Material Flow

Material Flow

Taisei Corporation Material Flow

Third-party assured values are indicated with the mark

INPUT Units FY 2016 FY 2017 FY 2018 FY 2019 FY 2020
Total energy use 109MJ 3.67 3.90 4.14 4.39 3.60
Construction Site (building) 109MJ 1.61 1.72 1.61 1.99 1.04
Construction Site (civil engineering) 109MJ 1.81 1.95 2.31 2.18 2.35
Offices 109MJ 0.24 0.23 0.22 0.22 0.22
Total fossil fuel use 103kL 61.9 68.9 79.0 76.7 61.4
Diesel 103kL 60.0 66.3 77.8 75.2 60.0
Kerosene 103kL 1.4 2.0 0.5 0.6 0.9
Heavy oil 103kL 0.5 0.6 0.8 1.0 0.5
Total electricity use 106kWh 129 125 111 145 122
Construction Site (building) 106kWh 35 49 43 57 21
   Construction Site (civil engineering) 106kWh 76 60 52 73 87
Offices 106kWh 18 16 15 15 15
City gas (offices) 103m3 94 227 140 213 259
Total quantity of the main construction materials 103t 7,738 6,811 6,540 7,369 4,966
Ready mixed concrete 103t 4,833 4,375 3,375 4,066 3,855
Aggregates (gravel, crushed stone, etc.) 103t 1,979 1,679 2,038 2,514 387
Cement 103t 262 283 695 263 172
Steel 103t 638 446 414 506 534
Timber 103t 15 24 16 16 17
Asphalt 103t 11 4 2 3 1
(of which the green procurement quantity)*1 103t 681 995 1,253 2,106 1,941
Total concrete formwork use 103m2 3,042 4,082 3,464 2,931 3,039
Tropical plywood formwork 103m2 1,801 2,850 1,883 1,920 1,990
Alternative formwork 103m2 1,241 1,233 1,581 1,011 1,049
Alternative formwork percentage 40.8 30.2 45.6 34.5 34.5
Water (consumption) 103m3 2,338 1,691 1,436 1,414 1,412
OUTPUT Units FY 2016 FY 2017 FY 2018 FY 2019 FY 2020
Total CO2  emissions 103t-CO2 231 245 261 267 216
Construction Site (building) 103t-CO2 106 110 102 124 66
Construction Site (civil engineering) 103t-CO2 113 124 148 133 140
Offices 103t-CO2 12 11 11 10 10
Total CO2 emissions 103t-CO2 231 245 261 267 216
Scope1 103t-CO2 138 151 179 172 142
Scope2 103t-CO2 71 67 57 69 57
Scope3 103t-CO2 22 27 25 26 17
NOX t 1,040 1,151 1,345 1,302 1,039
SOX t 158 175 205 200 158
Quantity of Chlorofluorocarbon recovered*2 t 18 12 15 21 -
Construction waste 103t 2,415 2,644 2,020 2,411 1,787
Quantity recycled 103t 2,320 2,528 1,924 2,283 1,715
Quantity of direct final disposal 103t 95 116 96 128 71
Water (discharged) 103m3 8,172 4,701 4,483 4,288 6,625
  • *1The quantity used as green procurement products out of the main construction materials
  • *2Up to FY 2019, the quantities of fluorocarbons and halons emitted by Taisei that have been recovered have been tabulated and disclosed (halon recovery quantities since FY2018), in accordance with the Fluorocarbon Recovery and Destruction Act. In FY 2020, leak quantities were tabulated in accordance with the Act for Rationalized Use and Proper Management of Fluorocarbons. Leak quantities were minute and were therefore not disclosed.

