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

Efforts Contributing to Realizing a Low-Carbon Society

Aspects Determined as Materiality

  • Emissions

Principle and Outline

In view of the worldwide trend to combat climate change, the Daigas Group is working on reducing emissions of greenhouse gases generated through our business activities, such as CO2 and methane (CH4), in order to help bring about a low-carbon society. Specifically, we are reducing CO2 emissions when transporting liquefied natural gas (LNG), when manufacturing city gas and when generating electricity. We are also taking various company-wide steps to promote energy saving in business offices while verifying whether our energy-saving efforts have produced the intended results in our own buildings.

GHG Emissions at Daigas Group

Initiatives to reduce CO2 emissions from energy consumption and methane (CH4) emission

In the Daigas Group, we work to reduce CO2 emissions from energy consumption and methane (CH4), the main component of natural gas in the gas business and in the thermal supply and power generation businesses, as well as CO2 emissions from energy consumption at affiliates.*

* Affiliated Companies
Of Osaka Gas's 138 consolidated subsidiaries, 57 companies are subject to the calculation of GHG emissions. Those housed in office buildings as tenants and whose environmental data are difficult to grasp and whose environmental effects are minimal are not subject to such calculation. Also excluded from the calculation are overseas companies whose environmental impacts are minimal. However, the aggregate number of companies may differ by fiscal year and by item due to company mergers and others.
(As of March 31, 2018)
Group companies No. of
companies
Company names
LNG Terminal & Power Generation Business Unit 14 Gas and Power Co., Ltd., Nakayama Joint Power Generation Co., Ltd., Nakayama Nagoya Joint Power Generation Co., Ltd., Hirogawa Myojinyama Wind Farm Co., Hayama Wind Farm, Yura Wind Farm Development, Hizen Wind Farm, Hirao Wind Farm, Senboku Natural Gas Power Generation, Osaka Gas Liquid Co., Ltd., Cold Air Products Co. Ltd., Cryo-Air Co. Ltd., Kinki Carbonic Co., Ltd., Gasnet Co. Ltd.
Pipeline Business Unit 2 Kinpai Co., Ltd., Osaka Gas Renotech Co., Ltd.
Residential Energy Business Unit 12 Living Maintenance Service Hokuto Co., Ltd., Living Maintenance Service Osaka Co., Ltd., Osaka Gas Cooking School Co., Ltd., Create Kansai Co., Ltd., Osaka Gas Customer Relations Co., Ltd., Aqua Brain Co., Ltd., Kansai Business Information Inc., Osaka Gas Housing & Equipment Co., Ltd., Osaka Gas Security Service Co., Ltd., Osaka Gas LPG Co., Ltd.. Nissho Gas Supply Co., Ltd., Daiya Nensho Co Ltd.,
Commercial & Industrial Energy Business Unit 9 OGCTS Co., Ltd., G & M Energy Service Co., Ltd., Ashiyahama Energy Service Co., Ltd., Rokko Island Energy Service Co., Ltd., Enetec Kyoto Co., Ltd., Enetec Osaka Co., Ltd., Nabari Kintetsu Gas Co., Ltd., Toyooka Energy Co., Ltd., Shingu Gas Ltd.
Group Headquarters 8 OG Sports Co., Ltd., Osaka Gas Autoservice Co., Ltd., Osaka Gas Finance Co., Ltd., Osaka Gas Business Create Co., Ltd., Active Life Inc., KRI Inc., Osaka Gas Engineering Co., Ltd., i-support Co., Ltd.
Osaka Gas Urban Development Group 3 Osaka Gas Urban Development Co., Ltd., Osaka Gas Facilities Corp., Kyoto Research Park Co., Ltd.,
OGIS Research Institute Group 6 OGIS-RI Co., Ltd., Sakura Information Systems Co., Ltd., SIS Techno-Service Co., Ltd., JOE Corp., Ltd., Ube Information Systems Inc., System Answer Inc.
Osaka Gas Chemicals Group 3 Osaka Gas Chemicals Co., Ltd., Minabe Chemical Industries Ltd., Mizusawa Industrial Chemicals, Ltd.
Total 57

GHG Emissions* (1,000 t-CO2e)

