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Conserving Water

Due to the improvement of living standards owing to population increase and economic growth, the global demand for water is expected to further increase and the risks of depletion of water resources are becoming actualized. On the other hand, a large amount of water is essential in the semiconductor manufacturing process. If such water resources are depleted, not only can it cause production stagnation, but may impact procurement of raw materials. Renesas recognizes that water availability is a global issue, and we continue our efforts to reduce water consumption by managing water across all sites and offices while also recycling and saving water to give consideration to our impact on local ecosystems. In addition, we have contributed to creating forests that protect our water resources through planting trees as part of nurturing water resources and forest conservation activities that leads to the conservation of biodiversity.

Water Resource Conservation

In Japan we save water resources by actively recycling and reutilizing water. In 2019, the total amount of water used in our factories in Japan was 23,113 thousand m3, the annual amount of water supplied was 14,783 thousand m3, and the recycling rate was 36.0%.

Total water use and water recycle race

Risk Management for Water Resources

Evaluation of Water Risks in Manufacturing Sites

Evaluations of water risks in our manufacturing sites uses the World Resources Institute (WRI)’s WRI AQUEDUCT tool to determine regions that have high water related risks such as droughts.

As a result, in 2020, one of our manufacturing sites in China, a factory in Suzhou, was determined to be a region with high water risks. We will assess the situation and decide if preventative measures should be undertaken. In addition, the water intake of two factories located in China (Suzhou and Shanghai) were determined to be regions with high water stress (tight water demand and supply) was 340,593㎥ in total.

Changes in water intake and displacement of sites in China

  2017 2018 2019
Water Intake(㎥) 433,106 427,826 340,593
Water Displacement(㎥) 346,219 329,629 259,589

Yamaguchi Factory: Forests for Conserving Water

The Yamaguchi Prefecture in Japan is working to create a healthy and diverse range of forests in order to demonstrate the multi-faceted, sustainable effects of forests, such as the cultivation of water sources, the prevention of disasters in mountainous area, and the prevention of global warming. In order to support the forests which are shared by the Yamaguchi Prefecture and its inhabitants, the 12th “Activity to Develop Water-Protecting Forests” was held in November 2019 with the aim of promoting voluntary activities by corporations. A total of 199 employees and administrative officials from neighboring companies participated, and 8 employees from our Yamaguchi Factory also took part. In this activity, we prepared forests around the Akiyoshidai Kazokuryoko village, which is located north of our Yamaguchi factory and which is also a source of water for the Atsugashi River, which our factory takes water from for production use.

Yamaguchi Factory image01
Yamaguchi Factory image02
Yamaguchi Factory image03


Contributing to SDGs

Renesas’ efforts in Conserving Water contributes to these Sustainable Development Goals targets:


6.3 By 2030, improve water quality by reducing pollution, eliminating dumping and minimizing release of hazardous chemicals and materials, halving the proportion of untreated wastewater and substantially increasing recycling and safe reuse globally


6.B Support and strengthen the participation of local communities in improving water and sanitation management