Environmental Data

Environmental Data (FY2023)

Environmental Data

Independent Assurance

TAISEI CORPORATION Annual Environmental Targets

Environmental Targets for FY2024
  Annual Targets FY2024
(Medium-Term Business Plan
2024-2026)
Decarbonized
Society
 Scope1+2
Reduction of CO2 emissions per sales 		-13% (compared to FY2022)
Scope1+2

Reduction of total CO2 emissions
-1% (compared to FY2022)
At building operation stage: Reduction for design-build projects estimated CO2 emissions
 -6% (compared to FY2022)
Rate of ZEB for design-build projects
(Dimension ratio)
 50%
Recycling Oriented
Society
 Number of green procurement items adapted at building construction design stage 12 items or more / project
Reduction of final disposal rate of
construction waste
 3.0% or less
Nature Co-Existing
Society
Promotion of projects that contribute to
nature positive
 50 projects or more
  •  Key Performance Indicator
Environmental Targets and Results for FY2023
  Annual Targets FY2023
Targets Results
Decarbonized
Society
 At construction stage*1:
Reduction of CO2 emissions per sales◎		 -41% -45.2%
At construction stage*1:
Reduction of total CO2 emissions◎		 -46% -57.1%
At building operation stage*1：
Reduction for design-build projects estimated CO2 emissions (including dissemination and promotion of ZEB)◎		 -43% -46.6%
Recycling Oriented
Society
 Adoption of green (environmentally conscious) procurement items at building design stage 12 items or more per PJ 13.7 items / PJ
Reduction of final disposal rate of construction waste 3.2% or less 2.9%
Nature Co-Existing
Society
 Promotion of projects contributing to improvement in biodiversity 40PJ or more 44PJ
  • *1Compared to FY1990

◎KPIs for Medium-Term Business Plan (2021-2023)



TAISEI Group Material Flow (FY2023)

INPUT
Total fossil fuel use 78.2 103kL
Diesel 60.1
Kerosene 2.8
Heavy oil 13.6
Gasoline 1.7
Total electricity use 159 106kWh
Sites
(construction sites)		 105
Factories 32
Offices 23
Total quantity of the main construction materials — —
Ready mixed concrete 1,012 103m3
Cement 52 103t
Aggregates (gravel, crushed stone, etc.) 123 103t
Steel 421 103t
Water (consumption) 2,103 103m3
OUTPUT
Total CO2 emissions
(Scope1+2)		 283 103t-CO2
Sites
(construction sites)		 213
Factories 56
Offices 14
Scope 1 218 103t-CO2
Scope 2 66
Construction by-products volume 2,806 103t
Quantity recycled 2,699
Quantity of direct final disposal 107
Water (discharged) 4,021 103m3
Supply chain CO2 emissions
(Scope3)
Scope 3 5,642 103t-CO2
Category 1 1,655
Category 11 3,632
Other Categories 355
Total CO2 emissions (Scope1+2)
Taisei Corporation 202 103t-CO2
Taisei Rotec Corporation 75
TAISEI U-LEC CO., LTD. 4
Five other companies 3
Construction By-product volume
Taisei Corporation 2,434 103t
Taisei Rotec Corporation 305
TAISEI U-LEC CO., LTD. 46
Five other companies 21