Material Flow for Group Companies

Third-party assured values are indicated with the mark

INPUT Units FY2016 FY2017 FY2018 FY2019 FY2020
Total energy use 109MJ 1.61 1.53 1.62 1.68 1.70
Sites (construction sites) 109MJ 0.37 0.29 0.39 0.32 0.37
Factories 109MJ 1.10 1.12 1.10 1.23 1.20
Offices 109MJ 0.14 0.13 0.12 0.12 0.13
Total fossil fuel use 103kL 27 25 26 26 27
Diesel 103kL 11 9 12 10 11
Kerosene 103kL 2 2 2 3 3
Heavy oil 103kL 12 12 11 11 11
Gasoline 103kL 2 2 2 2 2
GTL 103kL - - - - 0
Total electricity use 106kWh 42 41 40 43 43
Sites (construction sites) 106kWh 1 1 1 1 1
Factories 106kWh 34 33 33 35 35
Offices 106kWh 7 7 7 7 7
City gas 103m3 3,622 3,794 4,628 5,692 5,056
LPG t 92 63 378 485 575
Water (consumption) 103m3 132 153 115 138 109
OUTPUT Units FY2016 FY2017 FY2018 FY2019 FY2020
Total CO2 emissions 103t-CO2 101 95 100 101 102
Sites (construction sites) 103t-CO2 26 19 27 22 25
Factories 103t-CO2 67 68 66 72 70
Offices 103t-CO2 8 7 7 7 7
Total CO2 emissions 103t-CO2 101 95 100 101 102
Scope1 103t-CO2 77 73 79 79 80
Scope2 103t-CO2 23 21 20 20 19
Scope3 103t-CO2 2 1 1 2 3
NOX t 249 211 257 227 224
SOX t 109 106 107 103 105
Quantity of Chlorofluorocarbon recovered t 2 2 3 2 2
Total industrial waste generated 103t 352 259 266 485 416
Quantity recycled 103t 333 248 256 475 406
Final disposal quantity 103t 19 11 10 10 10
Water (quantity discharged) 103m3 121 143 109 74 76

Third-party Assurance of Environmental Data within the Taisei Group

Over the past five years, we have standardized and manualized the method of collecting and aggregating environmental data such as the quantity of energy consumed, the quantity of CO2 emissions and the volume of industrial waste for the 7 main group companies participating in the Taisei Group Environmental Promotion Conference. In FY2018, continuing from the previous year, the 7 main group companies received third-party assurance for their actual performance data.
Among the group companies, TAISEI ROTEC CORPORATION, Taisei-Yuraku Real Estate Co., Ltd., and TAISEI HOUSING CORPORATION, were inspected by auditors visiting their head offices, major offices and factories.
Third-party assurance not only guarantees the data reliability but also leads to a review and improvement of the management structure and initiatives of each group company.

  • The calculated total values may not be consistent with the total values due to data rounding.
  • Third-party assured values are indicated with the mark.

Calculation Stan of Environmental Index and Data

Objective Items Caluculation Method & Standard
Material
flow-related
Classification by business type Classification into civil engineering and building construction (sites), officies (excluding development projects and others), and factories
CO2 emissions Scope classification Scope1 : CO2 emissions associated with the combustion of fossil fuels
Scope2 : Indirect CO2 emissions associated with the use of electricity, steam, and chilled and hot water
Scope3 : CO2 emissions associated transport of soil from construction (generated from off-site)
CO2emissions Calculation standard
Calculated based on in-house standards and the Taisei Group’s environmental data calculation manual for the management of environmental information, complying with the Act on the Rational Use of Energy, the Act on Promotion of Global Warming Measures, the Waste Disposal and Public Cleansing Act, and the GHG Protocol, etc.
In calculation of CO2 emissions, Taisei Corporation uses the value of the fuel consumption of the Japan Construction Mechanization Association, from which the fat content is excluded.
NOX and SOX emissions Calculation of NOx and SOx emissions originating from diesel, heavy oil, and kerosene. Calculated using the emission coefficient of the Architectural Institute of Japan’s “Guide to Building LCA - Evaluation Tool for Measures against Global Warming, Resource Consumption, and Waste - Revised Version.”
[Offices and Factories]
Energy-related and water consumption
Calculation standard
Calculated based on in-house standards and the Taisei Group’s environmental data calculation manual for the management of environmental information, complying with the Act on the Rational Use of Energy, the Act on Promotion of Global Warming Measures, and the GHG Protocol, etc.
- Energy-related and water consumption
- Offices and factories: The annual quantities purchased and used are calculated in monthly units.
* Energy-related: Fossil fuels (heavy oil, diesel, gasoline, kerosene, GTL), electrical power, city gas, and LPG consumption and their energy-equivalent values.
[Civil Engineering and Building Construction (sites)]
Energy-related and water consumption
Calculation standard
Calculated based on in-house standards and the Taisei Group’s environmental data calculation manual for the management of environmental information, complying with the Act on the Rational Use of Energy, the Act on Promotion of Global Warming Measures, and the GHG Protocol, etc.
- Energy-related and water consumption
- Civil Engineering and Building Construction (sites): Consumption in a two-month period in FY2020 is sampled at 173 construction sites to calculate the consumption per unit of construction turnover (basic unit). Annual consumption is calculated by multiplying this basic unit by the construction turnover for the year. For civil engineering, this calculation is performed for each construction type.

