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CSR Charter ⅡHarmonizing with the Environment and Contributing to Realizing a Sustainable Society

Developing Environmental Technologies

Aspects Determined as Materiality

  • Emissions

Principle and Outline

Technology forms the foundations for the corporate competitiveness of the Daigas Group, and R&D is therefore considered one of the most important corporate strategies for differentiation. With its environmental friendliness and secured procurement and supply, natural gas is expected to play an important role in creating a low-carbon society. To encourage greater use of natural gas and the utilization of renewable energies, the Daigas Group has been actively engaged in R&D on smart energy networks and household fuel cells as well as R&D and practical application efforts for a variety of new technologies that will lead to greater customer convenience and energy-saving behavior.

Efforts to Popularize Independent Dispersed Energy

Smart Energy House

Osaka Gas is working on the development of the Smart Energy House, which is designed to offer comfortable and environmentally friendly living to people by achieving “smart” management of electricity and heat when they are created, stored and consumed. The Smart Energy House runs on three batteries—a residential fuel cell, a solar power system and a storage battery—and uses IT to achieve the goal.

Osaka Gas and Sekisui House Ltd. conducted a living experiment of the Smart Energy House for three years from February 2011. The results of the experiment break down into three main points, which were released after technological studies were conducted to put them to practical use in the future.

  1. The experiment conducted under actual living conditions achieved a 103% reduction in CO2 emissions*, an 82% cut in energy consumption and savings of ¥310,000 in utility expenses and fuel costs for the vehicle.
  2. The experiment confirmed the functionality of our Home Energy Management System (HEMS), which is said to be effective in ensuring both comfort for residents and long-term energy savings.
  3. The experiment also demonstrated that automatic control systems set up in housing facilities, such as electrically-operated shutters and electric curtains, are effective in increasing convenience and comfort for residents.

Osaka Gas developed “a Smart Energy House Storage System,” a small-size and lightweight storage system with a storage capacity of 3.2 kWh. The product, capable of charging electricity generated by Ene-Farm type S, a home-use fuel cell developed by Osaka Gas, was developed based on the utility's know-how on enabling optimal control of the three batteries and a storage system developed by KYOCERA Corp. Osaka Gas began selling the new storage system in April 2017.

* Calculation of CO2 emission reduction
In addition to CO2 emission reduction to net zero, CO2 emissions are expected to be further decreased by another 3% through the use of the three batteries and by exporting electricity generated by the solar cell back to the grid.

Smart Energy House Conceptual Diagram

Smart Energy House Conceptual Diagram

Smart Energy Network

A Smart Energy Network is a next-generation energy system that combines a gas cogeneration system, renewable energy, and information and communication technology (ICT), enabling energy interchange as well as integrated control of dispersed sources of power. The SEN provides three new values: 1) promotion of further energy saving and CO2 emission reduction, 2) enhancement of energy security, and 3) acceleration of the introduction of renewable sources of energy. In FY2011 to 2013, Osaka Gas participated jointly with Tokyo Gas Co., Ltd. in the “Dispersed Energy Compound Optimization Demonstration Project” of the Ministry of Economy, Trade and Industry (METI). Osaka Gas successfully completed the demonstration, with cooperation from nine customers.

We have also developed a smart energy network in an area earmarked for redevelopment, partially owned by the Daigas Group, in the Iwasaki district of Nishi Ward in Osaka City. The network enables the accommodation of electricity among connected facilities in the area, including a shopping mall, a stadium and buildings of the Daigas Group. This network went into operation in July 2013.

Smart Energy Network Conceptual Diagram

Smart Energy Network Conceptual Diagram

Demonstration of peer-to-peer power transactions among residents in NEXT21 begins

Osaka Gas Co., Ltd. began a peer-to-peer power transaction demonstration among residents at the Osaka Gas experimental residential complex “NEXT21”*1 in March 2019. Currently, surplus power generated by distributed energy systems is supposed to be sold to electricity retailers. In the future, customers who own distributed energy systems centered on renewable energy power generation may be allowed to sell and buy generated power without restriction. For the effective management of these transactions, blockchain technology*2 is expected to be used.

Osaka Gas has begun a demonstration using the actual living environments of residents in the experimental residential complex to verify the effectiveness of blockchain technology for peer-to-peer power trading. If peer-to-peer transactions can be achieved, new value can be provided according to customers’ needs, such as directly connecting buyers and sellers who choose power with low environmental impact.