TAISEI CORPORATION Material Flow

INPUT

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Total energy use 109MJ 4.39 3.60 3.77 3.24 3.26
Construction site
(building)		 109MJ 1.99 1.04 1.45 1.32 1.04
Construction site
(civil engineering)		 109MJ 2.18 2.35 2.10 1.70 2.03
Offices 109MJ 0.22 0.22 0.22 0.22 0.19
Total fossil fuel use 103kL 76.7 61.4 62.7 50.9 57.2
Diesel 103kL 75.2 60.0 62.2 45.1 51.7
Kerosene 103kL 0.6 0.9 0.5 0.9 0.7
Heavy oil 103kL 1.0 0.5 0.1 5.0 4.8
Total electricity use*1 106kWh 145 122 136 125 120
Construction site (building) 106kWh 57 21 34 49 37
Construction site
(civil engineering)		 106kWh 73 87 85 59 67
Offices 106kWh 15 15 16 16 17
City gas (offices) 103m3 213 259 165 118 46
GTL 103kL — — — 0.3 0.0
Quantity of the main construction materials*2
Ready mixed concrete*3 103m3 4,066
(103t)		 3,855
(103t)		 1,523 1,060 1,012
Cement 103t 263 172 120 66 52
Aggregates (gravel, crushed stone, etc.) 103t 2,514 387 315 155 123
Steel 103t 506 534 539 405 421
Water (consumption)*4 103m3 1,414 1,412 2,266 2,279 2,012
Construction site 103m3 1,348 1,363 2,215 2,220 1,950
Offices 103m3 66 49 51 59 62
Proportion by worksites water intake destination*5
Tap water / water for industrial use % 82 67 22 57 91
River water / groundwater / etc. % 18 33 78 43 9
Seawater % 0 0 0 0 0
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
  • *1Portion of renewable energy (power purchase、self-generating、purchasing non-fossil certificates) of total electricity use is 6GWh (5％)
  • *2Until FY 2020, the contract quantities were tabulated. From FY2021, sales quantities for the four main construction materials (ready-mixed concrete, cement, aggregates, and steel) were tabulated. From FY2022, sales quantities for Taisei Corporation's independent construction projects and turnover quantities for joint venture constructions according to Taisei’s equity interest were tabulated, calculated, and disclosed.
  • *3From FY 2018 through FY 2020, quantities have been shown as “103t”.
  • *4Consumption ＝ Intake quantity. The discrepancy between the consumption quantity and the discharge quantity is mainly due to the fact that naturally gushed out spring water, ground water, etc., at the worksites are not included in the consumption quantity, but are included in discharge quantity as they are subject to management.
  • *5Proportion calculated from intake quantities at sampled worksites.
OUTPUT

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Total CO2 emissions (Scope1+2) 103t-CO2 267 216 224 189 202
Construction site
(building)		 103t-CO2 124 66 91 78 64
Construction site
(civil engineering)		 103t-CO2 133 140 123 101 129
Offices 103t-CO2 10 10 10 10 9
At construction stage:
CO2 emissions per sales		 t-CO2 / JPY 100 million 18.8 19.1 19.1 14.4 15.0
Total CO2 emissions 103t-CO2 267 216 224 189 202
Scope1*1 103t-CO2 198 159 162 133 151
Scope2 103t-CO2 69 57 61 56 51
NOX t 1,302 1,039 1,085 813 934
SOX t 200 158 162 151 168
Quantity of Fluorocarbon and Halon recovered*2 t 21 — — — —
Construction by-products 103t 2,411 1,787 1,976 2,012 2,434
Quantity recycled 103t 2,283 1,715 1,914 1,939 2,338
Quantity of direct final disposal 103t 128 71 62 73 96
Water (discharged)*3 103m3 4,288 6,625 9,677 3,014 3,948
Construction site 103m3 4,228 6,578 9,627 2,955 3,886
Offices 103m3 60 47 50 59 62
Proportion by worksite discharge destination*4
Sewer, etc. % 34 19 11 66 95
River / lake / agricultural drainage ditch % 65 77 89 33 5
Ocean % 1 4 0 1 0
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
  • *1Since in FY2021, in accordance with the Japan Federation of Construction Contractors guidelines, emissions at Taisei worksites from fuel are listed under Scope 3 until FY2020 were included in Scope 1.
  • *2Until FY2019, the recovery quantities of fluorocarbons and halons have been tabulated, and disclosed (the recovery quantity of halons have been included until FY2018) in accordance with the Fluorocarbons Recovery and Destruction Act.
    In FY2020, leak quantities were tabulated in accordance with the Act for Rationalized Use and Proper Management of Fluorocarbons. Negligible leak quantities are not disclosed.
  • *3The discrepancy between the consumption quantity and the discharge quantity is mainly due to the fact that naturally gushed out spring water, ground water, etc., at the worksites are not included in the consumption quantity, but are included in discharge quantity as they are subject to management.
  • *4Proportion calculated from intake and discharge quantities at sampled worksite.
Supply Chain CO2 Emissions (Scope3)

