High Voltage Cable

We are capable of providing comprehensive services from production to installation of High Voltage Cable, contributing to power transmission infrastructure development in Japan and throughout the world. Likewise in the field of submarine cables, since having installed the world's longest submarine cable at that time of 21km in 1921, we have to date manufactured and installed over 6,000km* of submarine cables.
*As of Aug, 2020

High Voltage XLPE Cable is now dominant in new transmission lines for both land and submarine applications. Utilizing the broad base in technological and product development knowhow accumulated from the first pioneering steps in this field way back in the 1960's, we have been leading extra High Voltage XLPE Cable development including DC application. In 2000, we commissioned the world's first long distance AC High Voltage XLPE Cable system (500kV) and in 2019 we successfully put into commercial operation the world's first DC High Voltage XLPE Cable system (400kV) in UK-Belgium Link (NEMO Linke Project).


The history of Sumitomo Electric dates back more than 120 years. Back then, Japan was still heavily dependent on imports for cables and almost all other expensive items. To solve the country’s extremely severe situation, and contribute to realizing a rich, dream-inspiring future, we launched an electric wire business in 1897. Afterwards, we succeeded in the first domestic production of high-voltage underground cables and the production and installation of the world's longest submarine cables. We have thus played an important role in supporting the development of Japanese industries.
This long history has been underpinned by the Sumitomo Spirit, which has been passed down from generation to generation for more than 400 years. Sumitomo’s history, the origin of Sumitomo Electric, began with copper refining business. Since then, for more than 400 years, we have always strived to conduct business in harmony with society. Placing our basis on the Sumitomo Spirit, we will contribute to the development of Japan and the rest of the world, with our belief in the great potential of innovation.

History of Sumitomo Electric


October4, 2021
Sumitomo Electric completes the replacement of 69kV AC XLPE submarine cable system for Southeast Alaska Power Agency in Alaska, USA.
September22, 2021
Sumitomo Electric and Siemens Energy secure contract for 500 MW Greenlink interconnector between UK and Ireland to enhance exchange capacity of renewable energy.
May14, 2021
Sumitomo Electric Wins Offshore Wind Cable Contract with UK’s Gwynt y Môr OFTO
March17, 2021
Sumitomo Electric and Siemens Energy commission first VSC HVDC link improving power quality in India
February9, 2021
Sumitomo Electric contracts with 50Hertz, an Elia Group company, to replace the 400kV Germany-Denmark Interconnector land cable on the German side. The new cable will be reliable & environmentally friendly and with innovative technology.


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