Calculation Method for CO₂ Emissions
CO₂ emissions are calculated as follows.
| Activity type | Activity name | Calculation method |
|---|---|---|
| Scope 1 | Direct emissions (Energy-related) | Calculation formula: “Fuel consumption” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Greenhouse Gas Emissions Calculation and Reporting Manual (Ver6.0) (March 2025)" |
| Scope 1 | Direct emissions (Greenhouse gases emissions other than CO₂) | Calculation formula: "Fuel consumption" x "Per unit calorific value" x "Emissions factors" Emissions factors: The Ministry of the Environment of Japan "Greenhouse Gas Emissions Calculation and Reporting Manual (Ver6.0) (March 2025)" |
| Scope 2 Location-based | Indirect emissions | Calculation formula: "Electricity / Steam consumption" x "Emissions factors" Emissions factors: IEA Emissions Factors (2024) |
| Scope 2 Market-based | Indirect emissions | Calculation formula: "Electricity / Steam consumption" x "Emissions factors" Emissions factors: Supplier-specific emissions factors or IEA Emissions Factors (2024) |
| Scope 3 | — | — |
| Category 1 | Purchased goods and services | Calculation formula: “Amount of goods or services purchased” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(4) Stacked DB" or "(5) Input-Output Table" |
| Category 2 | Capital goods | Calculation formula: “Expenditure amount of capital goods” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(6) capital goods" |
| Category 3 | Fuel- and energy-related activities | Calculation formula: “Fuel / electricity consumption” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(7) electricity/heat usage" or "Inventory Database for Environmental Analysis Ver 2.3 (For calculation of supply chain greenhouse gas emissions),”IEA Emissions Factors(2024)" |
| Category 4 | Upstream transportation and distribution | Calculation formula: “products transported cost by transportation type” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(5) Input-Output Table" |
| Category 5 | Waste generated in operations | Calculation formula: “the amount of waste generated by resource” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(9) waste [by type]" |
| Category 6 | Business travel | Calculation formula: “Total business travel costs by type” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(11) Transportation expenses" |
| Category 7 | Employee commuting | Calculation formula: “Total commuting costs by type” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(11) Transportation expenses" |
| Category 8 | Upstream leased assets | Not applicable |
| Category 9 | Downstream transportation and distribution | Not applicable |
| Category 10 | Processing of sold products | Calculation formula: "Electricity consumption when installing in final product" x "Number of units sold" x "Emissions factors" Emissions factors: IEA Emissions Factors (2024) |
| Category 11 | Use of sold products | Calculation formula: “Electricity consumption of product *1” x “Lifetime usage time” x "Sales volume" x “Emissions factors*2” Emissions factors: IEA Emissions Factors (2024) *1 Select the representative model for each product type and calculate with the specifications of the highest number of sales. *2 Since many of our products are integrated into our customers' end products, it is difficult to identify the final destination countries where they are used. Therefore, we calculate CO₂ emissions with emission factors based on the countries of manufacture. |
| Category 12 | End-of-life treatment of sold products | Calculation formula: “Weight of representative products sold” x “Emissions factors” Emissions factors: The Ministry of the Environment of Japan "Emissions Unit Database for Accounting of Greenhouse Gas Emissions, etc., by Organizations Throughout the Supply Chain (Ver. 3.5)" "(9) waste [by type]" |
| Category 13 | Downstream leased assets | Not applicable |
| Category 14 | Franchises | Not applicable |
| Category 15 | Investments | Calculation formula: “Scope 1 and 2 emissions* of companies holding shares” x “Ownership ratio (%)” * Scope 1 and Scope 2 emissions of companies holding shares are based on data from the previous year due to data acquisition. |