Third-party assured values are indicated with the mark

Category Unit FY2019 FY2020 FY2021 FY2022 FY2023
Total CO2 emissions (Scope3) 103t-CO2 — 4,991 3,878 4,616 5,001
1. Purchased goods and services*1 103t-CO2 — 1,347 1,283 1,889 1,455
2. Capital goods 103t-CO2 — 4 0 13 5
3. Fuel-and energy-related activities not included in Scope 1 or Scope2 103t-CO2 — 32 33 28 25
4. Upstream transportation and distribution 103t-CO2 — 9 8 5 5
5. Waste generated in operations 103t-CO2 — 179 209 143 206
6. Business travel 103t-CO2 — 1 1 1 1
7. Employee commuting 103t-CO2 — 5 5 5 5
8. Upstream leased assets 103t-CO2 — 1 0 0 0
9. Downstream transportation and distribution 103t-CO2 — — — — —
10. Processing of sold products 103t-CO2 — — — — —
11. Use of sold products*2 103t-CO2 — 3,371 2,284 2,495 3,262
12. End of life treatment of sold products 103t-CO2 — 40 51 35 34
13. Downstream leased assets 103t-CO2 — 5 5 3 2
14. Franchises 103t-CO2 — — — — —
15. Investments 103t-CO2 — — — — —
  • *From FY2020 emissions, values based on the GHG Protocol, etc. are disclosed.
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
  • *1Category 1

    (1)For FY2020 and FY2021, the CO2 emissions for the four main construction materials (ready-mixed concrete, cement, aggregates, and steel) were calculated. From FY2022, those for all items were calculated. Calculated using the emission factors in the basic guidelines for calculation of greenhouse gas emissions throughout the supply chain (LCI database IDEAv2 (for calculation of supply chain greenhouse gas emissions)), until FY2022. From 2023, calculated using IDEAv3.3 and the emission factors of the figures that announced by Japan Cement Association LCI and Japan Society of Civil Engineers by environmentally friendly building materials. The calculation takes reduction effect of adopting the environmentally friendly building materials into consideration.
    (2)FY2023 emissions using the calculation until FY2022 is 1,859×103t-CO2, and the discrepancy between the calculations is in reduction of 404×103t-CO2.
    (3)FY2022 emissions using the same calculation as the one in FY2023 is 1,506×103t-CO2 (Third-party assurance has not acquired). This FY2022 emissions is used as the base year emissions in TAISEI Green Target 2050.

  • *2Category 11

    (1)Emission factor by building-purposes that calculated by emissions by floor area of projected CO2 emissions at the operational stage of 1990 standard is used until FY2022.
    From FY2023, the BELS-certified projects are included in order that ZEB results be reflected in the category. Furthermore, to allow reduction effect through in-house effort to be reflected in the category, emission factor by building-purposes that calculated by emissions by floor area of projected CO2 emissions at the operational stage of 2022 standard was calculated using nationwide statistics of the standard primary energy consumption in the Act on the Rational Use of Energy as the standard primary energy.
    (2)FY2023 emissions using the calculation until FY2022 is 1,913×103t-CO2, and the discrepancy between the calculations is in increase of 1,349×103t-CO2.
    (3)FY2022 emissions using the same calculation as the one in FY2023 is 4,628×103t-CO2(Third-party assurance has not acquired). This FY2022 emissions is used as the base year emissions in TAISEI Green Target 2050.

Material Flow for Group Companies

INPUT

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Total energy use 109MJ 1.68 1.70 1.70 1.70 1.35
Sites
(Construction site)		 109MJ 0.32 0.37 0.42 0.47 0.29
Factories 109MJ 1.23 1.20 1.15 1.12 0.96
Offices 109MJ 0.12 0.13 0.12 0.12 0.09
Total fossil fuel use 103kL 26 27 27.4 26.7 20.9
Diesel 103kL 10 11 12.2 13.2 8.5
Kerosene 103kL 3 3 2.7 2.5 2.1
Heavy oil 103kL 11 11 10.8 9.0 8.8
Gasoline 103kL 2 2 1.7 1.9 1.7
Total electricity use 106kWh 43 43 43 42 39
Sites
(Construction site)		 106kWh 1 1 1 1 1
Factories 106kWh 35 35 35 35 32
Offices 106kWh 7 7 7 7 6
City gas 103m3 5,692 5,056 4,169 4,589 4,035
GTL 103kL — 0 0.2 0.1 0.0
LPG t 485 575 598 1,231 1,115
Water (consumption) 103m3 138 109 102 111 91
  • *Note: Data are from TAISEI Group Company is excluding TAISEI COPORATION (domestic).
OUTPUT