(FY) 2014 2015 2016 2017 2018
Consolidated companies (Osaka Gas and its affiliates) 77 74 69 65 58
Total 4,335 4,203 4,164 4,363 5,159
Osaka Gas 287 240 212 259 259
LNG terminal 88 90 93 88 84
Power plant 141 92 65 120 124
District heating / cooling 13 12 11 11 10
Other 45 46 43 40 41
Affiliates 4,048 3,963 3,952 4,104 4,900
Power generation 3,679 3,666 3,622 3,783 4,581
District heating / cooling 171 112 107 108 104
Other 198 185 224 214 215
* GHG emissions
[CO2 emissions]
CO2 emissions calculated using the average emission factor for thermal power source are subject to management in the Daigas Group so that the benefit of reducing the consumption of purchased electricity can be properly evaluated.
CO2 emissions for FY2017 were calculated using the average emission factor of 0.65 t-CO2 / 1,000 kWh, a figure decided under a government plan to combat global warming, approved by the Cabinet in 2016. CO2 emissions through FY2016 were calculated using the factor of 0.69 t-CO2 / 1,000 kWh, a figure shown in an Interim Summary Report compiled in 2001 by the Target Attainment Scenario Subcommittee under the Global Environmental Committee of the Central Environmental Council.
[CH4 emissions]
CH4 emission is calculated using the global warming factor of 25, defined in the UNFCCC reporting guidelines on annual greenhouse gas inventories published in 2012. Greenhouse gas emissions are defined as the aggregate of CO2 emissions and CO2 equivalent of CH4 emissions.

(Reference) GHG Emissions for Comparison* (1,000 t-CO2e)

(FY) 2014 2015 2016 2017 2018
Total 4,248 4,141 4,089 4,283 5,073
Osaka Gas 268 218 185 239 239
LNG terminal 73 75 73 75 72
Power plant 141 92 65 120 124
District heating / coolings 12 11 10 10 9
Other 39 40 36 33 34
Affiliates 3,983 3,923 3,904 4,045 4,834
Power plant 3,671 3,672 3,619 3,781 4,579
District heating / cooling 153 103 97 98 94
Other 159 149 188 167 162
* GHG emissions for comparison
For calculation of the yearly CO2 emissions of purchased electricity, the most recent emission factor of the Kansai Electric Power Co., Inc. is used. (e.g. The CO2 emission factor of FY2015 is calculated based on the emissions during FY2014) CO2 emissions of FY2016 and after are calculated using emission factors of electric companies from which we purchased electricity. The yearly CO2 emissions of purchased electricity is calculated by multiplying the year's electricity consumption by the year's emission factor.

CO2 emissions from Osaka Gas's city gas business

CO2 emissions in Osaka Gas's city gas business for FY2018 were 125,000 tons, resulting in CO2 emissions per cubic meter of gas production (emissions intensity) of 14.3 g-CO2 / m³. Compared to 1990, the Kyoto Protocol's benchmark year, total CO2 emissions were down by 53% and emissions on a per-unit basis fell by 76%.

Reasons for this decrease include the use of cogeneration systems at city gas processing plants, a reduction in purchased electricity as a result of the active use of cryogenic power generation, energy efficient operations, and aggressive efforts to conserve energy in office buildings.

In 1979, Osaka Gas became the first company in the world to begin operation of a cryogenic power generation facility, and in FY2018 the Senboku Terminal and the Himeji Terminal produced approximately 83.00 million kWh cryogenically.

We will work toward further CO2 emission reductions by aggressively using electricity produced by unused energy such as LNG cryogenics and gas pressure of gasification, as well as by promoting energy saving in office buildings.

CO2 Emissions from the City Gas Business of Osaka Gas

CO2 Emissions from the City Gas Business of Osaka Gas

Methane emissions from Osaka Gas's city gas business

In the city gas business of Osaka Gas, methane (CH4) gas is emitted during measurement of gas quality and gas fitting work. We therefore strive to reduce emissions by introducing a system that can recollect gas without it being released into the air after the measurement, by employing a no-blow gas shutting-off method and using an Eco Purge vehicle.

Methane gas emissions were 77 tons in FY2018, a reading indicating that the downtrend remains intact.

Methane Emissions at Osaka Gas

(FY) 2014 2015 2016 2017 2018
Methane emission (t-CH4) 103 94 92 75 77

CO2 emissions from affiliates

CO2 emissions from affiliate companies amounted to about 4.9 million tons in FY2018. Most of the total comprised CO2 emitted at fossil-based power stations. The Daigas Group is striving to curb CO2 emissions from its business operations and at the same time achieve energy savings by combining the operation of energy-efficient fossil-derived power stations with the use of renewable energy sources.