Furthermore, in this demonstration, an area (microgrid) is built where VSG control*3 is adopted for a small distributed power generation system in preparation for a blackout of the power grid, thereby continuing the power supply. The project will also verify whether interchange power records among customers can be managed using blockchain technology during a power outage as they would under normal conditions.

*1 “NEXT 21”
“NEXT 21” was constructed in October 1993 by Osaka Gas to propose an ideal neo-futuristic urban multiple-unit housing under the concept of “Achieving both comfortable and convenient life and energy-saving / environmental preservation.” Demonstration experiments were conducted in four phases over the past 25 years, with Osaka Gas’s employees and their families residing in the housing. Each phase was designed to meet themes suited to the times.
Demonstrative experiments were conducted on a variety of themes, including energy saving for the entire building, its CO2 reductions, greenery restoration and environmental symbiosis in urban areas, ideal forms of residence that reflect diverse lifestyles, and product development. Also, many proposals and presentations that may lead to ideal multiple-unit housing in the future have been made at a time when the liberalization of the energy market has advanced. Some of the proposals have been commercialized.
*2 Blockchain technology
A technology that allows the management of transaction records on distributed servers. It is highly resistant to falsifications and failures, and also holds promise for achieving automated transactions.
*3 VSG control
VSG stands for Virtual Synchronous Generator. In this demonstration, this virtual technology is used to simultaneously operate multiple distributed power generation systems in the microgrid. With VSGs, there is no need to assign a power generator as the control tower for the entire microgrid. The risk of the entire microgrid losing power is therefore lower when a single “control tower” power generator goes down.

Contributing to a Hydrogen Society

Development of hydrogen generators and the establishment of hydrogen filling stations





Kamitoba Hydrogen Station

Kamitoba Hydrogen Station

Osaka Gas has developed a compact on-site hydrogen generator, “HYSERVE-300”, which produces hydrogen from natural gas with an output capacity of 300 m³ N/h. The move has been in response to increasing demand in recent years for hydrogen-generating devices for use at filling stations, amid the anticipated spread of fuel cell automobiles, considered to be the ultimate clean car.

We have also developed an LPG model, HYSERVE-300P, which went on sale in January 2015.

In April 2019, Osaka Gas Liquid Co., Ltd., a member of the Daigas Group, began selling HYSERVE-5, a small hydrogen generator with a capacity of 5 m³ N/h per hour. For customers with modest energy needs, hydrogen can be supplied in gas tanks or cylinders known as curdles. However, for those customers located a distance away from a hydrogen manufacturing center or delivery station, the price of hydrogen has tended to be higher, as the delivery cost is higher and systems require tanks to be replaced before the hydrogen is fully depleted.

HYSERVE-5 enables hydrogen to be produced efficiently on a customer’s premises in accordance with the volume required. As a result, hydrogen can be supplied at a reasonable price. In addition, a lot of trouble is saved by eliminating tank delivery and hookup. In addition, demand for smaller-sized hydrogen generators is expected to increase with the spread of fuel cell forklifts and other hydrogen-powered equipment. Hydrogen can be supplied for such new usages at reasonable prices by introducing the HYSERVE-5 hydrogen generator.

The HYSERVE series offers the effective production of hydrogen from piped gas or LP gas in a lineup that can meet the demand of customers whether small or large.

In step with the development of hydrogen-generating devices, Osaka Gas has been conducting empirical research on hydrogen filling stations for their diffusion since FY2002. In April 2015, the company opened Kita-Osaka Hydrogen Station, which is equipped with “a HYSERVE-300” hydrogen generator, in Ibaraki City, Osaka Prefecture. In March 2016, we also opened Kamitoba Hydrogen Station, a movable filling station in Kyoto City. At each filling station, hydrogen generated from city gas is provided to fuel cell vehicles.

Osaka Gas will continue to support the creation of a low-carbon society through the establishment of hydrogen-supplying infrastructure and the development and sales of hydrogen generators.

Utilization of Unused Energy

A pilot project was launched in Thailand to study the feasibility of refining biogas into high-purity methane gas for supply to natural gas-powered vehicles as fuel.

Feasibility study pilot plant

Feasibility study pilot plant

Osaka Gas launched a biogas-refining pilot project in Thailand jointly with Agriculture of Basin Co. Ltd. (ABC), a local concern. The project studies the feasibility of removing carbon dioxide and other impurities from biogas generated in the process of palm oil production, and refining it into high-purity methane gas for supply to natural gas-powered vehicles.

