra-low power consumption and high-performance information processing. We have realized ultra-compact photo-electric conversion elements such as an optical transistor that uses ano-photonics technology.

To conduct a comparative time experiment by connecting several optical lattice clocks that are more precise than atomic clocks, the current standard for measuring seconds, we used the optical fiber network of NTT East for an optical frequency transmission experiment with the University of Tokyo. As a result, the required frequency precision for the comparative experiment was achieved, representing a major step toward conducting the experiment.

Increasing the Capacity of Optical Fiber Communication Networks

Increasing the capacity of mission-critical optical fiber communication networks has become an economic necessity. We have developed new proprietary technology for digital signal processing and ultra-wide area optical devices, increasing the channel capacity per wavelength to the point that transmission speeds achieve a level more than 10 times that of current commercial systems, and achieving a global first of 1 Tbps of capacity in long-distance wavelength-division multiplexed transmission trials. Furthermore, we also succeeded in developing an ultra-high-speed compact optical front-end module with integrated compact, wide-band InP optical modulator.

As another accomplishment, we realized highcapacity wireless transmissions at approximately 10 times the speed of LTE and Wi-Fi, and five times that of 5G, by using the following two technologies.

The first one enables wireless transmissions at rates of 100 Gbps by using a method devised by NTT combining a principle called "OAM multiplexing" with MIMO technology. This generates multiple radio waves of different frequencies so that they can transmit simultaneously without interfering with the each other. The result is a dramatic increase in the volume of data that can be transmitted simultaneously, enabling large-capacity communications.

The second one, which was jointly developed with the National University Corporation Tokyo Institute of Technology, enables wireless transmissions of 100 Gbps in the 300 GHz band. It is easier to expand the transmission bandwidth or terahertz waves, including the 300 GHz band, although they require high-performance devices. We developed an ultra-high-speed integrated chip (IC) for wireless frontend devices, leading to the world's first 100 Gbps wireless transmission in the 300 GHz band.

Optical Transistor Capable of High-Speed Operation with Ultra-low Powteer Consumption

As Moore's law approaches its limit in electronic circuits, there are expectations for a new, high-speed, energy-saving computing platform that incorporates optical technology. Achieving this requires technologies that have hitherto been considered difficult to achieve with low energy consumption, such as opto-electronic signal conversion and high-speed signal processing in the optical area. NTT has been developing a semiconductor nanostructure called photonic crystals with which to realize various tiny optical devices. In this work, we used our nanotechnology to realize a nano electro-optic modulator (E-O converter) and a nano photodetector (O-E converter) with extremely small capacitance and low energy consumption. Moreover, through their integration, we also realized an O-E-O conversion optical transistor. These nano-optical technologies have opened the way to realizing high-speed, low-energy integrated opto-electronic information processing.

Business Activity 3
Developing and expanding the use of renewable energy

Our commitment

Developing and promoting greater use of renewable energy

Our objective

Increase the use of renewable energy, and reduce the NTT Group's greenhouse gas emissions*1 compared to outcome*2.

  1. GHG Protocol: for Scope 1 and
  2. The introduction of effectively 100% renewable energy (including actual renewable energy through non-fossil fuel certificates) will have the optimal types of energy determined on the basis of each country's energy composition, etc. Approximately half of the domestic renewable energy usage is anticipated to be from energy sources owned by NTT (FY2030).

Development of Renewable Energies

Renewable energy like solar power, wind power, geothermal, and biomass do not generate greenhouse gases when producing power, an advantage that makes developing and expanding the use of renewable energy an essential part of initiatives aimed at achieving a decarbonized society. The NTT Group established NTT Anode Energy in June 2019 with the aim of delivering smart energy solutions that leverage the technology, expertise, and resources of the NTT Group. Focused on achieving a decarbonized society and the promotion of local energy production for local consumption, NTT Anode Energy operates on three core approaches: (1) Providing customers with green energy solutions; (2) Promoting NTT's own decarbonization efforts; and (3) Utilizing battery farms to increase use of renewable energy.

NTT Anode Energy is working together with various partners to develop renewable energy power plants in order to meet the green energy requirements of NTT Group companies. With a primary focus on sustainability, the company advancing development that takes into consideration ecosystems and living environments.

