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Climate Change Initiatives – To Become Carbon Neutral –

Renesas will be Carbon Neutral by 2050.

By 2030 Renesas will reduce greenhouse gas emissions by 60% from 2013 levels. This will be realized through our efforts to reduce the emission of PFC gas, a greenhouse gas that heavily impacts the environment. The initiatives also include pursuing energy conservation and expanding the use of reusable energy mainly in manufacturing sites which consume more energy. In addition, we are working to obtain SBT (Science Based Target) validation with this target.

Renesas will be Carbon Neutral by 2050


Environmental Impact of the Entire Value Chain

In order to understand the environmental impact of our business activities including the value chain, we have calculated the amount of greenhouse gas (GHG) emission from scope 1 through 3 based on the GHG protocol.

Figure: Renesas' GHG Emissions (by Scope)
FY2020 Classification Range and Calculation Method Emission amount (t-CO2) Ratio
Scope1 Direct emission of greenhouse gases Greenhouse gases emitted by Renesas 174,039 6.79%
Emission of PFC gases 128,051 -
Scope2 Indirect emission from the use of electricity, heat and steam Indirect emission following the use of electricity and gases provided by other companies 686,645 26.5%
Scope3 [C1] Purchased goods and services Emission following procurement of materials and production outsourcing 1,554,199 60.0%
[C2] Capital goods Emission following the increase of production equipment 46,930 1.8%
[C3] Fuel- and energy-related activities not included in Scope1 and 2 Emissions from upstream processes of procured electricity and fuel 114,641 4.4%
[C4] Upstream transportation and delivery  Emissions from production logistics within Japan 686 0.0%
[C5] Waste generated by operation Emissions from transportation and disposal of waste conducted by another party 6,125 0.2%
[C6] Business travel Emissions from employee business trips 1,813 0.1%
[C7] Employee commuting Emissions from employee commutes in Japan 4,402 0.2%
[C8] Upstream leased assets Not applicable (included in Category 1) 0 0.0%
[C9] Downstream transportation and delivery  Not applicable - -
[C10] Processing of sold products  Not applicable - -
[C11] Use of products sold Not applicable - -
[C12] Disposal of sold products  Not applicable - -

[C13] Downstream leased assets

Not applicable 0 0.0%
[C14] Franchises Not applicable 0 0.0%
[C15] Investments Not applicable 0 0.0%
Total 2,589,480 100.0%

Eco-Factory Initiatives

We are running several eco-factory initiatives, mainly in the form of reducing our manufacturing sites’ environmental impact, especially those which consume the most energy.

Energy Reduction Results in 2020

In 2020, we reduced energy consumption by 2.6% compared to the previous year of 2019. Energy intensity against revenue has also decreased by 2.3% in comparison to the previous year of 2019. This is not only the result of a consolidation and decommissioning of factories, but also the effect of energy-saving measures implemented at each factory and the result of diligent energy management.

In 2021, we will continue to promote energy-saving measures and strive for efficient use of energy corresponding to the Group’s business activities in order to reduce energy consumption and prevent global warming.

In addition, as part of our energy reduction activities, we have participated in the “Low Carbon Society Action Plan”, an initiative undertaken by the Japanese electrical and electronics industry since 2013. The Low Carbon Society Action Plan aims for the development of innovative technology which will contribute to the prevention of global warming, promoting international contributions though the transfer of technology, strengthening the cooperation among supply chains as well as reducing energy intensity against revenue by 1% every year. 

Figure: Total Amount of Energy Consumed VS Energy Consumption per Revenue
Changes in the amount of energy used


Main Measures to Reduce Energy Consumption

In line with the Energy Saving Act, we are working to reduce energy consumption by at least 1% per year over a five-year period. Specifically, we are systematically implementing measures such as improving the efficiency of equipment, inverter control, and measures related to natural and vaporization energy. In addition, we are optimizing factory operations in line with production volume changes.

No. Items Details
1 Enhancement of Equipment Efficiency Refrigerator replacement, optimal control
Compressor replacement, machine number control
Boiler replacement
Dry pump replacement
2 Motor Inverter Control (Rotation Control) Air-conditioner fan, various pumps
3 Natural Energy
Reuse of Energy
Vaporization Energy, etc.
Winter-free cooling
Waste heat recovery and reuse
Water spray humidification