Since agriculture is one of Thailand's most prominent industries, there is an abundance of biomass resources. These include palm residue, the remnants of sugarcane crushed to extract juice, and food factory wastewater. Natural gas-powered vehicles are also becoming increasingly prevalent in Thailand. Meanwhile, Osaka Gas has been engaged in developing biogas-refining technology since 2012 in the pursuit of effective utilization of unused biogas. The Company is capable of producing high-purity methane gas with the world's highest efficiency in methane recovery at a rate* of more than 99%. It has achieved this through its proprietary hybrid biogas refining system, which combines a CO2 separation membrane with Pressure Swing Adsorption (PSA), a technology that selectively adsorbs and removes CO2.

Osaka Gas decided to carry out a pilot project in Thailand based on our confidence in the potential to reduce greenhouse gas emissions by using our proprietary hybrid biogas-refining system to effectively utilize abundant biomass resources in Thailand. Osaka Gas will test-operate a 250 m³ N/h biogas-refining system designed for commercial deployment. The feasibility study will focus on verification of stable operation over an extended period of time and methods to minimize the cost of producing methane gas, as well as to determine the effectiveness of the methane produced as vehicle fuel.

Based on the outcome of pilot testing, ABC will actively continue developing initiatives to effectively utilize the biogas being generated continuously at the factory as a fuel for natural gas-powered vehicles.

* Methane recovery rate of 99% or higher
Percentage of methane in high-purity methane gas product relative to methane in biogas from raw material

Unique Hybrid Biogas-Refining System Developed by Osaka Gas

Unique hybrid biogas-refining system developed by Osaka Gas

Development of a high-efficiency methane fermentation system to help resolve waste and resource depletion issues

Osaka Gas is developing a high-efficiency methane fermentation system employing biotechnology to help resolve waste reduction and fossil resource depletion issues. This system uses technology (solubilization) that dissolves raw garbage and other organic waste (biomass) at high temperature (80℃), thereby increasing the methane gas generated by 20% over biomass dissolution by conventional fermentation processes. This technology also makes stable methane fermentation possible by solubilizing high-oil organic waste for which methane fermentation is difficult.

In 2009, we participated in the Kyoto Biocycle Project, a project for developing technology to combat global warming organized by the Ministry of the Environment and supervised by local governments and universities, which verified the effectiveness of ultra-high-temperature solubilization technology using school lunch garbage and other waste. These results will be utilized in future to study the practical application of methane fermentation processing to domestic food waste, an approach being considered by local governments.

Verification test for a small-scale biogasification system

Osaka Gas has been working with Daiki Axis Co., Ltd., to jointly develop small-scale biogas devices that biogasify small volumes of food waste economically.

The use of conventional biogasification systems has been deemed impractical in terms of installation space and cost in small-scale food product factories, apartment complexes and other facilities generating small volumes of food waste (less than one ton per day). Small-scale biogasification devices integrate the receiving tank, the solid/liquid separator tank, the biogasification tank, and the wastewater processing tank all into one tank, and substantially reduce pumps and other machinery/devices. This makes the equipment more compact and reduces installation costs.

Demonstration testing began in November 2014 using test equipment able to process about 400 kg per day, and it was confirmed that more than 100 m³ of biogas could be reliably produced for each ton of food waste generated by restaurants.

Details of Biogasification System

Details of Biogasification System

Commercialization of energy-creating wastewater treatment process

Energy-creating wastewater treatment process in commercial operation

Energy-creating wastewater treatment process
in commercial operation

Wastewater containing aromatics, which comes from facilities such as semiconductor and chemical plants, has been difficult to process under conventional methods. Combustion treatment is used, but this generates significant CO2 emissions and results in high costs.

Osaka Gas has developed a method that can break down organic substances in wastewater easily and rapidly by passing high-temperature, high-pressure wastewater through a catalyst specially processed using nickel. In this treatment process, a flammable gas is generated and effectively used to power the boilers and other equipment on-site. Compared to combustion treatment, this method reduces CO2 emissions approximately 110%* and results in wastewater treatment costs that are approximately 40% lower.*

The system won the Environmental Minister's Award for Global Warming Prevention Activities in FY2015.

*Calculation of CO2 emissions and wastewater treatment cost
It is the case when processing wastewater amount is 200 m³ per day.

Energy-creating Wastewater Treatment Process

Energy-creating Wastewater Treatment Process

Technology to convert thermal energy into light with a wavelength suitable for power generation by a solar cell

Osaka Gas and Kyoto University joined hands and succeeded for the first time in developing technology to convert thermal energy into light with a wavelength whereby a solar cell can generate electricity most efficiently. The development is expected to improve power generation efficiency using thermal energy sources.

