TOPICSHEPCO Minami-Hayakita Substation【Redox Flow Battery】

Operation of one of the world's
largest storage battery systems
has been started
The operation of a large-scalelarge scale storage battery system at Minami-Hayakita
Minami Hayakita
Substation, which was jointly developed by Hokkaido Electric Power Co.,
Inc. (HEPCO) and Sumitomo Electric, was initiated in December 2015.
With a rated output of 15,000 kW and storage capacity of 60,000 kWh, it
is one of the largest redox flow battery systems in the world, andattracting global attention.
Building housing the storage battery systemAiming for a new style of electricity that is friendly to everyone
in all stages of power generation, transmission,distribution, storage and use
We aim to develop a society with new power and energy infrastructure through the smart energy
system proposed by the Sumitomo Electric Group, and redox flow battery is a key technology andproduct to the society. In 2012, a large-scale redox flow battery with storage capacity of 5,000
kWh was installed in Yokohama Works of Sumitomo Electric. More than 5,000 people from Japanand other countries have visited the facility since then and highly valued the capabilities of thebattery such as the safety and long service life along with applicability to various uses related tothe improvement of power stability and efficiency. Meanwhile, in this demonstration test in
Hokkaido, a redox battery system with storage capacity of 60,000 kWh, which is 12 times higher
than that of the system in Yokohama Works, has been operated as one of the largest power
storage systems in the world. Hokkaido is a prefecture where a large amount of renewable energy
such as wind power and photovoltaic power has been introduced, and there is demand forlarge-scale battery to adjust electric power storage. In the demonstration project, we will work
together with HEPCO to obtain results that can earn a high level of trust from customers.
I belong to the Energy System Division, which is in charge of the commercialization of theKikaku Tokumaru

technologies and products created in R&D units. I would like to use the project as a foothold for

Deputy General Manager,
Energy System Division
Executive Officer

the marketing of large-scale power storage systems not only in Japan but also foreign marketsincluding the US and Europe. It is planned to add container-type and other compact types ofstorage battery to the product lineup in the future to enhance the presence of Sumitomo Electric.
We will continue to offer our original technologies and products for the smart energy systemcovering all power stages of power generation, transmission, distribution, storage and use.

35 CSR Report 2016

Basis for Management
Business Outline
Governance

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Chitose CityoSekish
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New Chitose AirportHEPCO
Minami-Hayakita
Substation

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Main aLine

Supply Chain

We will develop a sustainable futurewith redox flow battery

Products & Services

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Monitoring room

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Group's CSR Activities

To Sapporo453

To launch this project, I served as the site manager of the battery facility installation work andengaged in all stages from the start of construction to the operation of the system. This system isflow battery. As an electrical facility, the system characteristically requires strict safety
management. During the construction period of approximately 17 months, a total of about 200
people including suppliers worked on site, and the management of their daily and weekly work
schedules, as well as sharing of information among them, was conducted in a meticulous manner.

Human Resources

based on the expertise and experience that Sumitomo Electric has accumulated on the redox

Then, in December 2015, the system was successfully completed, and the operation was begun
for daily duties with renewed determination.
This demonstration project aims to evaluate the performance of the redox flow battery incooperation with HEPCO and clarify its superiority in performance and price over other types ofEnvironmentalPreservationin the same month. Considering that it is only the start of the main part, I am continuously workingbattery.
energy, such as the supply demand balance and surplus electricity, and establish an environment

Assistant General Manager,
System Engineering Group,
Energy Storage Engineering
Department,
Energy System Division

where renewable energy can be used more actively. We regard the demonstration test in theMinami-Hayakita Substation as an important step toward the sustainable future in which the redox
flow battery plays a key role worldwide.

CSR Report 2016Social Contribution

By disseminating redox flow batteries, we would like to help solve the problems in renewable

Syuji Hayashi

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