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Total CO2 emissions (Scope1+2) 103t-CO2 101 102 101 102 81
Construction site 103t-CO2 22 25 29 32 20
Factories 103t-CO2 72 70 66 64 56
Offices 103t-CO2 7 7 6 6 5
Total CO2 emissions 103t-CO2 101 102 101 102 81
Scope1*1 103t-CO2 81 83 83 84 67
Scope2 103t-CO2 20 19 18 19 14
NOX t 227 224 280 295 210
SOX t 103 105 107 97 83
Quantity of Fluorocarbons and Halon leaked*2 t 2 2 6 6 —
Total industrial waste generated 103t 485 416 476 408 372
Quantity recycled 103t 475 406 465 397 361
Final disposal quantity 103t 10 10 11 12 11
Water (discharged) 103m3 74 76 108 120 73
  • *Note: Data are from TAISEI Group companies is excluding TAISEI COPORATION (domestic).
  • *1From FY2021, in accordance with the Japan Federation of Construction Contractors guidelines, emissions at Taisei worksite from fuel are listed under Scope 3, which until FY2020 was included in Scope 1.
  • *2The recovery quantities of fluorocarbons and halons have been tabulated, and disclosed (the recovery quantity of halons have been included until FY2018).
    The recovery quantities of fluorocarbons and halons that have been emitted by the Group Companies have been tabulated, and disclosed (the recovery quantity of halons have been included until FY2018) in accordance with the Fluorocarbons Recovery and Destruction Act.
    Leak quantities were tabulated in accordance with the Act for Rationalized Use and Proper Management of Fluorocarbons. Negligible leak quantities are not disclosed.
Supply Chain CO2 Emissions (Scope3)
Category Unit FY2019 FY2020 FY2021 FY2022 FY2023
Supply Chain CO2 Emissions (Scope3) Total 103t-CO2 — — 753 668 641
1. Purchased goods and services 103t-CO2 — — 246 216 200
2. Capital goods 103t-CO2 — — 19 12 16
3. Fuel-and energy-related activities not included in Scope 1 or Scope2 103t-CO2 — — 17 12 15
4. Upstream transportation and distribution 103t-CO2 — — 9 5 2
5. Waste generated in operations 103t-CO2 — — 13 18 10
6. Business travel 103t-CO2 — — 1 1 1
7. Employee commuting 103t-CO2 — — 1 1 1
8. Upstream leased assets 103t-CO2 — — 0 0 0
9. Downstream transportation and distribution 103t-CO2 — — 5 5 3
10. Processing of sold products 103t-CO2 — — — — —
11. Use of sold products 103t-CO2 — — 405 361 369
12. End of life treatment of sold products 103t-CO2 — — 9 7 5
13. Downstream leased assets 103t-CO2 — — 28 28 18
14. Franchises 103t-CO2 — — — — —
15. Investments 103t-CO2 — — — — —
  • *From FY2021 emissions, values based on the GHG Protocol, etc. are disclosed.
  • *Note: Data are from TAISEI Group Company is excluding TAISEI COPORATION (domestic).

Projected CO2 Emissions in the Building Operation Phase

Calculation according to 1990 standard

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Projected CO2 emissions 103t-CO2 / year 15 42 19 13 23
Calculated values according to 1990 standard 103t-CO2 / year 25 72 34 26 44
Discrepancy between projected CO2 and 1990 standard (rate) % 39.5 41.4 44.6 49.8 46.6
Emissions by floor space kg-CO2 / year・m2 23 32 17 11 25
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
Calculation according to 2022 standard

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Projected CO2 emissions 103t-CO2 / year — — — — 35
Calculated values according to 2022 standard 103t-CO2 / year — — — — 49
Discrepancy between projected CO2 and 2022 standard (ratio) % — — — — 28.7
Emissions by floor space kg-CO2
/ year・m2		 — — — — 37
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
  • *From FY2023, calculated values according to 1990 standard and 2022 standard are disclosed, respectively.
  • *Key difference between the calculation according to 2022 standard and 1990 standard:
  • -Changed that calculation of the standard primary energy from using the results of the Company to using nationwide statistics of the standard primary energy consumption in the Act on the Rational Use of Energy.