In our joint studies, Osaka Gas and Kyoto University used silicon, a chemical element mainly used to develop semiconductors, to form a photonic nanostructure. We used this structure to develop a thermal radiation light source that exclusively emits light with a wavelength whereby a solar cell can generate electricity efficiently when the temperature is high. A power generation efficiency of 40% or higher is expected with this technology—much higher than the figure of around 20% recorded with an ordinary solar cell. Thermal sources are not limited to solar power with this technology. Equally efficient power generation can be expected using other thermal sources such as combustion heat.

Conceptual Image of Conversion of Thermal Energy into Light through a Thermal Radiation Light Source

Conceptual image of conversion of thermal energy into light through a thermal radiation light source

Efforts in the Life & Business Solutions Business

Method proposed by Osaka Gas to test activated carbon fibers recognized as being harmonious with ISO International Standards

A method to test activated carbon fibers, whose draft was compiled by the liaison group called “Japan Activated Carbon Fiber Association,” lead managed by Osaka Gas, was approved by the International Organization for Standardization (ISO). In November 2017, the method was published as an ISO international standard.

Activated carbon fiber, developed in Japan and now under production by companies including Ad'all Co., Ltd., a Daigas Group company, is a product with excellent removal performance of harmful substances. The method was proposed to the ISO based on the Japanese Industrial Standards we have already acquired, using a fast-track proposal method. As a result, the method was recognized two years after the submission of the proposal, much faster than the period of at least three years required under the normal procedure.

With the diffusion of this method around the world, the function of activated carbon fibers of being able to remove harmful substances is likely to be recognized widely, possibly enhancing trust in products containing such fibers that are marketed in Japan. Consequently, environmental preservation will be promoted with safety and security expected to increase regarding people's lives.

Technology to mitigate air pollution

NNC panel installed alongside Route 23

NNC panel installed alongside Route 23

Osaka Gas developed the NNC Panel (NOx & Noise Cut Panel), the first of its kind in the world designed to reduce NOx, an air pollutant, and street noise at the same time. The panel, made of carbon materials, has already been installed on soundproof walls erected alongside a section of Route 23 in Nagoya City, marking its first practical use.

In recent years, health concerns from inhaling PM2.5 (fine particles with a diameter of 2.5 micrometers or less) has grown worldwide. NOx is considered one of the main sources of PM2.5 and effective ways of reducing the chemical compound are being explored. The NNC Panel uses activated carbon fiber (ACF*), which is said to be capable of removing more than 70% of the NOx in the atmosphere and is also durable. ACF used in the panel also functions to reduce noise. ACF is a fine textile with a miniscule diameter of 15 micrometers, a characteristic that enables the fiber to absorb sound. The ability of ACF used in the panel to absorb sound is equal to conventional sound-absorbing materials such as fiberglass.

The ACF is shaped like pleats because that shape can increase the fiber's contact with the atmosphere. In addition, the structure of the sound-absorbing panel used in the NNC Panel has been upgraded to enable the effective intake of air. As a result, the noise reduction level reached 33.3 dB, far topping the benchmark 25 dB set by NEXCO, while significant air purification was achieved. (A test to measure the sound transmission loss showed that noise was cut by 33.3 dB for sound sources with a center frequency of 400 Hz.)

Osaka Gas will continue to step up marketing of the NNC Panel through its subsidiary Osaka Gas Engineering Co., Ltd., targeting places where atmospheric purification and noise reduction are necessary, such as soundproofing walls on expressways and trunk roads.

* Activated Carbon Fiber
Osaka Gas previously produced gas from coal. ACF is one of the technologies developed by the company to effectively use coal tar, a by-product of producing gas from coal.

Pilot Project for ACF Air Purification Units in the Republic of Indonesia Launched

ACF units installed in Jakarta

ACF units installed in Jakarta

Osaka Gas Engineering Co., Ltd. (OGE), a subsidiary of the Daigas Group, started a demonstration project in September 2018 to reduce a roadside air pollutant, nitrogen oxide (NOx), by using an air purification system with activated carbon fiber (ACF) in Indonesia. The project, intended to demonstrate the effectiveness of the system and promote its widespread installation, has been adopted by the Japan International Cooperation Agency (JICA) as one of its Collaboration Programs with the Private Sector for Disseminating Japanese Technologies for the Social and Economic Development of Developing Countries.