Efforts by the Daigas Group to Reduce CO2 Emissions from City Gas Business

Efforts to reduce CO2 emissions in LNG transportation

New LNG tanker: “LNG MARS”

New LNG tanker: “LNG MARS”

In October 2016, Osaka Gas put into service the fuel-efficient “LNG MARS” for the transport of LNG, an essential material for city gas. “LNG MARS” has become the seventh tanker of our fleet deployed for LNG transport. Osaka Gas adopted new SAYAENDO type vessel, which was instrumental in reducing the vessel's air resistance significantly. The tanker also adopted a new steam turbine, improving fuel efficiency by more than 20% compared with conventional tankers. These features curbed the tanker's CO2 emissions and transport costs.

Efforts to reduce CO2 emissions at city gas processing terminals

We are endeavoring through a variety of energy conservation activities to reduce CO2 emissions at city gas processing terminals.

Reducing CO2 emissions at offices

The Hokubu Gas Building

The Hokubu Gas Building

Fukiaki Office

Fukiaki Office

The “hu+gMUSEUM”

The “hu+gMUSEUM”

BELS table and plate for hu+gMUSEUM

BELS table and plate for hu+gMUSEUM

At offices of each company of the Daigas Group, efforts to achieve targets for energy consumption and CO2 emission are being made under the Environmental management systems (EMS), established based on standards such as ISO 14001, Eco Action 21 developed by the Ministry of Environment and the Osaka Gas Environmental Management System (OGEMS).

Under the EMS, each and every employee strives to reduce his or her own energy consumption by turning off lights and office equipment not currently needed or in use, and setting air conditioning to reasonable temperatures in line with set targets.

The Daigas Group has actively been implementing advanced energy-conservation measures and measures to reduce CO2 emissions when its buildings are renewed or renovated. Measures deemed effective for energy saving are horizontally applied to all office buildings of the Daigas Group under the “Green Gas Buildings” project. As of August 2018, the “Green Gas Buildings” project is applied at nine of the Group's business offices.

When we renovated the Hokubu Gas Building (Takatsuki City, Osaka Prefecture), Osaka Gas incorporated the “Behavioral Observation Method” *1 into the building design process to further promote energy saving. Observation and analysis of the tenants' behavior on energy saving according to the method allowed us to realize reduction of CO2 emissions.

Our offices also introduced monitoring systems such as the “Motto Save,” which is aimed at promoting energy saving at office buildings by deciding their optimal energy use based on building size and the type of building operation. In addition, the Fukiai office of Osaka Gas, located in Kobe City, Hyogo Prefecture, introduced “BCP-Lite,” *2 an emergency power-supply system that enables even a small-sized building not usually equipped with a backup power generator to continue the minimum level of business operations in the event of a natural disaster. Following its introduction, the Fukiai office confirmed that the system could function as designed. The “BCP-Lite” is a system in which the concept of a Business continuity plan (BCP) was added to our conventional energy-saving equipment. We expect this to help the building of a low-carbon society in the future while supporting our business continuity in the event of a contingency.

The “hu+gMUSEUM,” a showroom of Osaka Gas, is equipped with facilities with high energy efficiency, including cogeneration systems, regional air-conditioning systems, solar power generation systems, and solar-heat systems. Furthermore, the Group has built a Smart Energy Network in Osaka City's Iwasaki District where the showroom is situated. The network has played an important role in promoting the region's overall energy saving by establishing an optimal energy control system to ensure the most efficient use of energy (electricity and heat) generated in buildings and devising a high energy security system that can effectively respond to unscheduled power outage.

The Daigas Group received the “Building Energy-efficiency Labeling System (BELS)” *3 assessment for two of its properties in FY 2017. The most recently constructed buildings of the Fukiai Office and the hu+gMUSEUM received four stars and five stars, respectively, under the five-star BELS system for their excellent energy conservation performance. Their respective energy-conservation rates in the year were a high 33% and 39%.

Osaka Gas received the 2018 technology promotion award from the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan for its contribution to local communities and concretization of an advanced energy system through its hu+gMUSEUM showroom, which was recognized as the utility's new information dissemination base.