The power generated from renewable energy at these plants is supplied to customers in a range of different plans catering to their specific requests. This is achieved through a corporate PPA (Power Purchase Agreement), where customers use the electrical power generated from renewable energy power plants constructed on their sites or in remote locations. Leading companies focus on the "Additionality" concept, where companies are encouraged to make investments in renewable energy projects as their selected source of financing, as a way of displacing the use of fossil fuels. NTT Anode Energy projects comply with the "Additionality" framework, so customers are able to use power generated from renewable energy via a corporate PPA.

One key fact to note is that with communications facilities located around Japan, the NTT Group accounts for approximately 1% of total electricity in Japan. The NTT Group is pushing ahead with development of renewable energy sources with the aim of generating around half of its renewable energy target, or 3.8 billion kWh/year, from its own facilities by fiscal 2030.

The NTT Group is also expanding its concept of local energy production for local consumption to stabilize the power grid by charging and discharging its constructed battery farms. There are some 7,300 NTT buildings located around Japan, housing around 4 million kWh of battery storage capacity that the NTT Group uses to maintain communications in the event of power outages. The group will develop battery farm operations around Japan by utilizing these battery farms to increase the use of renewable energy and help stabilize the power grid.

With these businesses, NTT Anode Energy will par tner with subsidiaries ENNET and NTT Smile Energy to help overcome various challenges on the way to developing a carbon-free environment for all of society.

Expanding the Use of Renewable Energy

The whole NTT Group is increasing its use of renewable energy as part of efforts to achieve the NTT Group's Environment and Energy Vision.

In 2020, the NTT Holdings head office and four facilities of NTT Laboratories made the switch to effectively 100% renewable energy. The NTT East Group has also followed suit, with office buildings, communications buildings, data centers and other facilities in eastern Japan making the shift to renewable energy; as of April 2021, 132 buildings in eastern Japan have completed their switch to effectively 100% renewable energy, including the head office building in Hatsudai. The NTT West Group is in a similar situation, with office buildings, communications buildings, data centers and other facilities in western Japan making the shift to renewable energy; as of October 2021, 58 buildings in western Japan have completed their switch to effectively 100% renewable energy.

Supplying 100% renewable energy to Seven & i Holdings stores and Operations

In a joint project with Seven & i, NTT Anode Energy began powering 40 Seven-Eleven stores and the Ario Kameari shopping center completely with renewable energy. NTT Anode Energy supplies electricity via the power grid from two solar power plants established through an off-site corporate PPA*3. The NTT Group's green power plants are used to cover any shortfall in power supply.

*3 Japan's first off-site corporate PPA scheme, which involves business operators building renewable energy power plants in locations removed from users for use exclusively by specified consumers, such as companies or municipalities, and supplying these users with electricity via the power grid over the long term.


NTT Anode Energy

Business Activity 4
Providing new services that contribute to carbon neutrality

Our commitment

Promoting the provision of new services that contribute to carbon neutrality

Our objective

Provide new services designed with the environment in mind, such as the development of services that use renewable energy, and visualization of the reduction in greenhouse gas emissions.

NTT Group's Strengths

In addition to the Green of ICT, which will curb the environmental impact of NTT Group by introducing IOWN technologies and increasing the use of renewable energy, we will also work on Green by ICT, which will contribute to reducing the environmental impact of society as a whole.

NTT DOCOMO Initiatives

In September 2021, NTT DOCOMO announced its commitment to reduce the greenhouse gas emissions arising from its business activities effectively to zero by 2030. In addition to its own business activities, DOCOMO has star ted a new ecosystem called "Caboneu™" together with its partner companies, under the slogan "Saving Our Planet With You" to help achieve carbon neutrality throughout the whole of society.

(1) Development of services that use renewable energy

The ratio of effectively 100% renewable energy (includes non-fossil fuel certificates designated as renewable energy) to total electricity consumption will be greater than the ratio of the number of 5G subscriptions to DOCOMO's total subscriptions, making 5G environmentally friendly without greenhouse gas emissions. From October 1, 2021, 5G services will be rolled out as Green 5G™. The docomo Denki™ service planned to be rolled out from March 2022 (tentative) will be available with "docomo Denki Green," anearth-friendly plan that makes extensive use of effectively 100% renewable energy (includes non-fossil fuel certificates designated as renewable energy).

(2) Provide new services designed with the environment in mind

Environmentally friendly services include providing THEO Green and the addition of SDGs/ESG as topics investment targets for the Points Investment service. A dedicated section for environmentally friendly brands and products was also opened on the d fashionR website. A range of services will be provided with the aim of achieving carbon neutrality with customers.