Amid intensified traffic congestion due to rapid economic growth and associated changes in the living environment recently, Jakarta, the capital city of Indonesia, has been facing severe air pollution on roadways. In central Jakarta, for instance, the concentration of NOx, a substance that causes respiratory disease, is nearly twice the level set by World Health Organization (WHO) guidelines.*1 The incidence rate of asthma among children aged 13 to 14 is several times higher than in Japan.*2

To improve air quality in Indonesia by using the ACF air purification technology of the Daigas Group, OGE applied for the above JICA project, repeatedly discussed the details and negotiated with the Indonesian Ministry of Public Works and Housing, and finally installed the ACF units, right in front of a general hospital on the national highway,*3 in the southern part of Jakarta. The system features: (1) air purification by using natural wind without using electric power; (2) refreshable NOx removing capacity by hosing with water or naturally by rain, and thus easy maintenance and long-term benefits—for effectively mitigating air pollution in developing countries. With support from JICA, OGE is verifying the system’s effectiveness in Indonesia’s tropical environment over a period of one year.

Jakarta Polices Traffic Directorate, BPLHD Jakarta, 2014
International Study Asthma and Allergies in Childhood, 2012
Jalan TB Simatupang, South Jakarta, DKI Jakarta Province

Simulation technology developed by Osaka Gas

Development of highly efficient, compact industrial burner required few prototypes
Temperature increasing as an item is heated

Temperature increasing as an item is heated

Impulse burner (Example of a recuperative burner)

Impulse burner
(Example of a recuperative burner)

Osaka Gas applies simulation technology in the development of industrial burners in order to enable customers to achieve higher levels of energy efficiency at their own sites. Among the various types of industrial burner, it used to take a lot of time and effort to determine the optimal operating conditions for large industrial burners and to design such burners. By performing simulations, however, it is possible to predict combustion properties under various conditions and with various shapes, enabling the optimal solution to be identified in a short space of time.

Use of predicated power generation at wind farms for the assessment of project feasibility
Hirogawa Myojinyama Wind Farm in Wakayama Prefecture

Hirogawa Myojinyama Wind Farm in Wakayama

To assess the viability of wind power, you must be able to predict how much power will be generated with a high degree of accuracy and certainty. And since many wind farms in Japan are in mountainous areas, you must be able to predict how the wind will react to the terrain. Osaka Gas has experience in simulations involving predicting how exhaust gas is dispersed from cogeneration systems around buildings and in urban areas. We applied this expertise to predicting the generating amount of a wind farm, a big help in our development of highly efficient, natural energy system.

Amount of Electricity Predicted through Simulations and Actual Amount of Electricity

Amount of Electricity Predicted through Simulations and Actual Amount of Electricity
Use of a weather simulation model to forecast energy demand and support operations of renewable energy systems
Example of weather simulation (amount of sunlight)

Example of weather simulation
(amount of sunlight)

Example of weather simulation (wind velocity)

Example of weather simulation
(wind velocity)

The consumption of energy such as electricity and gas, and the amount of electricity generated through natural energy sources, such as solar power and wind power, are greatly influenced by weather conditions, prompting Osaka Gas to step up development and implementation of weather simulation technologies.

Osaka Gas uses Weather Research Forecasting (WRF), a weather simulation model developed by a U.S. research laboratory, while combining it with data from the Japan Meteorological Agency’ and weather stations outside of Japan. The Company limits the use of WRF to western Japan regions and forecasts their weather and solar radiation quantity within an area of 2 square kilometers, up to about three days ahead. By using WRF in such a manner, Osaka Gas can obtain more accurate and detailed weather data than that which could be expected from standard weather forecasts. The effectiveness of the system has been proven within the Daigas Group, and in September 2018 approval was obtained from the Japan Meteorological Agency for a system to supply customers with weather information.

Development of biodegradable plastic film composed mainly of plant-derived polylactide plastic

Polylactide plastic bag

Polylactide plastic bag

Osaka Gas has developed biodegradable plastic film by improving polylactide (PLA) to render it soft and extensible.

PLA is a biodegradable plant-derived plastic, which is traditionally difficult to form (by inflation molding) into a film bag because of its hardness and brittleness. Using the long-cultivated plastic reforming technology, Osaka Gas has successfully developed an improved PLA plastic that can be formed into a soft and strong film without losing its biodegradability.

Because of the biodegradable characteristics, the developed PLA plastic has various other applications, including bags for throwing garbage into compost bins, and agricultural multi-purpose film that need not be removed from farming land or incinerated. The PLS plastic film is expected to contribute to resource recovery from waste and reductions in both CO2 emissions and fossil fuel use.

Development of a 3HB (ketogenesis) biogas process for organic materials that employs bioprocesses


In a joint project with the National Institute of Advanced Industrial Science and Technology, Osaka Gas has employed a bioprocess (fermentation) to develop a method of producing (R)-3-hydroxybutyric acid (3HB).

