TOKYO GAS TOP > CSR Report >  Glossary
Tokyo Gas Group CSR Report 2016



Asphalt concrete lump

Lump of asphalt and concrete generated during work such as road resurfacing.


Ballast water

Water pumped aboard a ship to improve its balance when it is sailing with little load and could be unstable. The seawater at ports of call is often used as ballast water, and the aquatic organisms it contains may become invasive and adversely affect ecosystems when discharged in other locations.


Abbreviation for Business Continuity Plan.

A plan made by a company in preparation for an emergency, such as a natural disaster, major fire, or terrorist attack. Business continuity plans describe actions to be taken during normal conditions, and the means, methods, and other arrangements to be implemented in emergencies to ensure business continuity, minimize loss and damage to operating assets, and maintain or immediately restore core operations.


Abbreviation for Building-Housing Energy-efficiency Labeling System.

A system for assessment of new and existing buildings' energy-saving performance by third-party evaluation agencies.


Organic matter other than fossil resources derived from renewable sources such as waste wood and kitchen waste.



Abbreviation for Comprehensive Assessment System for Built Environment Efficiency.

Buildings are assessed on the basis of their environmental performance and assigned a rating on a five-tier scale.



The country or region in which is located the final port of discharge for which LNG is bound. LNG contracts have traditionally contained "destination clauses" by which sellers restrict where LNG can be landed.


In a business context, promoting diversity means respecting and accepting all people regardless of gender, age, disability, ethnicity, values, and other attributes by creating an inclusive work environment for all. Diversity can contribute to sustainable business growth and development.


Energy services

The bundle of services efficiently delivered by energy service providers to solve customers' various energy-related problems. They include provision of heat, electricity, and water generated by gas cogeneration systems, boilers, air conditioners, water treatment plants, and other facilities.

Environmental management system (EMS)

Environmental management is the establishment of policies and targets by a business or other entity to guide its independent action to protect the environment, and its pursuit of these policies and targets. It encompasses the systems, procedures, and other arrangements put in place for doing so at its factories and offices.

Excavated soil

Soil and waste asphalt generated by work such as the laying of gas pipelines under roads.


Fuel cell

A system that generates electricity by electrochemically reacting oxygen in the air with hydrogen extracted from a source such as the natural gas used to make city gas.


Gas cogeneration system

A distributed energy system that simultaneously generates electricity by various means (engine, turbine, fuel cell, etc.) burning natural gas or other fuels, and uses the waste heat produced to generate steam or hot water. Systems of this kind are very environmentally friendly and also help diversify power sources and conserve electricity.

Gas pressure differential power generation

The generation of electricity by utilizing the differential pressure of city gas flowing through gas pipelines to drive a turbine. Systems of this kind conserve energy as they consume no gas. Using the cold energy produced at the same time as electricity generation yields further energy savings.

Gas turbine combined cycle

A means of achieving high electricity generating efficiency through a combination of two methods. First, a fuel such as natural gas is combusted to drive a gas turbine. The heat of the exhaust gas from the turbine is then recycled by using it to convert water into steam, which is recovered to drive a steam turbine.


Henry Hub (U.S. natural gas market) price

The name for the benchmark price of natural gas in the U.S., derived from the Henry Hub distribution node in Louisiana in the U.S. South. The price of natural gas bought and sold is used as the index (benchmark) value of the futures price on the New York Mercantile Exchange (NYMEX).

High-pressure gas pipeline

Also known as a trunk line. A gas pipeline with a gas pressure of at least 1 MPa and a typical diameter of 65-75 cm that is used to transport city gas from an LNG terminal.

Gas is supplied from pipelines of this kind via governor stations to medium-pressure pipelines, and then by district pressure regulators to the low-pressure pipelines that deliver city gas to the home.

Human rights due diligence

The process of identifying and assessing the impacts on human rights of business activities as a whole, and implementing measures to prevent and mitigate these impacts.


ISO 14001

The international standard for EMS developed by the International Organization for Standardization (ISO). It aims to align management with mitigation of environmental risk and contribution to the environment, and is further intended to encourage continuous improvements in EMS standards.


J-Credit Scheme

A program by which reductions and sequestrations of emissions of greenhouse gases such as CO2 achieved by such means as installing energy-saving equipment and planting trees are certified by the government as "credits." These credits can be used to offset other carbon emissions and attain the targets set by commitments for achieving a low carbon society.



Abbreviation for Life Cycle Assessment.

A method of assessing how a product affects the environment at every stage of its life, from production to use and disposal.


An initialism used to refer collectively to lesbian, gay, bisexual, and transgender people.

LNG (Liquefied natural gas)

A gas consisting principally of methane (CH4) that has been liquefied by cooling to around -160°C. In Japan, it is used primarily as fuel for power stations and as city gas. It is a clean energy source that produces virtually no SOx or particulate emissions.

LNG tanker truck

Tank truck used to transport LNG to areas where gas pipelines have not been built.

LNG value chain

The series of business activities that add value at each stage from procurement of raw materials to delivery of products and services to the customer.

Tokyo Gas Group considers the "LNG value chain" to be the chain of all business activities extending from the procurement of LNG to the transportation, production and supply of city gas, power generation, and delivery of energy solutions.


Participating interest

Interest a trading company or other entity obtains when it finances (through a loan or investment) a development project in a resource-producing country, giving it the right to acquire resources produced as a result that are proportional to the size of its financial stake.

Polyethylene pipe, polyethylene (PE) pipe

Gas pipe made from highly corrosion and quake resistant polyethylene that is used for buried sections of pipeline. Tokyo Gas is increasing its use of polyethylene pipes for the low-pressure pipelines that make up 90% of its network in order to minimize damage from earthquakes.


Regenerative burner system

An energy-saving system that combines high combustion efficiency with low NOx emissions. Two burners are alternately fired and the heat of the exhaust gas when one burner is fired is recovered by a heat reservoir to preheat the air for the next combustion, resulting in a 30-50% reduction in energy consumption and CO2 emissions.

Renewable energy

Inexhaustible energy sources such as sunlight, solar heat, hydropower, wind power, biomass, and geothermal energy. Once used, they can be replenished comparatively quickly.



Abbreviation for Sustainable Development Goals.

The SDGs are a set of international goals for building a better world that establish priority issues on a global scale and provide a vision of the world in 2030. They were adopted at the United Nations Sustainable Development Summit held at the United Nations Headquarters in New York in 2015, which was attended by over 150 world leaders.

Shale gas

Methane gas trapped in shale, thin, flakey rock formations formed from ancient mud deposits. Shale gas resources are abundant, and are expected to have a major impact on world energy production and consumption.

Supply chain management

Activities undertaken to promote CSR along the length of the supply chains by which a business procures raw materials and delivers products and services to its customers. Suppliers are required to meet CSR objectives in areas such as the environment, working conditions, and human rights, as well as requirements regarding specifications, prices, and delivery times.



Abbreviation for Tokyogas Eco System.

Tokyo Gas water heating system for the home that uses heated water from a single heat source to provide hot water for baths, space heating, underfloor heating, and bathroom heating and drying.


Unconventional gas

Gas produced from sources other than ordinary gas fields. In addition to tight sand gas, coalbed methane, biomass gas, and shale gas currently being produced commercially, unconventional gas also includes methane hydrate, deep earth gas, and other gas sources which are expected to become commercially viable energy sources in the future.



Abbreviation for Net Zero Energy Building.

A building designed to achieve a net zero annual balance between primary energy consumption and generation by combining the use of renewable energy sources with major energy-saving features.

Page Top