Environmental Load of Business Activities

The depletion of energy resources, global warming, threats to biodiversity and other environmental problems are having an increasingly serious impact on the global environment. Given these situations, the SUMCO Group (Japan) identifies forms of energy such as electric power, chemical substances, waste products, and wastewater as significant environmental aspects in its production activities. And we pursue initiatives to consider the environment and reduce environmental load across all of our business activities.

Business Activities and Environmental Load in 2024 (SUMCO Group [Japan])

Business Activities and Environmental Load in 2024 (SUMCO Group [Japan])

(remark)

Underlined items are subject to third-party verification.
Figures are rounded to the nearest whole number, so the total of the breakdown and the total value shown may differ.
Additionally, data of High-Purity Silicon Corporation has been incorporated since 2024.

List of Boundaries

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Site Energy usage GHG emissions Water used/ waste-water Industrial waste generated VOC emissions PRTR emissions Atmos-pheric pollutant emissions Abbre-viation
Includes SUMCO Group companies in Japan Kyushu Factory (Nagahama, Imari) 〇 〇 〇 〇 〇 〇 〇 SUMCO
Kyushu Factory (Kubara, Imari) 〇 〇 〇 〇 〇 〇 〇
Kyushu Factory (Saga) 〇 〇 〇 〇 — — 〇
Yonezawa Plant 〇 〇 〇 〇 〇 〇 —
Chitose Plant 〇 〇 〇 〇 — — —
JSQ Division 〇 〇 〇 〇 — 〇 〇
SUMCO TECHXIV Corp. Nagasaki Plant 〇 〇 〇 〇 〇 〇 〇 STC
SUMCO TECHXIV Corp. Miyazaki Plant 〇 〇 〇 〇 — 〇 〇
SUMCO Technology Corp. Noda Plant 〇 〇 〇 〇 — 〇 〇 STEC
High-Purity Silicon Corporation 〇 〇 〇 〇 〇 〇 〇 HSJ
SUMCO Group Companies Overseas SUMCO Phoenix Corporation 〇 〇 〇 〇 — — 〇 SPX
PT. SUMCO Indonesia 〇 〇 〇 〇 — — 〇 SPTI
FORMOSA SUMCO TECHNOLOGY CORPORATION 〇 〇 〇 〇 — — 〇 FST
High-Purity Silicon America Corporation 〇 〇 〇 〇 — — 〇 HSA
SUMCO Europe Sales Plc 〇 〇 — — — — — SES
SUMCO Singapore Pte.Ltd. 〇 〇 — — — — — SSGP
SUMCO Taiwan Technology Corporation 〇 〇 — — — — — STWN
  • *Including all Japan and overseas sites.
  • *Since 2024, High-Purity Silicon Corporation and High-Purity Silicon America Corporation have been included in the boundaries.

Environmental Load (SUMCO Group / domestic)

GHG emissions (domestic) (thousand tons-CO2e per year)

SUMCO (Scope 1+2)SUMCO (Scope 1+2)

STC (Scope 1+2)STC (Scope 1+2)

HSJ (Scope 1+2)HSJ (Scope 1+2)

Scope 3 (Japan)Scope 3 (Japan)

Water consumption (domestic) (Mm3 per year)

SUMCOSUMCO

STCSTC

HSJHSJ

Environmental Load (SUMCO Group / overseas)

World MapWorld Map

GHG emissions (overseas) (thousand tons-CO2e per year)

SPTI (Scope1+2)SPTI (Scope1+2)

FST (Scope1+2)FST (Scope1+2)

SPX (Scope1+2)SPX (Scope1+2)

HSA (Scope1+2)HSA (Scope1+2)

Water consumption (overseas) (Mm3 per year)

SPTISPTI

FSTFST

SPXSPX

HSAHSA

  • *Since 2024, the GHG emission factors of the overseas affiliates have been based on either local emission factors or the International Energy Agency (IEA) Emission Factors.

Environmental Data (SUMCO Group / domestic and overseas)

GHG Emissions Data

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(thousand tons-CO2e per year)
Calculation Method 5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
Scope 1 (direct) Conventional 25 27 28 33 —
SBT-compliant*1 — — — 86 87
Scope 2 (indirect) Conventional 765 812 765 942 —
SBT-compliant*1 — — — 1,194 1,097
Scope 3 (other indirect) Conventional 694 758 882 1,133 —
SBT-compliant*1 — — — 1,769 *2
Scope 1&2 Conventional 790 839 793 975 —
SBT-compliant*1 — — — 1,280 1,185
Scope 1, 2&3 Conventional 1,484 1,597 1,675 2,109 —
SBT-compliant*1 — — — 3,049 *2
  • *1For the 2023 calculation, we have added the SBT-compliant calculation methods. From 2024 onwards, we disclose the results using SBT-compliant calculation methods.
  • *2We will disclose on our website when the calculation is complete.
  • (remark)
    Figures are rounded to the nearest whole number, so the total of each Scope and the total value shown may differ.
Greenhouse Gas Emissions Scope3 Data (SUMCO Group / domestic and overseas)

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(thousand tons-CO2e per year)
Category 2024
Domestic Overseas
1 Purchased goods and services 696 *2
2 Capital goods 290 *2
3 Fuel- and energy-related activities (not in Scope 1 or 2) 150 *2
4 Upstream transportation and distribution 72 *2
5 Waste generated in operations 18 *2
6 Business travel 5 *2
7 Employee commuting 19 *2
8 Upstream leased assets Not applicable Not applicable
9*1 Downstream transportation and distribution 2 *2
10*1 Processing of sold products 115 *2
11 Use of sold products Not applicable Not applicable
12*1 End-of-life treatment of sold products 25 *2
13 Downstream leased assets Not applicable Not applicable
14 Franchises Not applicable Not applicable
15*1 Investments 5 *2
  • *1Categories 9,10,12, and 15 were added for SBT certification after 2024.
  • *2We will disclose on our website when the calculation is complete.

