Tokyogasgroup csr report

Contribution to the Environment

Action at the City Gas Production and Supply Stages


Action at the City Gas Production and Supply Stages

Natural gas drilled overseas is liquefied and transported by tanker in the form of LNG at a temperature of -162 °C. Tokyo Gas produces city gas at its terminals in Negishi, Sodegaura, Ohgishima, and Hitachi for supply via a network incorporating mutual backup arrangements.

Little energy is used in the process of making city gas from LNG, and energy efficiency at the production stage is at least 99%. As city gas is supplied directly to where it is used in gas form, energy loss during production and supply is negligible.

We are making even further efforts to conserve energy by, for example, using the cold energy of LNG.

Ohgishima LNG Terminal
Ohgishima LNG Terminal

High Efficiency of the City Gas System


High Efficiency of the City Gas System
DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.

Utilization of LNG Cold Energy

One kilogram of -162 °C LNG has sufficient cold energy to freeze 2.5 kg of water. We are using this cold energy at various temperature levels for applications including power generation, cold storage, and the production of dry ice. In all, 2,678 thousand tons was used in this way in fiscal 2016. At the Negishi LNG Terminal, about 38% of the electricity used is generated from cold energy. In fiscal 2016, 32,134 MWh was generated from cold energy, resulting in a CO2 emission reduction of about 22,000 tons.

Cold Energy Use in FY2016
Purpose of use LNG used for cold energy (1,000 tons)
Supplied to subsidiaries and affiliates 820
Electricity generated using cold energy 785
BOG* processing 1,073
Total 2,678
Boil-off gas. This is gas generated by the vaporization of LNG in tanks caused by heat leaks from the atmosphere.
DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.

Action to Reduce Methane Emissions

Methane accounts for less than 1% of Tokyo Gas Group’s greenhouse gas emissions.
As these emissions largely occur when city gas is produced and work is carried out on pipelines, Tokyo Gas Group is working to further reduce methane emissions by such means as reducing the amount of sampling gas used for product gas analysis, preventing venting when calorific value adjustment systems are shut down, scheduling pressure reductions to reduce emission into the atmosphere when work is carried out on pipelines, and developing gas adsorption recovery systems.
DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.