Climate Change

The conservation of the global environment is one of our most important management issues

Response to climate change

Mitsui Kinzoku Group considers climate change as an important change in our external environment which may affect the continuity of our business. As our businesses include non-ferrous smelting, electrolytic copper foil, and other businesses with high energy consumption, we are well aware of the impacts of energy consumption and greenhouse gas (GHG) emissions from business activities on climate change. We are also concerned that these matters may have impacts on our Group’s business model and financial condition as climate change accelerates. With these as a background, Mitsui Kinzoku Group is striving to reduce energy consumption and further expand the use of renewable energy as clean energy in place of fossil fuels, among other efforts, to reduce risks associated with climate change. We will also take advantage of opportunities related to climate change by creating products that will contribute to the reduction of GHG emissions and that will meet our environmental criteria to be certified as our environmental contribution products.
In September 2020, we participated in the climate risk / opportunity scenario analysis support project in line with TCFD supported by the Ministry of the Environment of Japan, and launched a TCFD project team in the company. We are working to aiming for early information disclosure.

CO2・Energy Data

ESG Data Environment CO2・Energy

Reduction of GHG emissions(Scope 1 and 2)

In FY2019, we adopted a new calculation method of GHG emissions in line with the global trend of response to climate change. The method allows us to reflect our avoided emissions through the creation and use of renewable energy. Based on this calculation method, in June this year, we reset our GHG emissions reduction target by FY2030 over FY2013 levels at 26%, from the previous 7%, including avoided emissions from renewable energy use.

CO2 emissions from energy consumption(thousand t-CO2)(Scope1 and 2)


※ Emission amounts from overseas sites have been added to the total amount starting FY2017.
※ Figures for CO2 emissions from energy consumption were calculated using emission factors derived in a manner conforming to the “Act on Promotion of Global Warming Countermeasures.” CO2 emissions derived from purchased electricity in Japan were calculated using the latest basic emission factors of electric power suppliers. For emission factors overseas, the per-country emission factors “CO2 emission factors from electricity” reported by the International Energy Agency (IEA) were used.
※ We have received an independent practitioner’s assurance for the figures for FY2019 in this information to whichis attached.

Reduce CO2 emission in logistics(Scope 3)

Mitsui Kinzoku Group strives to reduce the use of transportation fuel. We are striving to improve the loading ratio at the time of transportation and shorten transportation routes and promote a modal shift from truck to railways and ships. We are also working to reduce transportation fuels and CO2 by negotiating the form and frequency of delivery with customers and suppliers.

CO2 emissions in logistics (Non-consolidated, t-CO2/year)
(Scope 3)


* The scope of data calculation covers only the transportation which are designated as Specified Consigner by the Act on the Rational Use of Energy.
* We have received an independent practitioner’s assurance for the figures for FY2019 in this information to whichis attached.

Energy-Saving Committee

Our activities to reduce GHG emissions are driven by the Energy-Saving Committee, a group-wide organization chaired by the Chief Environmental and Safety Officer. The committee promotes the reduction of energy consumption and the increase of renewable energy generation, while also providing education within the Group and keeping us updated on the trends in Japan and overseas, in order to achieve our long-term targets. The committee also reviews its policies as needed based on the previous year’s performance and deploys them across the sites.

Energy-Saving Committee image

Energy-saving activity in Takehara Refinery, Hiroshima prefecture

Creation of renewable energy

While keeping stable operation of existent renewable energy facilities, Mitsui Kinzoku Group works to introduce new renewable energy power generation projects as well as increase the ratio of renewable energy in its energy usage.
Kamioka Mining and Smelting Co., Ltd. completed the renewal construction work for five of its ten hydroelectric power plants in FY2018 and started full-scale operation from FY2019. The Copper Foil Division has newly installed solar power generation facilities at the sites in Ageo (Japan) and Taiwan with capacity of 10kW and 830kW respectively and started operation in April this year.

Kanakido power plant, Kamioka Mining and Smelting Co., Ltd. image

Kanakido power plant,
Kamioka Mining and Smelting Co., Ltd.

Okuaizu Geothermal Co., Ltd. image

Okuaizu Geothermal Co., Ltd.

Solar power plant, Hikoshima Smelting Co., Ltd. image

Solar power plant, Hikoshima Smelting Co., Ltd.

From car to bus
~ An attempt to reduce CO2 emission in MITSUI KINZOKU ACT~

In Mitsui Kinzoku Act Co., Ltd.'s Yokohama Honmoku Center, Kamome-cho, Naka-ku, Yokohama-shi, there are more than 400 employees including affiliated companies. Over 200 employees used to commute by car until March 2019.
April 2019, commuter bus service between Yokohama Honmoku Center and JR Negishi station started for the employees as an replacement for car commute.
As a result of this attempt, almost all of the employees stopped car commute, which greatly reduced CO2 emission from car commute. The amount of CO2 annual reduction by this attempt is estimated to be about 170,000kgs-CO2, which is almost equal to the CO2 emission for 200 cars ※1 and the annual CO2 absorption by approximately 12,000 cedar trees ※2.
In addition, further reduction of CO2 emission is expected as the operation of the bus service is entrusted to Yokohama Municipal Bus, which positively introduces environmentally-friendly vehicles.
※1  National Greenhouse Gas Emissions in Fiscal Year 2017 (Transportation Sector), Ministry of the Environment[only available in Japanese]
※2  CO2 Absorption Capacity of Forests, KANTO Regional Forest Office [only available in Japanese]

Commuter bus for MITSUI KINZOKU Act at JR Negishi Station (Yokohama Municipal Bus vehicle)

Commuter bus for MITSUI KINZOKU Act at JR Negishi Station
(Yokohama Municipal Bus vehicle)

Parking space in Honmoku Center


before Parking space in Honmoku Center image
before Parking space in Honmoku Center image


After Parking space in Honmoku Center image
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