May 1979 Established Hanwa Nessui Ind. Co., Ltd., origin of TESS Engineering
January 1992 Changed name to TESS Engineering Co., Ltd.
November 1999 Opened 24 Hours Operation Monitoring System
July 2000 Acquired ISO14001 - Environmental Management System
February 2006 Gas Engine driven 70 MW Co-Generation Power Plant
Started O & M total service business
February 2007 Registered in "FY2006 Voluntary Participating Domestic Discharge Amount Trading System" promoted by Ministry of Environment(including 2007)
December 2008 Participated in Trial Discharge Amount Trading Scheme
May 2009 Registered as company granted "Green Power Certificate" - Renewable Energy Certificate
July 2009 Masayuki Ishiwaki assumed Chairman, and Hideo Ishiwaki assumed President of the company
Established TESS Techno Service Co., Ltd.
Selected as trustee for "FY2009 Domestic Credit System - Soft Supporting Business" promoted by METI (including 2010)
February 2010 Applied "Power Producer and Supplier" to METI (Ministry of Economy, Trade and Industry)
2011 Contributed for construction of captive power plants at various factories and offices to cover the consequent power shortage by Great East Japan Earthquake
2012 Executed many EPC contracts on solar and biomass power plants as FIT (Feed-in Tariff System) enacted in Japan
March 2012 Established Intelligent Solar Systems Co., Ltd.
March 2013 Established Prime Solar LLC
June 2013 Strated operation of "TESS Tokushima-Anan Solar Power Station" as own power business
Developing own power plants throughout Japan
April 2014 Established TESS Asset Management LLC
June 2014 Established T&M Solar LLC
December 2014 Acquired ISO9001 - Quality Management System
Acquired ISO27001 - Information Security Management System
November 2015 Registered as electricity retailer
April 2017 Accumulated construction job records of Solar Power Stations based on FIT (Feed-in Tariff) exceed more than 430MW
July 2017 Hideo Ishiwaki assumed Representative Director and Chairman, and Toshihiro Takasaki assumed Representative Director and President.
April 2018 Shifted the organization to holding company led by TESS Holdings Co., Ltd. as wholly-owning parent company
Our Chairperson, Hideo Ishiwaki retired TESS Engineering Co., Ltd. and newly assumed as President of TESS Holdings Co., Ltd.