Notice Regarding Unusual Noise and Electrical Accident at Tosoh’s Nanyo Complex

Tokyo, Japan—Tosoh Corporation reports that on Friday April 6, 2018 at 10:35 an accident happened at its Nanyo Complex, Cogeneration Plant, Special High-voltage Substation, Tower No. 3. During planned work at the substation, a ground fault occurred, leading to a power outage at the complex and the resulting emergency shutdown of several plants at the complex. These emergency shutdowns happened without trouble but caused unusual noises that worried the local community. Tosoh Corporation hence conveys its deepest apologies for causing alarm to the local community and other stakeholders in relation to the unusual noise and electrical accident. Please find below a summary of findings.

Location of occurrence:     Nanyo Complex, Electricity generation department, No. 3 Tower (Special High-voltage Substation)
4560, Kasei-cho, Shunan City, Yamaguchi Prefecture

Date/Time of occurrence:     10:35 AM, Friday, April 6, 2018

Nature of occurrence: A ground fault occurred during construction work on Nanyo’s in-house power plant, leading to a power outage.

At the time of the ground fault, one person was injured through electrocution.

As the power plant engaged in emergency shutdown, safety systems were triggered which released high-pressure steam and this caused unusual sounds but this is part of the procedure and the power plant shut down normally.

Manufacturing facilities powered by the in-house power plant were also safely shut down.

Cause: Under investigation



1 worker (of a partner company) injured from electrical shock


Under investigation


No leakage of hazardous materials, etc.
No impact on the environment

Impact on Production/
Under investigation



Tosoh is the parent of the Tosoh Group, which comprises over 100 companies worldwide and a multiethnic workforce of over 12,000 people and generated net sales of ¥753.7 billion (US$6.3 billion at the average rate of ¥120.15 to the US dollar) in fiscal 2016, ended March 31, 2016.


Tosoh is one of the largest chlor-alkali manufacturers in Asia. The company supplies the plastic resins and an array of the basic chemicals that support modern life. Tosoh’s petrochemical operations supply ethylene, polyethylene, and functional polymers, while its advanced materials business serves the global semiconductor, display, and solar industries. Tosoh has also pioneered sophisticated bioscience systems that are used for the monitoring of life-threatening diseases. In addition, Tosoh demonstrates its commitment to a sustainable future in part by manufacturing a variety of eco-products.

Stock Exchange Ticker Symbol: 4042


This document may contain forward-looking statements, including, without limitation, statements concerning product development, objectives, goals, and commercial introductions, which involve certain risks and uncertainties. Forward-looking statements are identified through the use of the word anticipates and other words of similar meaning. Actual results may differ significantly from the results expressed in forward-looking statements.


For more information, please contact


Jeff Markley
International Corporate Development
Tosoh Corporation
Tel: +81 3 5427 5118
Fax: +81 3 5427 5198