Environmental Management: Indicators, Targets and Results

Aspects Determined as Materiality
  • Energy


  • Emissions


Principle and Outline

To reduce the environmental impact of its city gas business and other Group-wide business activities, the Daigas Group has set medium-term environmental targets in its Long-Term Management Vision 2030 and other plans and manages progress in achieving the targets.

The environmental targets the Group is striving for include those for CO2 emissions reduction, more widespread use of renewable energy, waste reduction and recycling, and the reduction of excavated soil for final disposal. We also annually calculate GHG emissions (a chief cause of climate change) from the activities throughout our Group’s value chain and use that data to advance our efforts to reduce GHG emissions.

CO2 Emissions Reductions Targets and Results Set in the Long-Term Management Vision 2030

Third-party verification completed Osaka Gas underwent a third-party review by Bureau Veritas Japan Co., Ltd.

The Long-Term Management Vision 2030, announced by the Daigas Group in March 2017, declares that the Group will further enhance ESG-conscious management and sets an environmental target of reducing its GHG emissions by a total of approximately 70 million t-CO2 during the period from FY2018 to FY2031. This target for avoided CO2 emissions was set based on an estimated total CO2 emissions reduction from the FY2017 level that the Daigas Group will achieve during the period between FY2018 and FY2031 by introducing highly energy-efficient equipment, low-carbon energy sources, etc. in its business activities from FY2018 onward.

The CO2 emissions reduction effect of the Group’s various measures was estimated by summing the products of the following multiplication: [the forecast quantities of highly energy-efficient equipment, low-carbon energy sources, etc. to be introduced] × [CO2 emissions reductions per unit quantity to be made by replacing the current equipment, energy sources, etc. with them]. This calculation method is based on that of calculating the CO2 emissions reduction shown in the Japanese government’s Plan for Global Warming Countermeasures (approved by the Cabinet in May 2016). In addition, based on the above concept, the marginal emission factor (average emission factor of thermal power sources) was used as the CO2 emission factor of purchased electricity. As shown by the graph below, the expansion of the Daigas Group’s business scale will naturally entail an increase in all Scope 1, Scope 2, and Scope 3 GHG emissions. However, the Group’s efforts to reduce CO2 emissions, including replacing the current energy sources and systems with low-carbon ones, will help reduce CO2 emissions from other companies’ operations and their value chains, contributing to society-wide CO2 emissions reduction.

For more details about the method of calculating avoided CO2 emissions, click the link below.

In January 2021, the Daigas Group formulated and announced the Daigas Group Carbon Neutral Vision, which expresses the Group’s determination to take on the challenge of achieving carbon neutrality by 2050. In March of the same year, the Group also announced its Medium-Term Management Plan 2023: Creating Value for a Sustainable Future. These have updated the targets set in the Long-Term Management Vision 2030, declaring that the Group will further accelerate its efforts to achieve low-carbon or decarbonized business operations.

FY2021 results

The new initiatives the Daigas Group implemented from FY2018 to FY2021 resulted in avoided CO2 emissions of approximately 5.6 million tons. Those initiatives included cryogenic power generation at LNG terminals, introduction of renewable power sources in Japan and highly energy-efficient thermal power generation both in Japan and abroad, introduction of fuel cells, gas air conditioning, highly energy-efficient water heaters, etc. for customer use, and domestic and overseas fuel shifts to natural gas. We will continue to introduce highly energy-efficient equipment, low-carbon energy sources, etc. into both our own and customers’ facilities to make active contributions to realizing a low-carbon society.