(3) Provide the Caboneu platform

A platform is planned where anyone can enjoy participating in activities for becoming carbon neutral, such as by visualizing contributions to reducing customer greenhouse gas emissions. Studies are being conducted for partner companies supporting the Caboneu initiative, as well as the type of content that will be provided on the platform.

NTT DATA Initiatives

NTT DATA is implementing companywide initiatives with the aim of making society carbon neutral. Examples of these initiatives include the creation of standards for measuring CO2 emissions from a software development and system development perspective, enhanced cooling efficiency and the shift to immersion cooling to help conserve energy at data centers, projects that make use of metal 3D printers, and measures for accurately measuring CO2 absorption volumes by focusing on forests as carbon sinks on a global scale. The new Green Innovation Office was also established in October 2021 to develop companywide green innovation strategies aimed at achieving carbon neutrality.

Provide the Caboneu platform

NTT DOCOMO is planning to provide the Caboneu Platform where anyone can enjoy helping to reduce greenhouse gas emissions. This platform will be provided so that anyone can enjoy participating in activities for becoming carbon neutral, such as by visualizing contributions to reducing customer greenhouse gas emissions.


Business Activity 5
Creation of innovative environment and energy technologies

Our commitment

Creation of innovative environmental energy technology for reducing global environmental impact

Our objective

Promoting the creation of innovation with nextgeneration energy technologies.

Regenerating the global environment and achieving a sustainable society

The NTT Group is creating innovative technologies aimed at addressing a range of issues related to the environment and energy such as climate change. In July 2020, we established the NTT Space Environment and Energy Laboratories for regenerating the global environment and achieving a sustainable and inclusive society. We will create technologies that will drive innovation in the field of smart energy, including next-generation energy, and for the future of the global environment.

Energy network technologies

Indoor direct-current power supply technology--a field that the NTT Group excels at--is being developed for outdoor use with the aim of achieving a high-resilience, autonomous, decentralized, and coordinated energy network to link NTT buildings and consumers in the surrounding area with direct current supply, for a flexible and efficient power supply system that is also reliable when disasters strike. Research is being conducted into technology that simulates information on energy demand, generation and storage capacities in cyberspace in an integrated manner, and applies the optimal figures to control the actual grid and achieve an ideal balance between supply and demand. Another field of study is focusing on technology for the spatial and temporal reallocation of communications traffic between multiple regions or calculat ions and other informat ion processing capabilities for more efficient use of renewable energy, which is prone to fluctuations due to weather conditions.

Sustainable systems technologies

Practical applications of technology that reduces CO2 in the atmosphere or water are being developed, covering artificial photosynthesis (based on an electrochemical approach) achieved with semiconductor technology and catalyst technology, as well as technology that maximizes the capabilities of plants and algae (based on a biological approach). The electrochemical approach utilizes materials informatics to test combinations of materials that would not have been possible to discover using traditional experimental techniques or existing concepts. The biological approach involves research using digital twins, where various cultivation environments are recreated in cyberspace to test the effects of genome editing or climate control, before applying them to the real world for additional testing.

Proactive environmental adaptation technologies

We are focusing our efforts on research topics enabling society to take a proactive stance and adapt physically to extreme weather or environmental conditions. Lighting is an example of research being conducted on weather control. We have developed advanced technologies as a means of protecting communications facilities from lightning strikes, and we are now expanding our research in this field to develop lightning control and lightning charging technologies. More specifically, this research involves high-precision forecasting of areas prone to lightning strikes, employing lightning control technology so that drones trigger lightning strikes, and then lightning charging technology to store the energy from that lightning. The future goal is to develop floating lightning energy absorption systems that operate autonomously using natural energy including that from lightning strikes to absorb energy before the lightning strikes the ground.

Next-generation energy technologies

We are involved in initiatives related to fusion energy and space-based solar power generation. Fusion energy is a power generation technology that uses nuclear fusion. NTT entered into a comprehensive partnership with the ITER International Fusion Energy Organization in May 2020, and concluded a collaboration and cooperation agreement with the National Institutes for Quantum Science and Technology, the ITER Japan Domestic Agency, in November 2020. The ITER experimental reactor is planned to begin operating from 2025, creating a miniature sun with plasma temperatures at the core reaching 150 million degrees Celsius. The immense amount of data obtained from sensors used with the experimental reactor will be transmitted via the ultra-low latency, ultra-high speed and capacity IOWN network and analyzed by AI and machine learning to instantaneously forecast the plasma conditions for real-time feedback control. Looking further ahead, we will be harnessing digital twin computing for future performance forecasting, as a way of helping to optimize operations.