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Company History

May 1963 NANKAI DENKO CORPORATION was established after the merger of four electrical construction companies, Tokushima, Nankai, Iyo and Kagawa.
Established as a business corporation (Kabushiki Kaisha). Four branches in Tokushima, Kochi, Ehime, Kagawa, and the Osaka regional office (current Osaka headquarters) were established.
December 1965 The corporate name was changed to SHIKOKU ELECTRIC CONSTRUCTION CORPORATION.
March 1966 Tokyo regional office (current Tokyo headquarters) was established.
May 1973 Okayama business office was established.
November 1979 The company shares were listed on the First Section of Tokyo Stock Exchange.
November 1989 The corporate name was changed to YONDENKO CORPORATION.
November 1992 Bunri business office was established.
November 1994 Acquisition of the shares of Kochi Create Corporation
October 1996 ACCEL-TOKUSHIMA CORPORATION was established.
February 1997 YONKO BUSINESS CORPORATION was established.
April 1997 CADEWA SERVICE CORPORATION was established.
October 1997 ACCEL-MATSUYAMA CORPORATION and Kagawa Create Corporation were established.
February 2006 Utazu Kyushoku Service Corporation was established.
November 2007 Tokushima City High School PFI Service Corporation was established.
November 2010 Tokushima Agriculture, Forestry, and Fisheries PFI Service Corporation was established.
April 2011 Ozu Kyushoku PFI Service Corporation was established.
March 2012 Tohoku business office was established.
December 2012 Nio Solar Power Generation Corporation was established.
September 2013 YONKO SOLAR CORPORATION was established.
March 2014 Kuwano Solar Power Generation Corporation was established.
May 2016 Yondenko International Private Limited was established.
August 2016 Kasaoka Kyusyoku PFI Service Corporation was established.
October 2016 Ozu School PFI Service Corporation was established.
December 2016 Matsuyama School Air Conditioner PFI Service was established.
August 2017 Seiyo City Planning Service was established.
January 2018 Tokushima Police PFI Service was established.
February 2018 Acquisition of the shares of Arimoto Oncho Corporation.