■ Contribute to Reducing CO2 Emissions in Society

Contribute to Reducing CO2 Emissions in Society

Participated in the "Keidanren Carbon Neutrality Action Plan” (formerly titled “Commitment to a Low Carbon Society”)

Recognizing that global warming is a global long-term issue to be solved, the Japan Business Federation (Keidanren) formulated a plan titled “Keidanren’s Commitment to a Low Carbon Society” in 2013 (revised in 2017), presenting a vision common to the Japanese industries of leveraging their technological prowess to play a central role in achieving the target of reducing global GHG emissions by half by 2050. This plan envisions that each member industry should work to reduce CO2 emissions from business activities and people’s lives in Japan by introducing the best available technologies (BAT) to the maximum and that aspiring initiatives to stop global warming should be actively encouraged abroad. The plan also sets targets for strategically developing innovative technologies that will help achieve a breakthrough for the reduction of CO2 emissions by half by 2050.

Among the industrial organizations participating in this plan, the Japan Gas Association and the Electricity Council for a Low-carbon Society have established their own action plans to achieve a low-carbon society in the city gas industry and the electricity industry, respectively. Osaka Gas, a member of both organizations, participates in those plans for both industries and promotes initiatives to address global warming (climate change).

In June 2021, this plan was renewed as the “Keidanren Carbon Neutrality Action Plan.” From now on, we will formulate a plan to achieve carbon neutrality by 2050 and promote initiatives to serve that purpose.

Environmental Management Indicator and Result

Third-party verification completed Osaka Gas underwent a third party verification by Bureau Veritas Japan Co., Ltd.

Monetary value of major environmental impacts

Osaka Gas has adopted environmental management efficiency as an indicator and uses it to continuously assess the progress of environmental management in an integrated manner. This indicator is intended to assess the environmental management of the Company’s gas business, separately from its power generation and other businesses.

The indicator is designed to quantify the environmental impact of the Company’s business activities by converting the value per unit gas production of each of the various forms of the impact (GHG emissions, NOx emissions, COD, the amount of general and industrial waste for final disposal, the amount of excavated soil for final disposal, and the amount of chemical waste) and water consumption (for general and industrial use) into monetary values and summing up those values (yen/1,000 m3).

■ [Legend] Environmental Impacts

[Legend] Environmental impacts

■ Environmental Management Efficiency ( yen / 1000 m³ )

Environmental Management Efficiency ( yen / 1000 m³ )

Management indicators and results

  • The value of the environmental management efficiency for FY2021 was 14.0 yen/1,000 m³. A decline in city gas production output mainly due to the COVID-19 pandemic caused a decrease in the operation of the cryogenic power generation facilities at our LNG terminals and a resulting increase in electricity purchased from outside. As a result, our value of environmental management efficiency increased from the previous fiscal year but almost achieved the initial target. In FY2018, the monetary conversion coefficient was updated to its latest value used in the life-cycle impact assessment method based on endpoint modeling (LIME).

  • ■ Environmental Management Efficiency

    Environmental Management Efficiency

■ Environmental Management Efficiency Results

FY 2017 2018 2019 2020 2021
Environmental impact CO2 emissions (Tons)*1 130,006 122,848 125,396 133,678 134,987
CH4 emissions (Tons) 75 77 77 106 58
Final disposal of excavated soil (Tons)*2 9,699 2,978 2,285 1,900 1,954
Final disposal of general waste (Tons) 17 11 11 11 15
Final disposal of industrial waste (Tons) 237 236 235 238 264
NOx emissions (Tons) 8.08 10.94 11.84 12.4 12.14
COD emissions (Tons) 2.55 2.14 2 2.38 2.87
Toluene emissions (Tons) 0.03 0.02 0 0.01 0
Xylene emissions (Tons) 0.94 0.68 0.04 0.38 0
Water consumption (general and industrial water) (10,000 m³) 117 110 124 104 109
Monetary value of environmental impact (Million yen) 455 102 101 102 102
Amount of gas produced (Million m³ )*3 8,662 8,772 8,142 7,464 7,280
Environmental Management Efficiency (yen / 1,000 m³ )*4 52.5 11.6
  • *1 CO2 emissions
    The CO2 emission coefficient for purchased electricity used to calculate environmental management efficiency was 0.69 kg-CO2/kWh until FY2017 and 0.65 kg-CO2/kWh for FY2018 and FY2019.
  • *2 Excavated soil for final disposal
    The values shown in the “FY2008 Construction Byproduct Survey Report (Kansai Region)” were used for up until FY2017, and the values shown in the “FY2012 Construction Byproduct Survey Report (Kansai Region)” have been used for FY2018 and subsequent years.
  • *3 Amount of gas produced
    Use the amount of gas sold until FY2017
  • *4 Environmental management efficiency
    The figures for FY2018 through FY2021 shown in parentheses represent the figures that would have been calculated under the calculation formula used until FY2017.

