| 1984-05 |
Established West Japan Bell Trading Co., Ltd. in Yokogawa-cho, Nishi-ku, Hiroshima City |
| 1985-04 |
Changed trade name from West Japan Bell Trading Co., Ltd. to Seibu House Industry Co., Ltd. |
| 1989-06 |
Changed trade name from Seibu House Industry Co., Ltd. to West Corporation |
| 1991-02 |
Relocated headquarters to Kusunoki-cho, Nishi-ku, Hiroshima City (current headquarters building completed) |
| 1995-01 |
Introduced after-sales service cars and started regular inspections |
| 1996-12 |
Relocated Tokyo branch to Nishi-Shinjuku, Shinjuku-ku, Tokyo, and renamed to Tokyo headquarters |
| 2002-01 |
Completed roof tile renovation work on Hiroshima Castle keep |
| 2004-06 |
Listed on JASDAQ Securities Exchange |
| 2005-06 |
Opened first store (Hiroshima Yagi) through a business partnership with Yamada Denki Co., Ltd. |
| 2006 |
Solar Power Generation Business |
| 2006-03 |
Established West Holdings Co., Ltd. in conjunction with transition to a holding company structure. |
| 2006-03-01 |
Founded |
| 2006-03-01 |
March 1, 2006 (Founded October 1981) |
| 2007 |
Start of Sales of Residential Solar Power Systems |
| 2010-06 |
Launched sun exposure compensation service through partnership with a major insurance company. |
| 2011-08 |
Installed solar power system and battery storage at a primary school in Cambodia. |
| 2012-03 |
Decided on the first megasolar project in Higashimatsu Village, Fukuoka Prefecture. |
| 2013 |
Initiation of Smart City Concept with Akitakata City |
| 2013 |
Construction of Japan's First Floating Water-Based Mega Solar in Saitama Prefecture Okegawa City |
| 2013-06 |
Constructed Japan's first floating megasolar installation in Oekawa City, Saitama Prefecture. |
| 2013-06 |
Establishment of West O&M Corporation |
| 2014 |
Total Energy Solution Business |
| 2014 |
Regional Revitalization Using Energy Solutions |
| 2014 |
Promotion of Energy Conservation Using New Power and West Esco |
| 2014-02 |
West Megasolar in Yamaguchi City, Yamaguchi Prefecture, became the first in Japan to obtain TÜV SÜD certification. |
| 2014-09 |
Established West Electric Power Co., Ltd. |
| 2015-10 |
Registered as a retail electricity supplier. |
| 2016-08 |
Established West International Thailand. |
| 2019-07 |
Launched the 'CoCoLo Project' utilizing the J-Credit system. |
| 2019-09 |
Opened 'Drone School Akikogata School' at West New Zealand Village Solar Park. |
| 2020-02 |
West Group's megasolar achieved the top 'Green1(F)' rating in the Green Finance Framework evaluation by the Japan Rating Research Institute. |
| 2020-09 |
Started supplying renewable electricity from newly established non-FIT solar power plants to Osaka Gas. |
| 2020-11 |
West Energy Solution opened a joint research course 'Solar Sharing' with Hiroshima University. |
| 2021-03 |
Signed a business partnership agreement with China Power Co., Ltd. concerning green power supply. |
| 2021-03 |
Signed the 'SDGs Comprehensive Cooperation Agreement' with Bizen City, Okayama Prefecture. |
| 2021-04 |
Formulated West Group Carbon Neutral Vision 2025. |
| 2022-06 |
Moved Tokyo headquarters to Marunouchi, Chiyoda-ku, and established the Energy Solutions Metropolitan Headquarters in Nihonbashi, Chuo-ku. |
| 2022-09 |
Launched the 'West Sustainable Standard', a common specification product delivering peace of mind and safety to customers. |
| 2023-06 |
Establishment of West Energy Corporation |
