Shimoina Substation is a 500kV substation located in Shimoina, Nagano, Japan.

The Shimoina Substation project’s construction has begun in 2020. The works are expected to be commissioned in 2024.


Shimoina Substation project, which is a new substation, will be operated by Chubu Electric Power.

The designed voltage level of the substation is 500/154kV and the operating voltage level is 500/154kV.

The step-in voltage of the project is 500kV and the step-out voltage is 154kV. Upon completion, the substation will have a capacity of 600MVA.

Shimoina Substation project development status

The development of the Shimoina Substation project was approved by The Energy Conservation Center in 2020. The project is expected to be commissioned in 2024.

About Chubu Electric Power

Chubu Electric Power Co Inc (Chubu) is an energy utility. It generates and procures electricity and offers electric network related services. The company produces electricity using the hydro, thermal, nuclear and renewable sources. Chubu has interests in upstream and midstream energy fields, and electricity generation projects in overseas. It also offers comprehensive energy services in gas and power fields. The company has regional offices in Nagoya, Mie, Gifu, Nagano, Okazaki, Tokyo and Shizuoka in Japan; and overseas offices in the US, the UK and Qatar. Chubu is headquartered in Nagoya, Aichi, Japan.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.