3HB is a distinctive bioprocess compound that is high in purity and low in cost—something that is difficult to obtain from chemosynthesis processes.

3HB has drawn public attention as a process of ketogenesis. It is synthesized within the human body and has various bioactive functions, so it is hoped that it will eventually be possible to use it for new biological functions. And due to its chemical structure, 3HB is also expected to have potential as a material capable of reducing the environmental impact of medicines, food products, and biodegradable plastics by being used as a new raw material for biodegradable polymers or as a polymer additive.

The bioprocess we developed employs a unique type of Halomonadaceae bacteria identified by the National Institute of Advanced Industrial Science and Technology. Aerobic fermentation is used to cause biopolyester (PHB) to accumulate in the cells, after which a switch is made to anaerobic fermentation (culturing the microorganism in the absence of oxygen). This causes the PHB accumulated in the cells to hydrolyze and be released from the bacteria as 3HB.

By separating, concentrating, and purifying the 3HB released from the cells using conventional methods, we succeeded in producing 3HB with a purity of 95% or more at low cost.

Although there have been many reports of bioprocesses being used to accumulate 3HB, it is the first time in the world that 3HB has been efficiently generated and isolated.

Development of fluorene cellulose with potential for use as a heat-resistant plastic filler material

Fluorene Cellulose

Osaka Gas has developed fluorene cellulose obtained by causing a chemical reaction between a fluorene derivative and the surface of cellulose fibers.

Cellulose is the most abundant biomass material on the planet, and is the main component of wood and paper. Fiber comprised of cellulose (cellulose fiber) one-fifth the weight of steel yet is five times stronger. In addition, because its linear thermal expansion coefficient* is 1/50 that of glass, it is expected to be usable as a plastic filler material (fiber for strengthening plastic). It would be an alternative to fillers such as glass fiber, and offer superior heat resistance.

However, because cellulose fiber is extremely hydrophilic (have a strong affinity with water), it is difficult to combine it with plastic, which is hydrophobic (has a weak affinity with water), which has made it hard to use it as a plastic filler.

However, by causing a reaction between our own fluorene derivative and the cellulose fiber surface, we have succeeded in developing a fluorene cellulose that is hydrophobic. This fluorene cellulose is easily mixed with plastics such as polylactic acid, and as plastic filler derived from biomass, it offers potential for use as an eco-friendly structural material for home appliances and automobiles.

This development project is underway jointly with Osaka Gas Chemicals, Co., Ltd., which is in charge of commercialization.

* Linear thermal expansion coefficient
This coefficient shows the ratio of the increased length when temperature is raised by 1 degree Celsius compared to the original length.

Development of an environment-friendly material geopolymer concrete

Geopolymer concrete being formed at an engineering site from a revolving drum-type mixer

Geopolymer concrete being formed at an
engineering site from a revolving drum-type

Osaka Gas is working on the development of geopolymer concrete, which has drawn public interest as a new environment-friendly material.

Geopolymer concrete, made from fly ash, an industrial byproduct, is known as next-generation concrete. It has stronger acid and heat resistance than conventional concrete materials. Geopolymer concrete is said to be suitable for use in facilities where strong acids are generated, such as sewage plants, and where temperatures are high, such as steel mills. Since it does not use cement, the concrete emits about 80% less CO2 in its manufacturing process. In view of this environmental friendliness, the industry hopes that geopolymer will become significantly disseminated.

Geopolymer concrete starts hardening faster than other concrete materials, while solidification at high temperatures is necessary for its strength to reach the required level. In light of these characteristics, the concrete has mainly been produced at factories for secondary use at construction sites. However, Osaka Gas has established a method to produce the concrete for on-site use at construction and engineering sites. This achievement, the first in Japan, was made in collaboration with Nishimatsu Construction Co., Ltd. and Obayashi Corp.

Experimental Residential Complex “NEXT 21”

The NEXT 21 Phase-4 Habitation Experiment Launched

The “NEXT 21” Phase-4 Habitation Experiment

Osaka Gas launched a new five-year habitation experiment (the fourth phase of the experiment) in June 2013 at its experimental residential complex “NEXT 21”* (Tennoji-ku, Osaka City; 18 housing units with a total floor area of 4,577 m², six stories above the ground and one story underground), and in FY2016, it presented an interim report on its findings for the two-year first half of the period.