Total Construction By-product (Waste / valuable resources)

Total Construction By-products

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Total construction by-products 103t 2,411 1,787 1,976 2,012 2,434
Excluding sludge and specially controlled industrial wastes 1,268 1,066 1,119 1,314 1,293
Final disposal quantity 128 71 62 73 96
Excluding sludge and specially controlled industrial wastes 74 51 38 42 62
Quantity recycled 2,283 1,715 1,914 1,939 2,338
Excluding sludge and specially controlled industrial wastes 1,194 1,016 1,082 1,272 1,231
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
Emissions (103t) and Recycle Rate by type (FY2023)

Third-party assured values are indicated with the mark

  Civil engineering Building construction Total Recycling rate (%)
New Construction Demolition Subtotal
Concrete remnants 223 216 392 609 832 100
Asphalt-concrete remnants 45 48 7 55 100 100
Construction site sludge 772 258 27 285 1,056 —
Mixed waste 41 27 5 32 73 78.1
Wood scrap 13 8 4 11 24 94.8
Metal scrap 2 15 19 34 36 99.2
Waste plastics 1 5 1 6 7 66.7
Miscellaneous 174 95 36 131 305 75.3
Total 1,272 671 491 1,162 2,434 —
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
Recycling Rate

Third-party assured values are indicated with the mark

  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Concrete remnants % 100 100 100 100 100
Asphalt- concrete remnants 99.5 100 100 100 100
Wood scrap 95.0 95.0 95.0 94.9 94.8
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
  • *The above three items are specific construction material waste based on the Construction Material Recycling Act.

Management of Hazardous Wastes

Hazardous Waste Quantity
  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Specially Controlled Industrial Wastes 103t 10 3 3 3 5
Waste asbestos, etc. 2 1 3 3 4
Industrial wastes containing asbestos 14 5 15 17 24
Mercury-using products 0 0 0 0 0
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
PCB Wastes
  Unit FY2019 FY2020 FY2021 FY2022 FY2023
Quantity of PCB wastes generated and discarded kg 0 0 31 27 0
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
Volatile Organic Compounds (VOC discharge quantity)
  Unit FY2019 FY2020 FY2021 FY2022 FY2023
VOC emissions* — N/A N/A N/A N/A N/A
  • *Note: Data are from TAISEI Corporation (non-consolidated) (domestic).
  • *There were no items that fall under the heading of volatile organic compound discharging facilities and discharge criteria subject to regulation as established by the Volatile Organic Compound (VOC) Discharge Control System (Ministry of the Environment).

