Sustainability

Environmental Performance

The table below shows aggregate inputs to and outputs from manufacturing operations of the entire NGK Group at all domestic and overseas sites. Inputs represent data for raw materials and energy etc. and outputs for manufactured products and services as well as substances that are discharged into the atmosphere and into water.

FY2020 NGK Group Material Balance (Input and Output)

Category Item Unit FY2018 FY2019 FY2020
Consolidated Non-consolidated Consolidated Non-consolidated Consolidated Non-consolidated
INPUT Electric power TWh 0.93 0.25 0.95 0.25 0.88 0.22
Gas (natural gas conversion) Million Nm3 142 20 137 19 116 17
Oil (light oil conversion) Million L 2.11 0.28 1.74 0.30 1.65 0.31
Raw materials 103 metric tons 180 30 150 30 140 30
Recycled materials 103 metric tons 0 0 0 0 0 0
PRTR-listed substances Metric tons 694 219 589 236 506 188
Total water usage Million m3 4.53 1.60 4.33 1.55 3.78 1.45
OUTPUT Energy-origin CO2 106 metric tons of CO2 0.87 0.16 0.87 0.16 0.76 0.13
Other greenhouse gases 103 metric tons of CO2 1 0 1 0 0 0
CO2 (non-energy origin) 103 metric tons of CO2 0 0 0 0 0 0
CH4 103 metric tons of CO2 0 0 0 0 0 0
N2O 103 metric tons of CO2 0 0 0 0 0 0
HFC 103 metric tons of CO2 0 0 0 0 0 0
PFC 103 metric tons of CO2 0 0 0 0 0 0
SF6 103 metric tons of CO2 0 0 0 0 0 0
VOC Metric tons 120 0 68 0 83 0
PRTR-listed substances (emissions into atmosphere) Metric tons 128 3 76 3 89 3
Discarded materials 103 metric tons 60 10 50 10 50 10
Recycled 103 metric tons 40 10 40 10 30 10
Disposed of externally 103 metric tons 20 0 10 0 10 0
Total water discharge Million m3 2.81 1.37 3.14 1.40 2.53 1.09
PRTR-listed substances (discharge into bodies of water) Metric tons 0 0 1 1 0 0
Scope 1 (energy-origin CO2) 106 metric tons of CO2 0.32 0.04 0.31 0.04 0.26 0.04
Scope 2 (energy-origin CO2) 106 metric tons of CO2 0.55 0.12 0.56 0.11 0.49 0.10
Notes:
  • Environmental performance values in this data book have been rounded off for convenience; therefore the sum of individual values may not match the totals.
  • “Discarded materials” indicates the total amount of industrial waste and valuables.
  • Figures in the non-consolidated column indicate data from non-consolidated NGK production bases (Headquarters, Nagoya Site, Chita Site, Komaki Site, Ishikawa Plant).
  • For the consolidated values of OUTPUT/energy-origin CO2 and Scope 2 (energy-origin CO2), as with the non-consolidated values, the calculation standard has been changed from the previous fixed value for the emission coefficient of electricity (a factor for converting electricity consumption into CO2) to annually updated values of each electric power supplier.

Water Consumption and Recycling Rate

Water Withdrawal by Source, Water Discharge by Destination, Recycled Amount, Recycling Rate

Item Unit FY2018 FY2019 FY2020
Consolidated Non-consolidated Consolidated Non-consolidated Consolidated Non-consolidated
Water
withdrawal
Municipal government water utility (or other water utility) Million m3 3.91 1.14 3.71 1.08 3.13 0.949
Groundwater Million m3 0.62 0.47 0.62 0.47 0.64 0.497
Surface water (lakes, rivers, etc.) Million m3 0.002 0.0 0.001 0.0 0.002 0.0
Total Million m3 4.532 1.610 4.331 1.550 3.777 1.445
Water
discharge
Sewerage Million m3 0.71 0.19 0.66 0.20 0.60 1.65
Rivers, lakes, etc. Million m3 2.10 1.18 2.48 1.20 1.935 0.92
Waste Million m3 0.0 0.0 0.0 0.0 0.0 0.0
Ground permeation Million m3 0.0 0.0 0.0 0.0 0.0 0.0
Total Million m3 2.81 1.37 3.14 1.40 2.534 1.092
Recycled amount Million m3 0.09 0.0 0.09 0.0 0.066 0.0
Recycling rate % 2.0 0.0 2.0 0.0 1.7 0.0

