| 1972 | Founded as Chiyoda-Dames & Moore Co., Ltd. by the parent companies Chiyoda Corporation of Japan and Dames & Moore of the United States Began environmental assessment services for the construction of petroleum storage facilities, etc. |
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| 1974 | Began contracted research and studies on waste and recycling |
| 1976 | Began contracted soil, groundwater, and substructure studies associated with overseas plant construction |
| 1977 | Began contracted diffusion simulations and other services in marine areas Began contracted services concerning chemical substances and health |
| 1978 | Began undertaking Official Development Assistance (ODA) projects Began contracted research and studies on fisheries resources |
| 1979 | Began contracted terrestrial ecosystem studies for power plant sites |
| 1982 | Began environmental due diligence services Began soil and groundwater remediation services Began contracted wind studies for wind power generation |
| 1984 | Began contracted research and studies on renewable energy |
| 1986 | Began services relating to global warming countermeasures |
| 1988 | National wind map preparation services |
| 1993 | Began environmental adviser services for international investment and financing institutions |
| 1999 | Formed a technical partnership with URS Corporation of the United States (currently AECOM) |
| 2001 | Changed company name to E&E Solutions Inc. Became a consolidated subsidiary of Dowa Mining Co., Ltd. (currently DOWA ECO-SYSTEM CO., LTD.) |
| 2003 | Began services supporting responses to global warming, including studies of the Clean Development Mechanism (CDM), Joint Implementation (JI), and others Began environmental adviser services for private banks based on the Equator Principles Received designation as a Designated Investigation Institution based on the Soil Contamination Countermeasures Act (Ministry of the Environment) |
| 2006 | Moved head office to the UDX Building |
| 2010 | Began environmental and social consideration assessment services relating to renewable energy Began environmental and social consideration assessment services for geothermal power generation projects |
| 2012 | Began due diligence services for solar power projects in line with the Feed-in Tariff scheme for renewable energy Began radiation monitoring services for local governments Began environmental assessments and other services associated with offshore wind power generation Received Eco-Action 21 certification and registration |
| 2014 | Began Doppler lidar-based wind power observation services for offshore wind power |
| 2015 | Entered into a partnership with Ramboll Environment of Denmark (currently Ramboll) Established the Akita Ocean Environment Association (a partnership with two companies in Akita Prefecture) |
| 2018 | Business alliance with Japan Credit Rating Agency, Ltd. (JCR) (relating to sustainable finance) |
| 2020 | Business alliance with Xodus of the United Kingdom (relating to offshore wind power) Business alliance with RPS of the United Kingdom (relating to offshore wind power) |