*1 “Behavioral observation”
“Behavioral observation” is a methodology for identifying and presenting solutions based on the academic analysis of facts and findings obtained through the observation of people's behavior.
*2 “BCP-Lite”
“BCP-Lite” is an emergency power supply system for office buildings in which electricity can be supplied without interruption even if power outage occurs following a natural disaster. A self-driven gas engine heat pump (GHP) is incorporated into the system.
*3 BELS
BELS stands for “Building Energy-efficiency Labeling System.” The labeling system for buildings and housing is aimed at evaluating the energy-saving ability of nonresidential buildings based on the Act on Improvement of the Energy Consumption Performance of Buildings. The evaluation, certified by third parties, is given on a scale of one to five stars. The evaluation result is represented by a number of stars displayed on a special plate.
Smart Energy Network

Osaka Gas structured a district heating and cooling system at the area surrounding the facilities of the Company in Nishi Ward in Osaka City. The system also functions as the Smart Energy Network, where heat and electricity generated in the area are accommodated in the community. The system can be controlled optimally from the perspective of the entire area, realizing an approach to urban planning that allows energy to be used efficiently.

Smart Energy Network

Efforts to reduce CO2 emissions through district heating and cooling systems

Gas-fired, absorption-type water cooler/heater with high efficiency, installed at Kobe Energy Center

Gas-fired, absorption-type water cooler/heater with
high efficiency, installed at Kobe Energy Center

District heating and cooling systems are designed to promote efficient use of energy sources by having people and offices in the same area use energy systems such as air conditioners, heaters and hot-water supply equipment together. In the case of the Daigas Group, such systems were first introduced in Japan in 1970 in the Senri Chuo district of Toyonaka City, Osaka Prefecture. Since then, various energy systems have been adopted by the group in various regions in Japan, each system developed in an optimal manner to reflect each region's needs under its urban development project. The Daigas Group introduced such systems in totaling 10 districts in Osaka, Kyoto, Nara and Kobe. The Daigas Group was ahead of other companies in introducing gas cogeneration systems under the framework of regional-based air-conditioning and heating systems. The group has been also active in starting new businesses, such as accepting waste heat generated under cogeneration systems run by customers and supplying electricity to certain customers as a registered Specified Electricity Utility.

The Daigas Group has been also working to secure stable heat supplies, promoting the advanced use of energy, increasing efficiency in administrative management and cutting business costs. More recently, the group built a Smart Energy Network in Osaka City, which is an energy network system focusing on the utilization of natural gas cogeneration and renewable energy sources. All these measures represent the Daigas Group's efforts to promote both energy conservation and energy security.

The Daigas Group is redoubling its efforts to further increase energy system efficiency by introducing high-efficiency equipment in conjunction with the renewal of facilities Kobe and Senri district.

Efforts to Reduce CO2 Emissions from Electricity Business

The Daigas Group engages in the electricity generation business using various power sources it owns, including fossil-based power generation, gas cogeneration systems and renewable energy sources. The Daigas Group is striving to reduce CO2 emissions—not only from its own business operations but also from operations at customers—by introducing highly energy-efficient fossil-based power generation systems and actively using renewable energy sources.

Power Generation Facilities Operated by the Daigas Group (domestic facilities for power generation)

(As of the end of June 2018)