Environmental Data / Indicator Calculation Method / Criteria

Target organizations
  • -Domestic enterprises of Taisei Group companies (Taisei Corporation, Taisei Rotec Corporation, Taisei-Yuraku Real Estate Co., TAISEI U-LEC CO., LTD, Seiwa Renewal Works, Taisei Setsubi Co., Ltd., J-FAST Co., Ltd., Taisei Housing Corporation)
  • -The target organizations cover more than 90% of the sales of the entire Taisei Group.
Category by type of worksite Construction site (civil engineering / building), office (not including development projects and other projects) or factory
CO2 emissions Scope categories Scope1: CO2 emissions from burning of fossil fuels (including transport of surplus soil and construction by-products from worksites)
Scope2: Indirect CO2 emissions from the use of power, steam or hot and cold water
Scope3: CO2 emissions from other companies involved in business activities
Taisei Corporation
INPUT Calculation method / criteria
Fossil fuel use 103kL Aggregation criteria
  • Aggregated in conformance with the Act on Rationalizing Energy Use and Shifting to Non-fossil Energy, Act on Promotion of Global Warming Countermeasures, the GHG Protocol, the Japan Federation of Construction Contractors guidelines, etc., and based on in-house regulations relating to environmental data management, the Taisei Group environmental data aggregation manual, and the Taisei Corporation environmental data aggregation manual.
Calculation of use
  • -Offices: Annual purchase quantity and usage are aggregated for each month
  • -Construction site (Civil Engineering and Building worksites): Annual consumption was aggregated for 338 sampled worksites and the consumption per unit of construction sales (basic unit) for the period was calculated. The worksites(excluded sampled worksites), derived by multiplying the basic unit by the construction sales of Taisei and calculated. For civil engineering, this calculation is performed for each construction type.
  • *Energy-related: Major fossil fuels (heavy oil, light oil, gasoline (office), kerosene),electricity, city gas, diesel alternative fuel(GTL,B5,etc.) steam, and hot and cold water consumption and their energy-equivalent values
  • *The total of energy usage is the value of fossil fuel usage + power usage + city gas (office) usage + steam and hot and cold water usage converted into joules.
Electricity use 106kWh
City gas (offices) 103m3
Water (consumption) 103m3
Quantity of the main construction materials — Calculation method of the main construction materials usage:
  • -The purchase quantity of main construction materials (ready-mixed concrete, cement, aggregates and steel) purchased for construction by Taisei Corporation is calculated. For independent construction work by Taisei Corporation, the directly purchased quantity; and for construction work as the representative of a joint venture construction, the purchased quantity multiplied by Taisei's share sales, is used. For joint venture constructions, in which Taisei is not representative, material usage is calculated based on Taisei’s construction sales for the year.
OUTPUT Calculation method / criteria
CO2 emissions
Scope1 and 2		 103t-CO2 Aggregation criteria
  • Aggregated in conformance with the Act on Rationalizing Energy Use and Shifting to Non-fossil Energy, Act on Promotion of Global Warming Countermeasures, the GHG Protocol, the Japan Federation of Construction Contractors guidelines, etc., and based on in-house regulations relating to environmental data management and the Taisei Group environmental data aggregation manual.
CO2 emission factor
  • Light oil, heavy oil, etc.: Calculated using the emissions coefficients in the Act on Rationalizing Energy Use and Shifting to Non‐fossil Energy and Act on Promotion of Global Warming Countermeasures.
    GTL: Calculated using the 2.36 kg‐CO2 / L computed by Shell Global Solutions.
    Power: Calculated using 0.437 t‐CO2/kWh, the post‐adjustment emissions factor of the figures (FY2022 CO2 emissions results (confirmed value)) announced by the Electric Power Council for a Low Carbon Society (ELCS). For offices, calculated using the post‐adjustment emission factor for the FY 2022 results for each electric power company.
Construction stage: CO2 emission per construction sales
  • Calculated by dividing the CO2 emission of Taisei sites (Civil Engineering and Building Construction) by the construction sales of Taisei.
  • *Calculation of CO2 emission of the Civil Engineering and Building Construction (worksites): Annual consumption of fossil fuels, electricity, and GTL was aggregated at the sampled worksites and combined with the annual consumption of the other worksites, derived by multiplying the basic unit by the construction sales of Taisei, and calculated by multiplying it by the CO2 emission factor.
NOx t Emissions from light oil, heavy oil, and kerosene are calculated using the emissions coefficient in the Architectural Institute of Japan “Building LCA Guidelines: Assessment Tool for Global Warming, Resource Consumption and Waste Measures (revised version).”
SOx t
Construction by-products 103t Construction by-product from independent construction work, joint venture construction in which Taisei is the representative, and construction by-product generated at owned factories, etc. (wastes/valuable resources).
Supply chain CO2 emissions Calculation method / criteria
CO2 emissions Scope3 103t-CO2 Aggregation criteria
  • Aggregated in conformance with the basic guidelines for calculation of greenhouse gas emissions throughout the supply chain, the GHG Protocol, etc., and based on in‐house regulations relating to environmental data management and the Taisei Group environmental data aggregation manual.
CO2 emission factor
  • Calculated using the emission factors in the basic guidelines for calculation of greenhouse gas emissions throughout the supply chain (LCI database IDEAv2 (for calculation of supply chain greenhouse gas emissions)), IDEAv3.3, and the emission factors of the figures that announced by Japan Cement Association LCI and Japan Society of Civil Engineers.
