| 2001 |
- February Became an electric power retail supplier in the Tohoku region.
- April Became an electric power retail supplier in the Kyushu region.
- November Became an electric power retail supplier in the Kanto region.
|
| 2013 |
June Commercial operation of Tosa (Biomass) Power Plant started |
| 2014 |
- April Became an electric power retail supplier in the Chubu region
- December Listed stocks on Mothers(Market of the high-growth and emerging stocks) of the Tokyo Stock Exchange.
|
| 2015 |
- April, October Became an electric power retail supplier in the Kansai and the Chugoku region.
- September Established Spark Marketing Co., Ltd.
- December Listed stocks to First Section of Tokyo Stock Exchange
|
| 2016 |
- April Established Okinawa gas new power Co.
- August Established Ofunato Power Inc.
- October Establishwd Buzen New Energy Co.,Ltd.,
- October Became an electric power retail supplier in the Okinawa region.
- November Commercial operation of Saiki (Biomass) Power Plant started
|
| 2017 |
- January Established erex Singapore Pte,Ltd.
- April Became an electric power retail supplier in the Shikoku region.
- July Established Okinawa Uruma New Energy KK
|
| 2018 |
- March Became an electric power retail supplier in the Hokkaido region.
- March erex Spark Marketing Co., Ltd. merged witherex Spark Area Marketing Co., Ltd.,.
- April Became an city gas retail supplier.
|
| 2019 |
March Established Evergreen Marketing Co.,Ltd. |
| 2020 |
- January Commercial operation of Ofunato Biomass Power Plant started
- January Commercial operation of Buzen Biomass Power Plant started
- July erex Spark Marketing Co., Ltd. changed its company name to Evergreen Retailing Co., Ltd.
- October Xoom Energy Japan G.K. became a subsidiary and changed its company name to T’dash G.K.
|
| 2021 |
- July Commercial operation of Nakagusuku Biomass Power Plant started
|
| 2022 |
- February e-sell Co., Ltd. became a subsidiary
- April The stock listing market was changed to the Prime Market of Tokyo Stock Exchange
- August Shares of Itoigawa Power Plant were acquired in August
|
| 2023 |
- March erex expressed its support for the recommendations made by the Task Force on Climate-Related Financial Disclosures (TCFD)
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