Name of project Location Power
generation
capacity
Power
generation
method
When
the project
began operating
Natural gas-based power generation
  Senboku Terminal (No. 1 Plant) Sakai City, Osaka Prefecture 20,000 kW GTCC*1 and others July 2002
Senboku Natural Gas Power Generation Co., Ltd.
Senboku Natural Gas Power Plant
(Unit 1, Unit 2: No. 2 Plant of Senboku Terminal)
(Unit 3, Unit 4: No. 1 Plant of Senboku Terminal)
Osaka Prefecture
Unit 1, Unit 2: Takaishi City
Unit 3, Unit 4: Sakai City
Unit 1, Unit 2: 277,000 kW
Unit 3, Unit 4: 277,500 kW
Total 1,109,000 kW
GTCC April 2009 (Unit 2)
May 2009 (Unit 1)
Oct 2009 (Unit 4)
Nov 2009 (Unit 3)
Himeji Terminal Himeji City, Hyogo Prefecture 66,000 kW GTCC and others April 2004
Nakayama Joint Power Generation Co., Ltd. Funamachi Power Plant Taisho Ward, Osaka City 149,000 kW*2 GTCC April 1999
Gas and Power Co., Ltd. Torishima Energy Center Konohana Ward, Osaka City 141,000 kW GTCC April 2002
Gas and Power Co., Ltd.
Uji Energy Center
Uji City, Kyoto Prefecture 67,000 kW GTCC October 2004
Gas and Power Co., Ltd. Settsu Energy Center Settsu City, Osaka Prefecture 17,000 kW Gas engine April 2006
OGCTS Co., Ltd.
Senri Energy Center
Toyonaka City, Osaka Prefecture 7,000 kW Gas turbine January 2008
Coal-based power generation
  Nakayama Nagoya Joint Power Generation Co., Ltd. Nagoya Power Plant Chita County, Aichi Prefecture149,000 kW*2 Coal steam turbine, biomass (5%) April 2000
Nakayama Nagoya Joint Power Generation Co., Ltd.
Nagoya No. 2 Power Plant
Chita County, Aichi Prefecture 110,000 kW*2 Coal steam turbine, biomass (30%) September 2017
Biomass power generation
  Biomass Power Technologies Inc.
Matsusaka Woody Biomass Power Plant
Matsusaka City, Mie Prefecture2,000 kW*3 Exclusively for biomass burning, direct burning plant (air-cooling method) January 2018
Wind power
  Hayama Wind Power Generation Co.
Hayama Wind Farm
Takaoka County, Kochi Prefecture 20,000 kW Wind power (1,000 kW x 20 units) March 2006
Hirogawa Myojinyama Wind Farm Co., Ltd.
Hirogawa Myojinyama Wind Farm
Arida County, Wakayama Prefecture Hidaka County, Wakayama Prefecture 16,000 kW Wind power (1,000 kW x 16 units) November 2008
Yura Wind Development Co. Yura Wind Power Plant Hidaka County, Wakayama Prefecture 10,000 kW Wind power (2,000 kW x 5 units) September 2011
Hizen Wind Power Generation Co., Ltd.
Hizen Wind Farm
Karatsu City, Saga Prefecture 12,000 kW Wind power (1,500 kW x 8 units) March 2005
Hizen Wind Power Generation Co., Ltd.
Hizen Minami Wind Farm
Karatsu City, Saga Prefecture 18,000 kW Wind power (1,500 kW x 12 units) January 2008
Hirao Wind Development Co. Hirao Wind Power Plant Kumage County, Yamaguchi Prefecture 9,000 kW*4 Wind power (1,500 kW x 6) February 2009
Inami Wind Power Station Co. Inami Wind Power Station Hidaka County, Wakayama Prefecture 26,000 kW*2 Wind power (2,000 kW x 13 units) June 2018
Solar power generation and others
  Gas and Power Co., Ltd.
Torishima Solar Power Plant
Konohana Ward, Osaka City 1,800 kW*5 Solar power April 2013
Gas and Power Co., Ltd. Torishima Second Solar Power Plant Konohana Ward, Osaka City 1,200 kW*5 Solar power January 2014
Gas and Power Co., Ltd.
Shoo Solar Power Plant
Katsuta County, Okayama Prefecture 900 kW*5 Solar power April 2013
Hirogawa Myojinyama Wind Farm Co., Ltd.
Hirogawa Myojinyama Wind Farm
Arida County, Wakayama Prefecture 800 kW*5 Solar power April 2013
Yura Wind Development Co.
Yura Solar Power Plants (North and South)
Hidaka County, Wakayama Prefecture 1,700 kW*5 Solar power December 2016
Nabari Kintetsu Gas Co., Ltd.
Yahata Solar Power Plant
Nabari City, Mie Prefecture 700 kW*5 Solar power September 2013
JGC Mirai Solar Co., Ltd. NISSAN Green Energy Farm in Oita Oita City, Oita Prefecture 26,500 kW*5*6 Solar power May 2013
OGCTS Co., Ltd. 6 plants 7,800 kW *5 Solar power and others
Energy Bank Japan Co., Ltd. 24 plants 33,000 kW *5 Solar power and others
Total domestic power generation capacity for electricity business 2,006,600 kW*7
*1 GTCC
Gas turbine combined-cycle power generation method
*2
Output capacity owned by our company: 95%
*3
Output capacity owned by our company: 14.5%
*4
Output capacity owned by our company: 99.8%
*5
Output capacity for solar power is measured in terms of solar power panels.
*6
Output capacity owned by our company: 49%
*7
Output capacity listed as ownership of our company in NISSAN Green Energy Farm in Oita, operated by JGC Mirai Solar Co., Ltd., is 13,000 kW and output capacity listed as ownership of our company in Matsusaka Woody Biomass Power Plant, operated by Biomass Power Technologies Inc., is 300 kW.