  • Category 1: Purchased products / services
  • CO2 emissions are calculated by multiplying the purchase quantities of each of the major construction materials (ready mixed concrete, cement, aggregate, and steel) by the factor. Then, using the “Appendix 1.4.7 CO2 emissions per unit price of construction based on the 2005 Construction Sector Input‐Output Table for Analysis ((iii) For Overseas spillover and consumption expenditures)” of the Architectural Institute of Japan “Building LCA Guidelines” “LCA Database Ver. 1.02,” emissions of all items are calculated from the CO2 emissions of the major construction materials.
  • Category 11: Use of sold products
  • Calculated by multiplying the total floor area of the completed building by the emission factor (calculation for each use from past 3 year’s performance: calculated by emissions by floor area of projected CO2 emissions at the operational stage) and the service life (Comprehensive Assessment System for Building Environmental Efficiency (CASBEE) assessment manual).
Projected CO2 emissions at the building operation stage Calculation method / criteria
Projected CO2 emissions 103t-CO2 / year
  • -Of the buildings constructed by Taisei Corporation, emissions for the 1.2 million m2 from 53 projects with a total floor area of 300 m2 or greater were calculated using the Energy Saving Plan for each project at the design stage.
  • -Of above, the projects with acquired certification of the Building-Housing Energy-efficiency Labeling System (BELS) were calculated using the value at the acquisition.
  • -Energy Saving Plan: Compilation of the steps to be taken to reduce energy usage by thermal insulation and high efficiency air conditioning equipment, etc. in accordance with the Act on the Rational Use of Energy, etc. Must be submitted at the design stage for buildings with a total floor area of 300 m2 or greater.
  • *Standard primary energy based on 1990 standard was calculated using the results of the Company.
  • *Standard primary energy based on 2022 standard was calculated using nationwide statistics of the standard primary energy consumption in the Act on the Rational Use of Energy.
Calculated value based on 1990 and 2022 standard 103t-CO2 / year
Ratio of projected CO2 emissions to calculated value based on 1990 and 2022 stadard %
Emissions by floor area kg-CO2 / year・m2
Emissions and recycle rate for construction By-products by type Calculation method / criteria
Construction by product 103t Construction by‐product from independent construction work and joint venture construction in which Taisei is the representative, and construction by‐products generated at owned factories, etc. (wastes / valuable resources).
Recycle rate %
Group Companies
INPUT Calculation method / criteria
Fossil fuel use 103kL Aggregation criteria
  • Aggregated in conformance with the Act on Rationalizing Energy Use and Shifting to Non‐fossil Energy, Act on Promotion of Global Warming Countermeasures, GHG Protocol, and the Japan Federation of Construction Contractors guidelines, etc., and based on in‐house regulations relating to environmental data management, the Taisei Group environmental data aggregation manual, and the manuals of each Group company.
Calculation of use
  • -Offices and Factories: Annual purchase quantity and usage are aggregated for each month
  • -Construction site (Civil Engineering and Building worksites): Aggregated based on the Taisei Group environmental data aggregation manual and the manuals of each Group company
  • *Energy‐related: Major fossil fuels (heavy oil, light oil, kerosene, gasoline), electricity, city gas, GTL (Gas to Liquids), LPG, and LNG consumption and their energy‐equivalent values.
  • *The total of energy usage is the value of fossil fuel usage + electricity usage + city gas usage + LPG usage + LNG usage converted into joules.
Electricity use 106kWh
City gas 103m3
LPG t
OUTPUT Calculation method / criteria
CO2 emissions 103t-CO2 Aggregation criteria
  • Aggregated in conformance with the Act on Rationalizing Energy Use and Shifting to Non‐fossil Energy, Act on Promotion of Global Warming Countermeasures, GHG Protocol, and the Japan Federation of Construction Contractors guidelines, etc., and based on in‐house regulations relating to environmental data management and the Taisei Group environmental data aggregation manual.
CO2 emission factor
  • Light oil, heavy oil, etc.: Calculated using the emissions coefficients in the Act on Rationalizing Energy Use and Shifting to Non‐fossil Energy and Act on Promotion of Global Warming Countermeasures.
    GTL: Calculated using the 2.36 kg‐CO2 / L computed by Shell Global Solutions.
    Power: Calculated using 0.437 t‐CO2 / kWh, the post‐adjustment emissions factor of the figures (FY2022 CO2 emissions results(confirmed value)) announced by the Electric Power Council for a Low Carbon Society(ELCS). For offices, calculated using the post‐adjustment emission factor for the FY 2022 results for each electric power company.
Construction by-products 103t Construction by‐product from independent construction work, joint venture construction in which Taisei is the representative, and construction wastes generated at owned factories.
Supply chain CO2 emissions Calculation method / criteria
CO2 emissions Scope3 103t-CO2 Aggregation criteria
  • Aggregated in conformance with the basic guidelines for calculation of greenhouse gas emissions throughout the supply chain, the GHG Protocol, etc., and based on in‐house regulations relating to environmental data management and the Taisei Group environmental data aggregation manual.
CO2 emission factor
  • Calculated using the emissions factor in the basic guidelines for calculation of greenhouse gas emissions throughout the supply chain (LCI database IDEAv2 (for calculation of supply chain greenhouse gas emissions)).

Sustainability

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