Environmental Targets and Results

Third-party verification completed Osaka Gas underwent a third party verification by Bureau Veritas Japan Co., Ltd.

Our major environmental targets for FY2021, including that for environmental management efficiency as an integrated indicator, were achieved mainly due to the operation of the cryogenic power generation facilities at our terminals, progress in the reuse of excavated soil, and energy-saving activities, including replacing existing lights in offices with LED light.

■ Environmental Targets (FY2021 Targets) and Results

Field Indicators Targets for FY2021 FY2021 results
Integrated indicator Environmental Management Efficiency Environmental impact of gas business per gas produced
(Monetary value (yen) of GHG, excavated soil, waste, NOx, COD, chemical substances, water consumption / gas produced (1,000 m³ ) )

14.2 or less
(−22% compared to FY2009)


Low-carbon society Reducing CO2 emissions from our business activities City gas business LNG terminals
(CO2 emissions per 1 million m³ of gas produced) (t-CO2 / 1 million m³ )

(−12% compared to FY2009)


Office buildings
(CO2 emissions per 1000 m² floor space)

(−27% compared to FY2009)


Group companies' businesses*1 Electricity business
(including renewable energy sources) (CO2 emissions per electricity generated)

compared to FY2009


Other businesses
(CO2 emissions per sales) (t-CO2 / 10 million yen)

(−12% compared to FY2009)


Reducing CO2 emissions on customer sites and throughout the value chain Customers

Centered on natural gas, Osaka Gas aims to reduce greenhouse gas emissions by diffusing energy-efficient value-added products.

  • •Diffusion and expansion of energy-efficient fuel cells (for residential and commercial use)
  • •Promotion of fuel cells (for residential use) as a low-carbon electric source through the active purchase of redundant household-produced electricity derived from fuel cells
  • •Diffusion and expansion of appliances deemed effective in saving and creating energy in a zero energy house (ZEH), a smart house whose net energy consumption is zero (through the use of fuel cells, solar power generation systems, and energy-efficient water heaters)
  • •Promotion of natural gas as a low-carbon energy source, and the diffusion and expansion of energy-efficient cogeneration systems and gas air-conditioners to reduce peak electricity demand
  • •Diffusion and expansion of the ICT energy management system through the addition of advanced functions
  • •Use of solar and wind power systems, biomass and renewable energy sources
  • •Diffusion and expansion of natural gas through retail sales across broad areas of Japan and overseas, and energy services
  • •Sold a total of 140,000 units of the Ene-Farm fuel cell system for residential use
  • •Daigas Energy Co., Ltd. started providing D-Solar, a self-consumption solar power generation service, in June.
  • •Put into operation the Fukushima Natural Gas Power Plant (1.18 million kW) in Soma City, Fukushima Prefecture
  • •Participated in the Three Rivers natural gas-fueled thermal power generation project (1.25 million kW) under development in Illinois, U.S.
  • •Decided to commercialize a biomass power plant in Tahara City, Aichi Prefecture, and put into commercial operation a biomass power plant in Ichihara City, Chiba Prefecture
  • •Made joint investment in an onshore wind power generation business (36,000 kW) in Aomori Prefecture
  • •Signed a bilateral contract with West Holdings Corporation to procure 200,000 kW of electricity and environmental value from new small-scale solar power generation facilities for the long term
  • •Participated in a fuel switching business at food plants in Vietnam
Transportation / logistics
  • •Reduction of environmental impact through the efficient operation of eight LNG tankers currently under the management of Osaka Gas
  • •Efforts to spread natural gas-powered vehicles centering on large-sized trucks used by Group companies and business partners in the shipping and distribution businesses
  • •Realized efficient LNG transportation through fixed-speed operation of LNG carriers
  • •Introduced one large CNG truck
Emissions reduction for entire Group CO2 (t-CO2)
(including contribution to reductions at customer sites and overseas)