Reduction of Greenhouse Gas Emissions

Renesas mainly uses Perfluoro Compound (Note 1) gas, one of the greenhouse gases, as a cleaning gas for reaction chambers in the semiconductor manufacturing process. These gases are not easily decomposed, and their global warming potential (Note 2) is high, ranging from about 7,000 to more than 20,000. Therefore, the reduction of these emissions is important, and we are actively working to prevent global warming by setting targets for reducing PFC gas emissions. Methods to reduce greenhouse gas emissions from PFC gas include 1) changing to smaller GWP gases, 2) reducing PFC gas usage by optimizing processes, and 3) installing detoxification equipment to decompose PFC gases. By combining these three methods, our group has been developing technologies to reduce its emissions target to 90% of the 1995 emission level or lower by 2010. Since 2010 we have continued our reduction efforts, despite structural reforms, and made a large reduction in 2015 where emissions were approximately 20% lower than the 1995 emission levels. Now that the structural reforms have been completed and we have entered into a growth phase, in 2020, compared to 2015, we achieved a 0.014 percentage point reduction in wafer area per unit of production and approximately 33% reduction in total emissions. Efforts will continue to be made to further reduce emissions beyond 2021.

Note 1: PFC; The semiconductor industry has declared emission reductions for CHF3, CF4, C2F6, C3F8, C4F8, SF6 and NF3
Note 2: GWP; a coefficient indicating how much a given mass of greenhouse gas is estimated to contribute to global warming (CO²=1)

GHG Emissions Reduction Image
Changes in PFC gas emissions and PFC gas emission per unit of wafer area
Perfluorocarbon (PFC) CF4 7,390
C2F6 12,200
C3F8 8,830
C4F8 10,300
Hydrofluorocarbon (HFC) CHF3 14,800
Sulfur hexafluoride (SF6) 22,800
Nitrogen trifluoride (NF3) 17,200

Seven PFC gases subject to reduction in the semiconductor industry and Global Warming Potential (GWP) (Note 3)

Note 3: 2006 IPCC Guidelines (IPCC: Intergovernmental Panel on Climate Change)

Environmental Measures in Logistics Operations 

In Japan we engage in logistics-related environmental activities (such as energy reduction for product and waste transportation, and the reduction and reuse of packaging materials).

In Japan, there are recommendations to reduce energy intensity against revenue under the Energy Conservation Law, and therefore all of our Japanese affiliates promote the reduction of transportation related CO² emissions. 

In 2020, we recorded 5,650,000 ton kilometers for the overall transport volume within Japan, a decrease of 1,160,000 ton kilometers from the previous year owing to the reduction of product related transportation by 1,150,000 ton kilometers. Additionally, the amount of waste transportation recorded was similar levels to the previous year. We will continue our efforts to reduce transportation energy in 2021.

Fiscal Year Transport Volume (10,000 ton-kilometers)
Product logistics Waste logistics Total (Japan)
2017 635 202 837
2018 533 191 724
2019 495 186 681
2020 380 185 565

Protecting the Ozone Layer

We have completely eliminated the use of ozone-depleting substances (ODS) that are listed in the Montreal Protocol, such as such as chlorofluorocarbons (CFC) and hydrochlorofluorocarbons (HCFC) from our manufacturing process. In addition, we are systematically reducing the amount of CFCs used as refrigerants in freezers, refrigerators, and air conditioners in accordance with the Montreal Protocol regulations and are switching to alternative substances. At the same time, we are meticulously respecting reduction measures by collecting ODS when the equipment in question is disposed of. We are also planning to replace any equipment that uses CFCs, from large scale freezers and compact refrigerators, to equipment that systematically uses refrigerants with a low depletion potential. In 2021, no equipment will be in operation and expect all equipment to be replaced in 2022.

Results of Renewable Energy Power Generation

At Renesas, we have installed solar panels at some factories to compensate for a portion of the electricity used for production.
In 2020, we generated 1,164 MWh of electricity.

Changes in renewable energy power generation

* The output in 2020 has decreased by about 50% from 2018, due to the suspension of some lines where solar panels are installed.

Tree Planting Initiative to Address Climate Change

In an effort to realize our aspiration to grow further as a sustainable company and become a company that gives something back to society, we made a donation to the international NGO Oxfam that supports global reforestation activities, embarking the planting of 20,000 trees worldwide in 2020, 20,000 being the number of employees at Renesas at that time.

We will continue to support and implement global climate change initiatives in the future.

Tree Planting Initiative to Address Climate Change


Contributing to SDGs

Renesas’ efforts in Climate Change Initiatives contributes to these Sustainable Development Goals targets:


7.2 By 2030, increase substantially the share of renewable energy in the global energy mix


9.4 By 2030, upgrade infrastructure and retrofit industries to make them sustainable, with increased resource-use efficiency and greater adoption of clean and environmentally-sound technologies and industrial processes, with all countries taking action in accordance with their respective capabilities


13.3 Improve education, awareness-raising and human and institutional capacity on climate change mitigation, adaptation, impact reduction and early warning