(remark)

Figures are rounded to the nearest whole number, so the total of the breakdown and the total value shown may differ.

GHG Emissions Data (by Company)

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(thousand tons-CO2e per year)
Calculation Method 5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
SUMCO*1 Conventional 1,132 1,228 1,316 1,691 —
SBT-compliant*2 — — — 1,991 1,819
STC Conventional 119 131 120 184 —
SBT-compliant*2 — — — 184 164
HSJ SBT-compliant — — — 153 155
FST Conventional 165 165 167 171 —
SBT-compliant*2 — — — 360 *3
SPX Conventional 57 60 60 52 —
SBT-compliant*2 — — — 95 *3
SPTI Conventional 12 12 12 11 —
SBT-compliant*2 — — — 34 *3
HSA SBT-compliant — — — 230 *3
Other*4 SBT-compliant — — — 0.3 *3
Total Conventional 1,484 1,597 1,675 2,109 —
SBT-compliant*2 — — — 3,049 *3
  • *1Domestic Greenhouse Gas Emissions Scope3 is aggregated as "SUMCO".
  • *2For the 2023 calculation, we have added the SBT-compliant calculation methods. From 2024 onwards, we disclose the results using SBT-compliant calculation methods.
  • *3We will disclose on our website when the calculation is complete.
  • *4Overseas non-manufacturing sites
  • (remark)
    Figures are rounded to the nearest whole number, so the total of the breakdown and the total value shown may differ.
GHG Data (Scope 1) (SUMCO Group / domestic)

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(tons)
5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
CO2 25,000 27,000 28,000 31,000 25,158
CH4 — — — — —
N2O — — — — —
HFC 0.006 0.014 0.014 1.7 1.5
PFC — — — 0.048 0.048
SF6 — — — 0 0.001
NF3 — — — — —
  • *Figures are rounded to the nearest whole number, so the total of the breakdown and the total value shown may differ.
Energy Consumption(SUMCO Group / domestic and overseas)

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5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
Electricity usage (GWh) 1,792 1,877 1,963 1,899 2,462
Electricity (converted to petroleum) (kL) 451,085 472,505 494,290 478,178 548,868
Fuel (converted to petroleum) (kL) 8,804 9,670 10,103 10,868 27,872
Steam (converted to petroleum) (kL) — — — 1,561 16,553
Water Supplied (SUMCO Group / domestic and overseas)

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(Mm3 per year)
5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
Surface water (rivers, wetland, natural lakes) 14.8 15.7 17.3 17.9 20.5
Water underground (well water) 3.2 3.5 3.8 4.1 4.4
Quarry water — — — — —
Potable water 1.1 1.3 1.3 1.2 1.6
External drainage — — — — —
Rainwater — — — — —
Seawater — — — — —
Total 19.1 20.5 22.4 23.2 26.5
Water Supplied (by Company)

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(Mm3 per year)
5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
SUMCO 10.4 11.1 12.7 13.0 13.4
STC 4.2 4.6 4.8 5.2 5.5
HSJ — — — — 1.3
FST 2.8 3.0 3.0 3.2 4.0
SPX 1.3 1.4 1.5 1.4 1.4
SPTI 0.4 0.4 0.4 0.4 0.3
HSA — — — — 0.7
Total 19.1 20.5 22.4 23.2 26.5
  • *Please refer the page of "Effective Use of Water Resources" for water-stressed area.
Drainage Water(SUMCO Group / domestic and overseas)

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(Mm3 per year)
5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
Total water drained into the ocean 8.6 9.1 10.3 10.7 11.9
Total water drained to surface water sources — — — — —
Total water drained to underground sources / well water sources — — — — —
Total water drained outside of plants 4.7 4.8 5.1 5.4 5.9
Other drainage water 3.1 3.5 3.5 3.4 3.8
Total drainage water 16.4 17.4 18.9 19.5 21.6
Drainage Water (by Company)

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(Mm3 per year)
5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
SUMCO 8.9 9.6 10.8 10.8 11.1
STC 3.7 4.0 4.2 4.5 4.8
HSJ — — — — 0.8
FST 2.3 2.3 2.3 2.7 3.0
SPX 1.1 1.1 1.2 1.2 1.3
SPTI 0.4 0.4 0.4 0.3 0.3
HSA — — — — 0.3
Total 16.4 17.4 18.9 19.5 21.6
VOC emissions (SUMCO Group / domestic)

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(tons per year)
5 years prior (2020) 4 years prior (2021) 3 years prior (2022) 2 years prior (2023) Last year (2024)
VOC 8.4 11.3 10.3 5.5 4.9
  • *Chemical Substances have been tabulated based on the PRTR system of the Ministry of Economy, Trade and Industry since 2021.

Third Party Verification of GHG Emissions (SUMCO Group / domestic)

We have conducted third-party verification in accordance with ISO14064-3 for Scope 1, 2, and 3 (Categories 1, 2, and 3) to improve the reliability of the calculation results for GHG emissions of the SUMCO Group (Japan), and obtained a verification report.