7 million

Cumulative total: 5.6 million

Resource recycling Promoting the 3Rs in our business Gas business Industrial waste from LNG terminals (final disposal rate)

1% or less*2


ndustrial waste from facilities other than LNG terminals (final disposal rate)

1% or less


General waste (final disposal rate)

3% or less


Excavated soil (final disposal rate)

1% or less


Polyethylene (PE) pipes (recycling rate)



Gas meters (reuse rates)

98% or more


Group companies*1 Industrial waste / general waste (final disposal rate)

4% or less


Efforts throughout the value chain
  • ・Promote the 3Rs of used equipment at our customers, in cooperation with our business partners (residential gas equipment, alarms, packing materials, renovation waste, PCs, commercial/industrial equipment, etc.)
  • • Redesigned and firmly established a system for appropriate disposal of used water heaters
  • ・We will take biodiversity into account in conducting business in accordance with the Daigas Group Biodiversity Promotion Policy. (LNG terminals, business offices and real estate properties managed by Group companies)
  • • Managed green spaces on LNG terminal sites in a biodiversity-conscious way and conducted a monitoring survey thereof
  • • Began to plant native seedlings and the like on collective housing sites in urban development projects (development and operation of condominiums for sale and rental apartments) Received the Good Design Award and obtained ABINC certification for a condominium
  • • Continuously worked to expand habitats for native plant species using native seedlings growing in green spaces on Group land
Technology development Promotion of technological development to help create a low-carbon society and further solidify the Company's already solid business foundation
  • •Efforts to develop more energy-efficient fuel cells, cogeneration systems and gas air-conditioners
  • •Development of demand response control technologies to contribute to the trading of saved electricity
  • •Development of reasonably priced and energy-efficient hydrogen-generating equipment to be installed at hydrogen-filling stations
  • •Development of environmental technologies that can spur the environmental equipment market, such as technologies that can lead to new products and those that can expand application fields
  • •Launched a research and development initiative, in collaboration with the Japan Coal Energy Center, to simultaneously produce hydrogen, electric power, and CO2 using chemical looping combustion technology that contributes to decarbonization
  • •Succeeded for the first time in Japan in prototyping a new practical-size SOEC, which will be the key to realizing innovative methanation, a promising technology for city gas decarbonization
  • •Started a verification project to establish a virtual power plant (VPP) using Ene-Farm, a fuel cell system for residential use
Green procurement / purchasing
  • •Promote green purchase in cooperation with clients and a green partnership system
  • •Expanded green purchasing items and renewed green partner agreements
  • *1 Among the 154 consolidated subsidiaries, 56 other than those that are tenants, on which data is hard to obtain and which have a minor environmental impact, or overseas subsidiaries
  • *2 Excluding industrial waste related to PCB disposal The applicable law requires that PCB disposal be completed by 2027.

[Major changes in the method of calculating the target values from FY2018]

  • •With regard to indicators for Environmental Management Efficiency and CO2 reductions in city gas production sites, the denominator used in the calculation formula was switched from the amount of gas sold to the amount of gas produced in light of city gas production and procurement realities.
  • •The Environmental Management Efficiency monetary value conversion coefficient was updated to reflect the latest available figures used in the life-cycle impact assessment method (LIME).

