| Year | Detail |
| 1885 |
Tokyo Gas Co., Ltd, founded in 1885, is the primary provider of natural gas to the main cities of Tokyo, Kanagawa, Saitama, Chiba, Ibaraki, Tochigi, and Others. |
| 2002 |
The company established Energy Advance Co. Ltd, which provides comprehensive energy services such as ESCO business, on-site power generation and heat supply, PFI ( Private Finance Initiative ) business, and local energy supply (heat and electricity supply) to buildings and factories owned by companies and local governments. |
| 2010 |
Osaka Gas Co. Ltd collaborated with the company to demonstrate the project for a smart energy network that introduced a large amount of renewable and unused energy into a distributed energy system and optimally controlled energy supply and demand through information and communications technology. |
| 2011 |
Tokyo Gas and Panasonic Corporation jointly developed a new home fuel cell, "ENE-FARM," that generates electricity by chemically reacting hydrogen extracted from city gas with oxygen in the air. The electricity generated is used in the home. |
| 2020 |
The company acquired two Wood Biomass Power Generation businesses, Fushiki Manyo Pier Biomass Power Generation LLC and Ichihara Yawata Pier Biomass Power Generation LLC, which were held by a fund managed by the Equis Group. |
| 2021 |
The company established Tokyo Gas Nomura Real Estate Energy Co. Ltd, which supplies heat and electricity through an energy plant constructed in the Shibaura 1-chrome Project, thereby improving energy efficiency in the entire area, reducing environmental impact, and strengthening disaster prevention capabilities. |
| 2021 |
The company established a joint venture with PTT & TGES Optec Co., Ltd. and Siam Management Holdings Company Limited, a wholly owned subsidiary of PTT Public Company Limited, to provide advanced on-site energy services that combine LNG tanker supply with the introduction of gas cogeneration systems. |
| 2023 |
The company signed a joint development agreement with H2U Technologies, Inc., a U.S. startup company with a unique and highly efficient catalyst discovery technology to reduce the cost of water electrolysis equipment. |
| 2024 |
Tokyo Gas signed a collaboration agreement with the UK's James Fisher & Sons to provide construction support and operation and maintenance (O&M) services for offshore wind power in Japan. |
| 2025 |
Taito Ward and Tokyo Gas signed a partnership agreement to realize a zero-carbon city that aims to reduce greenhouse gas emissions to virtually zero by 2050. |