Environmentally friendly enriched lifestyles are the aim of the urban multiple-unit housing under the phase-four experiment, lasting until around 2020. The experiment is directed at how to concretize proposed ideal lifestyles creating links between people, rebuilding the relationship between human beings and nature and achieving an energy-saving and smart way of living.

In examining housing and lifestyles, we confirmed that setting up an intermediate domain between the private spaces of residences and the public spaces of common areas can create links between people and enhance comfort. In testing energy systems by utilizing “Ene-Farm type S” to transfer electric power and heat between houses and making maximum use of “Ene-Farm type S” presupposing a reverse power output flow, we achieved a 31% reduction in energy consumption and a 51% reduction in CO2 generation.

Going forward, we will ascertain future social issues and needs and develop comprehensive lifestyle proposals from the perspectives of housing and energy.

* Experimental residential complex “NEXT 21”
The “NEXT 21” was constructed in October 1993 by Osaka Gas to propose an ideal neo-futuristic urban multiple-unit housing under the concept of “Achieving both comfortable and convenient life and energy-saving / environmental preservation.” The demonstration experiments were conducted in four phases over the past 25 years, with Osaka Gas's employees and their families residing in the housing. Each phase was designed to meet the theme suited to the times. Demonstration experiments were conducted on a variety of themes, including energy saving for the entire building, reducing its CO2 emissions, greenery restoration and environmental symbiosis in urban areas, ideal forms of residence that reflect diverse lifestyles, and product development. Also, many proposals and presentations that may lead to ideal multiple-unit housing in the future have been made at a time when the liberalization of the energy market is advancing. Some of the proposals have been commercialized.

“Eco Purge” Vehicle Developed to Lower Gas Pressure in Medium-Pressure Gas Holders

On-site decompression
On-site decompression

On-site decompression

Osaka Gas introduced its first “Eco Purge” vehicle in 2004. The vehicle is designed to return town gas remaining in medium-pressure gas holders or medium-pressure pipes through a medium-pressure pipe network when the gas pressure is reduced from medium pressure to low pressure, by sucking out the gas and compressing it using a gas engine-driven compressor. The fourth model, developed and introduced in 2013, incorporates improved noise reduction. In 2016, we developed and introduced a small noise-reduction vehicle that can be used even on narrow roadways. In 2017, a new vehicle No. 5 with the same performance level as the No. 4 was introduced.

Before the “Eco Purge” was developed, gas pressure was reduced by burning the remaining gas in a gas holder or pipe using a burner. The environmentally friendly “Eco Purge” was developed to reduce the load on the environment. At present, six “Eco Purge” vehicles are in use, contributing to an annual cut of about 120,000 m³ in unnecessary gas consumption and an annual reduction of about 2,000 ton of CO2 emissions.

Principle of Decompression

Principle of Decompression

Collaboration with Various Corporate Partners and Startups Both in Japan and Abroad

As part of our efforts to strengthen open innovation, in July 2017 we participated in a program sponsored by Plug and Play, LLC, a leading accelerator for Silicon Valley in the Untied States, in the field of energy sustainability. We are gaining ground with our search for the latest technologies and services, with the aim of accelerating our own technological development and creation of new services.

As part of our effort to collaborate with startups based mainly in Japan and the United States, in April 2018, Osaka Gas invested in WiL Fund II, L.P. an U.S.-based venture investment fund run by WiL, LLC, a venture capital firm based in Silicon Valley. With leveraging WiL's expertise in new business creation, Osaka Gas aims to accelerate innovative development for its energy businesses in order to provide customers with higher value-added life services and business solutions featuring digital technologies such as IoT and AI, and to establish an advanced infrastructure operation system with cutting-edge technologies.

Commencing Kansai’s First LNG-fuel to LNG-Fueled Tugboat Ishin

Osaka Gas and OGCTS Co., Ltd., a subsidiary of the Daigas Group, supplied fuel to the liquefied natural gas (LNG)-fueled tugboat* Ishin, developed by Mitsui O.S.K. Lines, Ltd. in January 2019 at Sakai-Senboku Port for the first such fueling in Kansai.

The Ishin, owned by Mitsui O.S.K. Lines, was built by Kanagawa Dockyard Co., Ltd. and is operated by Nihon Tug-boat Co., Ltd. In October 2016, the International Maritime Organization decided to introduce tighter regulations on sulfur oxide (SOx) emissions in sea areas including Japan in 2020. Under the leadership of the Ministry of Land, Infrastructure, Transport and Tourism, Japan has been actively promoting LNG bunkering—the supply of liquefied natural gas to ships—increasing the possibility of expanded consumption of LNG, an environmentally friendly fuel in marine transportation in coming years.

