PTI’s plants in the Hukou area (P2, 3A, 3C, 3D, P9 and P10) are mainly supplied by Shihmen Reservoir and the Touqian River, while the Hsinpu Plant (P1) and the HSP Plants (P8, P11A and P11B) are mainly supplied by Baoshan Reservoirs 1 and 2 (freshwater sources). The water is sourced from the public water utility and groundwater. Although the sites are not located in water-stressed areas, water use may still have broader impacts on local living standards. Accordingly, PTI places emphasis on compliance with applicable government regulations related to water withdrawal and discharge.

To better understand and mitigate water-related risks, we utilize the World Resources Institute (WRI) water risk assessment tool (Aqueduct Water Risk Atlas) to assess water stress and risk levels for its operating locations. Findings indicate that all 10 operating sites are located in areas with low to medium water stress. In response to rapidly changing water environments driven by climate change, such as more frequent droughts and flooding, we have adopted a proactive water management approach based on three core strategies: reduction, reuse, and recycling. These strategies aim to improve water use efficiency and reinforce ongoing conservation measures across all operating sites.

Water Governance

PTI has established a comprehensive water risk identification and response framework, guided by a “top-down command and supervision, bottom-up feedback and adaptation” structure to ensure operational effectiveness in water governance. In 2024, we successfully obtained ISO 46001 certification for water efficiency management, further enhancing the effectiveness of our water resource strategies.

On an annual basis, we conduct climate-related risk and opportunity assessments in alignment with the Task Force on Climate-related Financial Disclosures (TCFD). Cross-functional committees regularly review the implementation status of key topics such as sustainability and water management, with findings reported to the Board of Directors. These governance practices continually reinforce organizational resilience in managing water-related challenges. (Please refer to the 2025 TCFD Report for details on water management in practice.)
 

Process Water Conservation – Dicing/Grinding Recycling Water System Efficiency

PTI has actively implemented process wastewater recycling in plants by applying a UF (Ultra-filtration) system to filter out insoluble solids through the hollow fiber membrane, to steadily recycle and re-use the wastewater from the dicing and grinding process.

For plants with dicing and grinding processes, we have installed wastewater recycling systems to enhance water resource efficiency. These systems have been implemented at the Hukou Plant (P2), Datong Plant (3A and 3C), HSP Plant 1 (P8), and HSP Plant 3 (P11B), with equipment capacity estimated based on each production line's demand. To align with production capacity planning, the recycling systems continue to be expanded and upgraded with high-reliability and easy-to-maintain key components, ensuring stable improvements in recycled water volume and equipment performance.

From 2018 to 2025, the recycling systems achieved consistent effectiveness, maintaining a recycling rate exceeding the target of 85%. In 2025, the recovery rate of PTI’s process water recovery systems was 88.30%. Total recovered process water amounted to 1,556.691 megaliters, an increase of 28.194 megaliters (approximately 1.84%) compared with 2024, primarily due to adjustments in process planning.