SINANEN HOLDINGS Group became a holding company on October 1, 2015. See the website of SINANEN HOLDINGS for the history of the Group as a whole.

October 2015	Changed company name to SINANEN CO., LTD. as SINANEN Group became a holding company
January 2016	Acquired all shares of Nippon Solar Electric Power Co., Ltd.
July 2016	Completed construction of Ten-ei Village Solar Park
December 2016	Withdrew from solid fuel business
June 2017	Took over a part of the business of SINANEN FACILITIES CO., LTD.
April 2018	Established PV Service Department to carry out solar power-related business
June 2018	Took over a part of the business of Solar Power Support Center Co., Ltd.
January 2019	Moved the head office to 3-5-27 Mita, Minato-ku, Tokyo
March 2019	Founded SINANEN KOREA CO.,LTD.
February 2020	Founded Sinagy Revo Co., Ltd.