The fuel supply project has come to fruition owing to the port improvement by the Port and Harbor Bureau of the Osaka Prefectural Government and the construction of an LNG fuel supply system by Osaka Gas that is compliant with the applicable laws and regulations in collaboration with other stakeholders including Mitsui O.S.K. Lines. Based on the expertise gained through the project, we will explore expanding the LNG bunkering service.

* Tugboat
A tugboat is a small vessel used to assist large vessels and marine structures when they reach or leave the wharf or pier.

LNG bunkering

LNG bunkering

CSR of Daigas Group

President's Commitment
Management and CSR of the Daigas Group
Policies on CSR
Special Feature
The Daigas Group addresses social issues with its human resources and technical expertise
Corporate Governance
Stakeholder Engagement
Value Chain of the Daigas Group
Actions on Materiality
CSR Charter Ⅰ
Creating Value for Customers
CSR Charter Ⅱ
Harmonizing with the Environment and Contributing to Realizing a Sustainable Society
CSR Charter Ⅲ
Being a Good Corporate Citizen Contributing to Society
CSR Charter Ⅳ
Complying with Laws and Regulations and Respect for Human Rights
CSR Charter Ⅴ
Management Policy for Human Growth
ESG Data

President's Commitment
Management and CSR of the Daigas Group
Corporate Principles and CSR Charter
Daigas Group Code of Conduct
Global Compact and ISO 26000
Long-Term Management Vision 2030
Medium-Term Management Plan 2020
CSR Integrated into
Management Strategy
Policies on CSR
Special Feature The Daigas Group addresses social issues with its
human resources and technical expertise
Reducing greenhouse gas emissions
through efficient use of natural gas and expansion of renewable energy
Constructing resilient infrastructure for disaster-resistant urban development
Promoting the evolution of ICT/IoT
services to solve customer problems
Corporate Governance
Corporate Governance
Risk Management
CSR Management
Stakeholder Engagement
Dialogue and Cooperation with Stakeholders
Response to Stakeholders' Voices
Value Chain of the Daigas Group
Enhancement of CSR in Our Value Chain
Social Impact of Business Activities in Our Energy Value Chain and Efforts to Reduce Such Impact
CSR Efforts Throughout Supply Chain
Electricity and Gas Industry Reform
Actions on Materiality
Customer Health and Safety
Energy / Emissions
Local Communities
Customer Privacy
Supplier Assessment
Training and Education
Diversity and Equal Opportunity
Economic Performance
CSR Charter Ⅰ
Creating Value for Customers
CSR Indicator
Safety and Security 1: Procurement Stage
Safety and Security 2: Processing Stage
Safety and Security 3: Distribution Stage
Safety and Security 4: Consumption Stage
Incorporating Customer Opinions
Proposing New Value
CSR Charter Ⅱ
Harmonizing with the Environment and Contributing to Realizing a Sustainable Society
CSR Indicator
Environmental Management
Environmental Management:
Indicators, Targets and Results
Actions for Climate Change:
Recognition of and Action on Risks and Opportunities
Actions for Climate Change: Method to Evaluate Effects of CO2 Emissions Reduction
Actions for Climate Change: Working to Reduce CO2 Emissions in Business Activities
Actions for Climate Change: Working to Reduce CO2 Emissions at Customer Sites
Efforts in Resource Recycling
Conserving Biodiversity
Developing Environmental Technologies
Addressing Environmental Risk
Green Purchasing and Green Distribution
Environmental Communication
CSR Charter Ⅲ
Being a Good Corporate Citizen Contributing to Society
CSR Indicator
Social Contribution Activities
Corporate Volunteering Activities under the “Small Light Campaign”
Activities for Promoting Communication with Society
Activities at Osaka Gas' Foundations
CSR Charter Ⅳ
Complying with Laws and Regulations and Respect for Human Rights
CSR Indicator
Compliance Promotion Efforts
Action on Human Rights
Efforts for Protection of Personal Information
Information Security
Consultations and Reports from Partner Companies
CSR Charter Ⅴ
Management Policy for Human Growth
CSR Indicator
Acceptance of Diversity
Balancing Work and Family
Human Resource Development and Rewards
Communication Between Employees and Company
Improving Occupational Health and Safety
ESG Data
Environmental Performance Data
Social Data
Governance Data
CSR Report Policy
Commendation from the Outside
Third-Party Review / Third-Party Verification
Course Taken Since the Company's Foundation
Reporting Guidelines
CSR Report 2019 Terminology
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We Value Your Feedback
Osaka Gas in brief
CSR Site Map