Overview of Senboku Natural Gas Power Plant

Environment-friendly Senboku Natural Gas Power Plant operating smoothly
Senboku Natural Gas Power Plant

Senboku Natural Gas Power Plant

In FY2010, Osaka Gas's natural gas power plant at the Senboku Natural Gas Power Plant, a core part of our power generation business, went into operation, with four turbines working at a total capacity of 1.109 million kW. The Senboku Natural Gas Power Plant uses natural gas for power generation, creating far less impact on the environment than using other fossil fuels such as oil and coal. Other features make this plant a cutting-edge facility with minimal environmental impact; for example, the use of the gas turbine combined cycle method, which has a high energy efficiency.

Adoption of a gas turbine combined-cycle power generation method

Under the gas turbine combined-cycle power generation system, natural gas is combusted in the gas turbine's combustor, and the combusted gas then turns the gas turbine to generate electricity. In addition, the heat of the gas turbine's exhaust gas creates steam in an exhaust heat recovery boiler that turns a steam turbine to generate electricity. This gas turbine combined-cycle power generation is thus able to attain high efficiency in producing power by recycling the heat of exhaust gas.

The Senboku Natural Gas Power Plant uses a 1,300℃-class gas turbine to achieve a high power generation rate of about 57% (Lower heating value (LHV) standard), helping conserve energy and reducing CO2 emissions.

Environmental assessment procedures are currently underway in line with the Environmental Impact Assessment Act for a new natural gas-based power generation project, tentatively called “Himeji Natural Gas Power Plant Project,” undertaken by Himeji Natural Gas Generation Co., a joint company between Osaka Gas and Idemitsu Kosan Co. The project plans to introduce the highly energy efficient gas turbine-combined cycle method.

Energy Efficiency of Gas Turbine Combined-Cycle Power Generation

Energy Efficiency of Gas Turbine Combined-Cycle Power Generation
Preventing air pollution

Because the Senboku Natural Gas Power Plant uses natural gas, its exhaust gas contains no sulfur oxides (SOx) or soot and dust. Although nitrogen oxides (NOx) are generated by the combustion of natural gas, they are minimized by the use of a low NOx burner, and those that are generated are further reduced by an exhaust NOx removal system.

Plant Specifications

Power generation system
Gas turbine combined cycle power generation
Generating capacity
Generating capacity (Senboku LNG terminal Ⅱ) (Senboku LNG terminal Ⅰ)
No. 1 turbine: 277,000 kW No. 3 turbine: 277,500 kW
No. 2 turbine: 277,000 kW No. 4 turbine: 277,500 kW
Total: 554,000 kW Total: 555,000 kW
Fuel Natural Gas
Environmental protection measures Low NOx burner, ammonia-based exhaust NOx removal system, discharged water processing system, etc.

Plant System Flowchart

Plant System Flowchart

● Use of existing infrastructure

The need for new facilities for the plant is being minimized by locating the plant on the site of the Senboku LNG Terminal, which is equipped with an infrastructure that includes fuel supply facilities.

● Remote operational surveillance system

Stable operation of the plant by a small workforce is achieved by development of an integrated operational monitoring system for controlling power generating facilities spanning two sites.

● Fuel

Use of natural gas (LNG) as the fuel for generating electricity means that no SOx or soot and dust are generated.

● Burner

The latest low NOx burners are used to reduce NOx emissions.

● Inlet air cooling system

Gas turbine intake air is cooled to limit the reduction in power output at high temperatures.

● Flue

Flue height is increased to reduce ground-level concentrations of NOx.

● NOx removal system

Inside the waste heat recovery boiler is an exhaust NOx removal system, which uses the dry ammonia catalytic reduction method to break the NOx content of combustion gas down into water and nitrogen and reduce the concentration of NOx in the exhaust gas.

● Cooling towers

No warm wastewater is discharged due to the use of a cooling tower system.

● Wastewater treatment system

Wastewater from the power plant is treated by a wastewater treatment system comprising coagulation sedimentation, filtration, activated carbon adsorption, and pH adjustment to reduce the impact on water systems.

Overview of Nagoya Power Plant and Second Nagoya Power Plant

Smooth operation of Nagoya Power Plant and Second Nagoya Power Plant contributes to the reduction of environmental impacts.
Nagoya Power Plant and Second Nagoya Power Plant

Nagoya Power Plant and Second Nagoya
Power Plant

Nagoya Power Plant (capacity: 149,000 kW) and Second Nagoya Power Plant (capacity: 110,000 kW) use mixed fuel, coal and woody biomass, to substantially reduce CO2 emissions. The plants are also equipped with the latest environmental conservation technology to reduce hazardous substances and noise.