* Energy-related: Fossil fuels (heavy oil, diesel, gasoline, kerosene), electrical power, city gas, and LPG consumption and their energy-equivalent values.
[Civil Engineering and Building Construction (sites)]
Calculation of the main construction
materials (concrete
formworks and alternative formworks)
purchased
- Amount of the main construction materials used: The quantities of the main construction materials directly through individual construction of Taisei Corporation and joint venture construction for which Taisei Corporation is the representative.
[Civil Engineering, Building Construciton
(sites), and Factories]
Caluculation of construction and industrial waste generated
Construction by-products (waste and valuable resources) generated at the sites of individual construction projects, joint venture construction for which Taisei Group is the representative, and factories owned by Taisei Group.
Prevention of
global
warming
Estimated CO2 emissions and CO2
reduction rate in the operation stage
Calculated value based on the FY1990
standard
Emissions per unit floor area
Calculated using the “Energy Efficiency Plan” for each of 65 projects, each with a total floor area of 300 m2 or more and with a total area of about 1,300,000 m2, of Taisei Corporation building construction projects.
- Energy Efficiency Plan: A plan that summarizes the measures for the efficient use of energy such as building thermal insulation and air conditioning facilities, which is required to be submitted when designing buildings with a total floor area of 300 m2 or more in accordance with the Act on the Rational Use of Energy.
Resource
recycling
Results for adoption of green procurement
items
Calculated the quantities based on the design specifications by Eco Sheet CASBEE introduced to buildings designed by Taisei Corporation
Recycled amount Total amount of sale of valuable resources, wide-area certification, self-disposal, and intermediate treatment
Final disposal amount Total amount of direct final disposal and intermediate processing residue
Final disposal rate (final disposal amount / amount arising) * 100 (excluding construction sludge and amount not attributable to Taisei Corporation)
  • Organizations covered:
    the Taisei Group (Taisei Corporation, TAISEI ROTEC CORPORATION, Taisei-Yuraku Real Estate Co., Ltd., TAISEI U-LEC CO., LTD., TAISEI SETSUBI CO., LTD., TAISEI HOUSING CORPORATION, SEIWA RENEWAL WORKS CO., LTD., and J-FAST Co., Ltd.), which are all within Japan only. Environmental data cover more than 90% of the sales made by the entire Taisei Group.
  • Calculation standard:
    Calculated based on in-house standards and the Taisei Group's environmental data calculation manual for the management of environmental information, complying with the Act on the Rational Use of Energy, the Act on Promotion of Global Warming Measures, the Waste Disposal and Public Cleansing Act, and the GHG Protocol, etc. In calculation of CO2 emissions, Taisei Corporation uses the value of the fuel consumption of the Japan Construction Mechanization Association, from which the fat content is excluded.
  • Energy-related:
    Fossil fuels (heavy oil, diesel, gasoline, kerosene), electrical power, city gas, and LPG consumption and their energy equivalent values
  • Third-party assured values (independent assurance report on E-12) are indicated with the mark.
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