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J-POWER Transmission Network Co.,Ltd.

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Corporate brand

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Japanese power transmission operator and wholly owned subsidiary of Electric Power Development Co., Ltd. (J-POWER).

Last updated September 16, 2026

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Overview

J-POWER Transmission Network Co.,Ltd. (communication name: J-POWER送変電) is a Japanese power transmission company established on 1 April 2020, headquartered in Ginza, Chuo-ku, Tokyo. It is wholly owned by Electric Power Development Co., Ltd. (J-POWER) and its main business is power transmission. It owns transmission lines with a total route length of approximately 2,410 km, five substations, four AC/DC converter stations and one frequency converter station, contributing to the wide-area operation of Japan's power grid.

History

J-POWER Transmission Network Co.,Ltd. was established on 1 April 2020. It is headquartered in Ginza 6-15-1, Chuo-ku, Tokyo, and is 100% owned by Electric Power Development Co., Ltd. (J-POWER). Its main business is power transmission. The company owns transmission lines with a total route length of approximately 2,410 km, five substations, four AC/DC converter stations and one frequency converter station, including inter-regional interconnection facilities linking Honshu with Hokkaido, Shikoku and Kyushu. Its Sakuma Frequency Converter Station, located in Shizuoka Prefecture, was the world's first commercial frequency conversion facility for the electric power business, enabling power interchange between eastern Japan's 50 Hz and western Japan's 60 Hz systems (maximum capacity 300,000 kW); in June 2016 the Organization for Cross-regional Coordination of Transmission Operators formulated a wide-area grid development plan for the Tokyo-Chubu interconnection facility, and a plan to increase capacity from 300,000 kW to 600,000 kW is underway. The Honshi Interconnection Line is a 500,000-volt transmission line attached to the Honshu-Shikoku bridges crossing the Seto Inland Sea.

Products and positioning

Contributing to the wide-area operation of Japan's entire power grid through transmission and transformation facilities.

Product categories. Power transmission services · Inter-regional interconnection facilities · Frequency conversion facilities

Sources5 sources

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