Biomass-combined coal-fired power generation
Biomass fuel burned together with coal (white pellet)

Biomass fuel burned together with coal
(white pellet)

Nakayama Nagoya Joint Power Generation Co., Ltd., a Daigas Group company, has adopted a biomass-combined coal-fired power generation method at the Nagoya Power Plant (coal-fired plant) and the Second Nagoya Power Plant (coal-fired plant) to curb CO2 emissions. The method uses woody biomass in the base fuel of coal.

The fuel used at the Nagoya Power Plant (with a total output capacity of 149,000 kW) contains 5% woody biomass. The rate of woody biomass stands at 30% for the fuel used at the Second Nagoya Power Plant (with a total output capacity of 110,000 kW). The plants are operated jointly with the aim of increasing operational efficiency in power generation and coal transportation.

Preventing air pollution

The boilers at Nagoya Power Plant and Second Nagoya Power Plant are equipped with various flue-gas purifiers, such as a low NOx burner and denitration system to reduce NOx generation, an electrostatic precipitator to eliminate dust, and a desulfurizer system to reduce sulfur emissions.

Plant Specifications

Nagoya Power Plant Second Nagoya Power Plant
Power generation system Steam-power generation (using pulverized coal and subcritical pressure) Steam-power generation (using pulverized coal and subcritical pressure)
Generating capacity 149,000 kW 110,000 kW
Fuel Coal, woody biomass (5% mixture in energy ratio), and kerosene (auxiliary fuel) Coal, woody biomass (30% mixture in energy ratio), and kerosene (auxiliary fuel)
Environmental protection measures Low NOx burner, ammonia-based exhaust NOx removal system, electrostatic precipitator, flue-gas desulfurizer system using limestone-gypsum method, etc. Low NOx burner, ammonia-based exhaust NOx removal system, electrostatic precipitator, flue-gas desulfurizer system using limestone-gypsum method, etc.
Cooling system Cooling system using sea water Cooling system using industrial water

System Flow of Second Nagoya Power Plant

System flow of Second Nagoya Power Plant

● Fuel

Woody biomass is mixed with the base coal fuel to reduce CO2 emissions.

● NOx removal system

A flue-gas denitration system (using dry ammonia catalytic reduction method) is installed after the boiler to decompose NOx contained in exhaust gas to water and nitrogen and reduce the NOx concentration in flue gas.

● Electrostatic precipitator

An electrostatic precipitator is installed after the denitration system to eliminate dust in combustion gas.

● Desulfurizer system

A desulfurizer system (limestone-gypsum method) is installed after the electrostatic precipitator to eliminate sulfur emissions in combustion gas. Sulfur is recovered as a form of gypsum to be effectively recycled.

Introduction of Cogeneration-Based Electricity Sources

Energy-efficient natural gas cogeneration facilities are set up on the premises of a client plant. Electricity and heat (steam) generated using the cogeneration system are provided to client companies. The Daigas Group uses part of the electricity generated as electricity sources for its power business, which helps improve the cogeneration facility utilization rate, promotes efficient energy use and reduces CO2 emissions. Gas and Power Co., an Osaka Gas Group company, operates this type of facility at two locations—one at the Uji Energy Center for Unitika Ltd. and the other at the Settsu Energy Center for Kaneka Corp. Power output capacity is 66,800 kW at the Uji Energy Center and 17,460 kW at the Settsu Energy Center.

Efforts to Spread Renewable Energy Sources

The Daigas Group has contributed to reducing CO2 emissions by operating in Japan power facilities using renewable energy sources, such as wind power, solar power and biomass, with a combined output capacity of about 210,000 kW. In Wakayama Prefecture, Inami Wind Power Station Co. began operating the Inami Wind Power Station, a power plant with an output capacity of 26,000 kW, in June 2018.

In FY018, the Group participated in biomass-burning power generation projects in Ichihara City, Chiba Prefecture, and Matsusaka City, Mie Prefecture, as part of its efforts to further spread electricity generation from renewable energy sources.