■ Environmental Targets (FY2024 Targets)

Field Item Target Target year
Group’s CO2 emissions Net-zero CO2 emissions FY2051
Climate change Reduction of CO2 emissions from the Group’s own business activities Percentage of renewables in our power generation portfolio in Japan Nearly 50% FY2031
Contribution to developing renewables capacity on a global basis 5 million kW FY2031
2.5 million kW FY2024
Reduction of CO2 emissions from customers’ activities and their value chains
  • •Accelerating decarbonization by facilitating more widespread use of highly energy-efficient and high-value-added equipment using natural gas, renewable energy, etc.
  • •Operating LNG carriers efficiently and increasing the use of low-emission and other environmentally sustainable vehicles
  • •Providing environmental value by disseminating high-quality solutions in the fields of information, real estate, and materials
Every year until FY2031
Contribution to CO2 emissions reduction in society as a whole Avoided CO2 emissions (t-CO2)
(including avoided CO2 emissions from customers’ activities and abroad)
10 million t-CO2
(from FY2017)
Resource recycling 3R (reduce, reuse, and recycle) efforts in the Group’s own business activities Osaka Gas (including the core energy business companies) Industrial and general waste (final disposal rate) 2% or below Every year until FY2031
Soil excavated during piping works (final disposal rate) 1% or below
PE pipes (recycling rate) 100%
Gas meters (reuse rate) 98% or above
Affiliate companies Industrial and general waste (final disposal rate) 4% or below
Efforts in the value chain
  • Promoting 3R efforts concerning used equipment collected from customers or business activities
  • Paying due attention to biodiversity in business activities in line with the Daigas Group Biodiversity Promotion Policy
Every year until FY2031
R & D
  • Facilitating the development of technologies that will contribute to realizing a low-carbon or decarbonized society and provide a strong business foundation
Every year until FY2031
Green procurement and purchase
  • Promoting green purchase, the green partner system, etc. in cooperation with business partners
Every year until FY2031

Environmental Impact throughout the Daigas Group Value Chain (FY2021)

Third-party verification completed Osaka Gas underwent a third party verification by Bureau Veritas Japan Co., Ltd.

The Daigas Group calculated GHG emissions from its entire value chain in accordance with guidance given by the GHG Protocol, which provides international standards for GHG emissions reduction. The calculation method and results have been verified in terms of reliability and accuracy by a third-party organization. *

The calculation has revealed that in FY2021, the total GHG emissions were approximately 27.78 million tons-CO2, of which approximately 5.51 million tons-CO2 (about 18%) was Scope 1 and Scope 2 emissions from the Group’s own business activities, and approximately 22.27 million tons-CO2 (about 80%) was Scope 3 emissions from other parties throughout the Group’s value chain. City gas combustion at customers’ sites accounted for about 59% (16.39 million tons-CO2) of the total GHG emissions. This indicates that facilitating CO2 emissions reduction in society as a whole requires us to further promote energy conservation using natural gas with low CO2 emissions and encourage more widespread use of highly energy-efficient equipment and systems, including Ene-Farm and cogeneration systems.

Meanwhile, among our own business activities, the power generation business accounted for about 18% (5.05 million tons-CO2) of the total GHG emissions. While the percentage has risen as our power generation business has expended, we will continue our efforts to reduce our GHG emissions by introducing the most advanced highly energy-efficient power generation facilities and renewable energies as power generation sources.
Also, material and fuel procurement accounted for about 18% (5.03 million tons-CO2), over 70% of which was from the procurement of LNG and other energy sources. We will continue collaborating with suppliers in GHG emissions reduction and working to enhance the fuel efficiency of carriers.

In addition to GHG emissions, various forms of the environmental impact include general and industrial waste, and excavated soil, used polyethylene (PE) pipes, and other scraps from gas piping works. We have recycled a high percentage of these kinds of waste and will strive to maintain the current level. About 97% of water used for our business activities is taken from the sea. Seawater is mainly used to gasify LNG at our LNG terminals or as coolant in steam turbine condensers at some power plants. Once used, water is discharged under appropriate management, instead of being consumed.

