Wärtsilä’s water consumption can be divided into two categories: domestic use and cooling use. Domestic water is mainly used for sanitary purposes and by industrial equipment, such as machine tools and washing machines. Some factories also use domestic water to produce moulds or to fill in closed-loop cooling system needs. Wärtsilä uses seawater for its engine and process cooling needs.

Total annual water consumption split by the water withdrawal source: About 99% of cooling water comes from local surface watercourses, where only heat is released along with clean water, and about 1% of cooling water comes from municipal water utilities. Out of Wärtsilä’s total water consumption in 2021, about 97% was seawater for cooling purposes, about 3% was from municipal water supplies, and about 0.3% was directly withdrawn groundwater or rainwater. 43,864 m3 , amounting to 0,4% of all water consumption took place in high water stress areas in accordance with the WRI Aqueduct classification.

Wärtsilä Sustainability graphs 2020 - Water