INPUT

1.Energy
Electric power:
Consumption amount of electric power
Gas:
Consumption volume of each type of fuel gas converted into natural gas volume =Σ(Consumption volume of each fuel gas × Unit heating value of each fuel gas/Unit heating value of natural gas)

<Unit heating value of fuel gas>
Natural gas: 43.5 MJ/Nm3 City gas: 45.0 MJ/Nm3
LPG: 50.8 MJ/kg LNG: 54.6 MJ/kg

Oil:
Consumption volume of each type of fuel converted into light oil volume =Σ(Consumption volume of each fuel × Unit heating value of each fuel/Unit heating volume of light oil)

<Unit heating value of fuel>
Light oil: 37.7 MJ/L Fuel oil A: 39.1 MJ/L Kerosene: 36.7 MJ/L Gasoline: 34.6 MJ/L

2.Water

Total consumption volume of city water, industrial water, well water, and rainwater

3. PRTR-listed substances

Total amount handled of Japan’s PRTR Type 1 listed substances

4. Raw materials

Total weight of raw materials used in product manufacturing

OUTPUT

5. Energy-origin CO2 emission volume

Energy-origin CO2 emission volume = Σ(Consumption of each energy × CO2 conversion factor of each energy)

<CO2 conversion factor of energy>
(Unit of electric power factor: kgCO2/kWh  Unit of fuel factor: kgCO2/fuel unit)

Electric power

Japan: Emission coefficient for each electric utility adjusted in Japan based on the Act on Promotion of Global Warming Countermeasures;

United States: Green-e values; Belgium, France, Poland: AIB values;

Australia: Australian National Greenhouse Accounts values;

other countries: IEA values

Fuel

Natural gas (Nm3): 2.22; City gas (NGK on a non-consolidated basis) (Nm3): 2.244;

City gas (except NGK on a non-consolidated basis) (Nm3): 2.23; LPG (kg): 3.00; LNG (kg): 2.70; Light oil (L): 2.58;

Fuel oil A (L): 2.71; Kerosene (L): 2.49; Gasoline (L): 2.32; Industrial steam (MJ): 0.06

6. Emission volume of other greenhouse gases

Emission volume of other greenhouse gases = Active mass × Emission factor × Global warming potential

<Global warming potential>
CO2: 1; CH4: 25; N2O: 298; HFC: Differs by type; PFC: Differs by type; SF6: 22800; NF3: 17200

7.Water discharge

Total amount of discharged water excluding rainwater

8.PRTR-listed substances

Discharge into bodies of water: Total amount of Class 1 substances listed under Japan’s PRTR Act discharged into public bodies of water
Emissions into the atmosphere: Total amount of Class 1 substances listed under Japan’s PRTR Act emitted into the atmosphere

9.Total amount of discarded materials generated

Total amount of discarded materials generated = Externally disposed amount*1 + Externally recycled amount
Recycled amount: Externally recycled amount = Paid disposal*2 + Valuable amount (selling off)

  • Externally disposed amount: Direct disposal by landfill, or simple incineration
  • Paid disposal: Outsourcing disposal and paying for recycling
10.Scope 1 to 3
Scope1:
Direct emissions of greenhouse gases by the reporting company (generated from the burning of fuel or industrial processes)
Scope2:
Indirect emissions of greenhouse gases by the reporting company resulting from the use of electricity, steam, or heat purchased from other companies
Scope3:
All other indirect emissions of greenhouse gases (not included in Scope 1 or 2) that occur in the reporting company’s value chain