■ GHG Emissions from the Value Chain (FY2021 Results)

GHG Emissions from the Value Chain (FY2021 Results)

LCA comparison of GHG emissions by fossil fuel (CO2 equivalents)

The chart below uses life cycle assessment (LCA*1) to show a comparison of fossil fuel greenhouse gas emissions (as carbon dioxide equivalents), covering all processes from production to combustion. LNG is the cleanest energy of all fossil fuels in terms of GHG emissions.

■ Greenhouse Gas Emissions Comparison (g-CO2/MJ, Total Calorific Value)

Coal*2 Oil*2 LPG*2 LNG*2 City Gas 13A*3












Domestic manufacturing





























  • *1 LCA
    Life Cycle Assessment.A comprehensive quantitative method of survey, analysis, and evaluation for best assessing the amount of environmental impact of products and services. The assessment covers all processes related to products and services from resource extraction to waste disposal including production, transportation, consumption, recycling, and disposal
  • *2 Source
    Future Forecast for Life Cycle Greenhouse Gas Emissions of LNG and City Gas 13A (Energy and Resources, Vol. 28, No. 2, March, 2007)
  • *3 Source
    Emission factors related to the production and transportation of city gas:“City Gas’s Life Cycle Assessment” on the Japan Gas Association’s website

Environmental Accounting

Increase in environmental investment and expenses

In FY2001, we introduced environmental accounting, which we see as an important tool for quantifying environmental costs and economic benefits toward more efficient environmental activities and continuous enhancement of our environmental performance.

Environmental conservation costs—the aggregate of environmental investment and expenses—for FY2021 decreased from the previous fiscal year mainly due to a decline in capital investment in pollution prevention and a decrease in purchase expenses for piping materials, printing, and office equipment. Internal economic benefits increased from the previous fiscal year due to progress in cost reduction efforts through energy and resource saving.

We will continue to follow up on our environmental initiatives in monetary terms to ensure efficient environmental investment and expenses.

■ (1) Environmental Conservation Costs

Environmental Conservation Costs Item Investment
(million yen)
(million yen)
Details 2018 2019 2020 2018 2019 2020
In-house activities Global environment Capital investment in and management and labor costs incurred by energy conservation, efficient energy use, the protection of the ozone layer, etc.







Pollution prevention Capital investment in and management and labor costs incurred by the prevention of air, water, and noise pollution







Resource recycling Capital investment in and management and labor costs incurred by the reduction and recycling of excavated soil, waste management, etc.







Environmental management Costs of green purchasing, environmental education, the development of environmental management systems (EMSs), the operation of environmental organizations, etc.







Other Greening at plants, environmental preservation grants, etc.







Environmental impact reduction at customers’ sites Environmental R&D Cost of researching and developing technologies for environmental impact reduction, environmentally sustainable products, etc.







Environmental impact reduction by recycling Recycling of used gas appliances Cost of collecting and recycling sold gas appliances, their packaging, etc.







Social contribution activities Costs of voluntary greening, environmental advertising, the disclosure of environmental information, etc.














■ (2) Internal Economic Benefits

Economic benefits (million yen)
2018 2019 2020
Saving from reducing and recycling excavated soil




Sales of valuable resources (LNG cold heat)




Saving from conserving energy, resources, etc.