Inami Wind Power Station in Inami Town, Hidaka County, Wakayama Prefecture

Inami Wind Power Station in Inami Town, Hidaka County, Wakayama Prefecture

Matsusaka Woody Biomass Power Plant in Matsusaka City, Mie Prefecture

Matsusaka Woody Biomass Power Plant in Matsusaka City, Mie Prefecture

Overseas power projects

Hallett 4 wind power project in the state of South Australia, Australia

Hallett 4 wind power project in the state of
South Australia, Australia

Our overseas IPP business includes investment in fossil-based power plants, wind power projects and solar power projects in North America and Australia. In 2017, we invested in the Shore Power Plant in New Jersey, the United States. (Operation is scheduled to start in March 2020.) This was followed by the investments in 2018 in the Clean Energy Power Plant in Connecticut, the United States, and the Fairview Power Plant in Pennsylvania, the United States. (Operation is set to start in March 2020.)

Power Generation Facilities Operated by the Daigas Group (Overseas Facilities for Power Generation)

Name of project Location Power generation
capacity
Power generation
method
When the project
began operating
Tenaska Gateway IPP Texas, USA 845,000 kW
(338,000 kW)
GTCC June 2004*1
Osaka Gas Power America*2 7 plants in USA 1,446,000 kW
(301,000 kW)*2
Different power generation method for each project December 2005*1
Marianas Energy IPP*2 Guam, USA 87,000 kW
(87,000 kW)*2
Diesel engine December 2005*1
Energy Infrastructure Investments*3 2 plants in Queensland, Australia 59,000 kW
(18,000 kW)
Gas engine December 2008*1
Hallett 4 Project South Australia, Australia 132,000 kW
(53,000 kW)
Wind power (2,100 kW × 63 units) June 2011
Shuweihat S2 power generation and water desalination project (IWPP)*4 Abu Dhabi 1.51 million kW
(151,000 kW)
GTCC October 2011
Aurora-based solar power generation project 9 plants in Ontario, Canada 101,000 kW*5
(51,000 kW)
Solar power February 2013-March 2014
St. Charles Natural Gas Power Generation Project Maryland, USA 725,000 kW
(181,000 kW)
GTCC February 2017
Shore Natural Gas Power Generation Project New Jersey, USA 725,000 kW
(145,000 kW)
GTCC March 2017*1
Clean Energy Natural Gas Power Generation Project Connecticut, USA 620,000 kW
(151,000 kW)
GTCC May 2018*1
Michigan Power Natural Gas Power Generation Project Michigan, USA 125,000 kW
(125,000 kW)
GTCC July 2018*1
Total overseas power generation capacity for electricity business 6,375,000 kW
(1.6 million kW)
*1
Years and months listed indicate the time when a business license was obtained.
*2
Marianas Energy IPP, a wholly owned subsidiary of Osaka Gas, owns a 50% concession for the project through Osaka Gas Power America. The figure listed in the table as ownership of Osaka Gas Power America excludes the ownership of Marianas Energy.
*3
Four gas pipelines, two gas-refining facilities, two power stations, two power transmission lines
*4
Water desalination capacity owned by Shuweihat S2: 10 million gallons / day
*5
Solar panel capacity

CSR of Daigas Group

President's Commitment
Management and CSR of the Daigas Group
Policies on CSR
Special Feature
Contribution to the Sustainable
Development Goals (SDGs)
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
Reporting

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
Policies on CSR
Special Feature
Contribution to the Sustainable Development Goals (SDGs)
Addressing Social Issues through Energy Services
Promote Efforts for Recognition, Understanding and Penetration of SDGs
Corporate Governance
Corporate Governance
Risk Management
CSR Management
Stakeholder Engagement
Dialogue and Cooperation with Stakeholders
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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
Materiality
Customer Health and Safety
Product and Service Labeling
Energy / Emissions
Effluents and Waste
Local Communities
Customer Privacy
Grievance Mechanisms
Supplier Assessment
CSR Charter Ⅰ
Creating Value for Customers
Index
CSR Indicator
Safety and Security 1: Procurement Stage
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Incorporating Customer Opinions
Proposing New Value
CSR Charter Ⅱ
Harmonizing with the Environment and Contributing to Realizing a Sustainable Society
Index
CSR Indicator
Environmental Management
Environmental Action Targets
Environmental Impact throughout the Daigas Group Value Chain
Risks and Opportunities Related to Climate Change
Method to Evaluate Effects of CO2 Emissions Reduction and Results
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Helping Customers' Efforts for Realizing a Low-Carbon Society
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CSR Charter Ⅳ
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Management Policy for Human Growth
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