■ (3) Environmental Conservation Results

Impact per output Total amount Reduction
Unit 2019 2020 Unit 2019 2020 Unit 2019 2020
NOx emissions from LNG terminals in the city gas business mg/m³ 0.78 1.66 t 5.72 12.14 t 47.46 47.76
COD at all LNG terminals mg/m³ 0.33 0.40 t 2.38 2.87 t 8.68 9.30
CO2 emissions from LNG terminals g-CO2
13.64 14.60 1,000
99.90 103.98 1,000
11.94 4.76
CO2emissions from other sites g-CO2
5.28 4.48 1,000
38.66 31.01 1,000
28.43 33.31
Excavated soil for final disposal t/km 9.36 4.24 1,000
4.53 2.02 1,000
45.85 44.90
General waste for disposal g/m³ 0.00 0.00 t 10.97 12.02 t 1,087.63 1,056.13
Industrial waste for disposal
(including used gas appliances)
g/m³ 0.03 0.03 t 238.54 236.10 t 4,741.78 4,606.18

■ (4) Social Benefits of Environmental Conservation Efforts (Monetary Value)

FY2019 monetary value
(million yen)

FY2020 monetary value
(million yen)

FY2021 monetary value
(million yen)

NOx emissions from LNG terminals in the city gas business




COD at all LNG terminals




CO2emissions from LNG terminals




CO2emissions from other sites




Excavated soil for final disposal




General waste for disposal




Industrial waste for disposal (including used gas appliances)








Estimation method of environmental accounting

1. The standards incorporated

Osaka Gas's environmental accounting method, which calculates costs and benefits, is based on the 2000 version of The Environmental Accounting Guidelines For Gas Utilities released by the Japan Gas Association. The guidelines are based on the Ministry of the Environment's Creating an Environmental Accounting System guidelines and reflect the distinctive characteristics of city gas companies.

2. Scope

Osaka Gas Co., Ltd.

3. Period

April 1, 2020 - March 31, 2021
In order to improve the accuracy of environmental accounting as well as reduce the workload, Osaka Gas developed and operates a system tied to the in-house financial accounting system since FY 2001.

Calculation of environmental costs and benefits

(1) Environmental conservation costs

The aggregate figures for each item are compiled as far as possible using only costs incurred for environmental purposes (differential aggregation). R&D and personnel costs from which it is difficult to extract only those costs incurred for environmental purposes are calculated on a pro rata basis using an “environmental ratio” determined in accordance with their degree of connection to the environment.
Investment: aggregate of the fixed assets acquired in the fiscal year in question that contribute to environmental improvements
Costs: aggregate of depreciation costs, labor costs and expenditures for environmental efforts
Depreciation of fixed assets acquired since 1997 (including terminals and other large-scale facilities acquired prior to that) is calculated via the declining balance method over the useful life of the equipment. Labor costs are calculated using standard unit costs.

(2) Internal economic benefits

The benefits accrued from cutting expenses that can be clearly reduced based on the company's operational performance were aggregated.

(3) Economic conservation effects (material effects)

The environmental impact level, the total environmental impact, and the environmental impact mitigation level are calculated.

  • ・Environmental impact level
    NOx, COD, CO2, general waste, and industrial waste figures are calculated per cubic meter of gas sold. Final disposal volumes for surplus soil are calculated per km of gas pipes installed.
  • ・Total environmental impact
  • ・Environmental impact reduction
    For NOx and COD, the difference from the stipulated value for each facility is posted. For CO2, general waste and industrial waste, figures are calculated by multiplying the differences in output units (amounts per cubic meter of gas sold) from the benchmark FY1998 levels by the volume sold that fiscal year. For final disposal of excavated soil, the reduction in offshore landfill disposal was calculated based on the amount of reduction in excavated soil and the amount of soil recycled.

(4) Social benefits of environmental conservation (monetary value)

The monetary values of social benefits derived from reducing environmental impact were calculated. For final disposal of excavated soil, the monetary values of social benefits stemming from environmental conservation are calculated by multiplying the base unit price determined through the contingent valuation method (CVM; a method in which residents are surveyed on the amounts they are willing to pay for environmental conservation and then the monetary value of this conservation is calculated) by the reduction in environment impact.
Base units were also selected for other environmental impacts corresponding to the amount of environmental value on the basis of research on environmental damage costs, etc., both inside and outside Japan, and then the environmental conservation benefits were calculated by multiplying these base units by the respective amounts of harmful impacts curbed.

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