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Annual performance
The Company has continued to demonstrate a strong commitment to environmental management and sustainable governance, responding to global climate action demands with tangible results. During the year, the Company conducted a comprehensive group-wide greenhouse gas inventory and obtained external third-party verification, ensuring data transparency and reliability, and laying a solid foundation for the formulation of subsequent carbon reduction strategies and performance tracking.
In terms of energy transition, the group-wide proportion of green electricity usage increased to 42.19%, with a total of 17.55 million kWh of renewable energy adopted, effectively reducing the Company’s operational carbon footprint and supporting the development of the renewable energy market. Water resource management also achieved measurable results: compared with the 2022 baseline year, total group-wide water withdrawal decreased by 46.76 million liters, representing a reduction of 15%, reflecting the Company’s continuous efforts to enhance process efficiency and water recycling and reuse. In addition, compared with the baseline year, group-wide Scope 1 and Scope 2 greenhouse gas emissions were reduced by 9,037 metric tons of CO₂-equivalent, a reduction of as much as 37%, demonstrating significant achievements through the adoption of energy-saving technologies, equipment improvements, and the use of green electricity.
The Company also continues to maintain IECQ QC 080000 certification, demonstrating high standards in hazardous substance management and the implementation of comprehensive controls across design, procurement, and manufacturing processes. Overall, through systematic management and continuous innovation, the Company is steadily advancing the reduction of its environmental footprint and taking more resilient steps toward sustainable operations.
42.19 %
Renewable electricity ratio
46.76 million liters
Water withdrawal reduction
9037 tCO₂e
Category 1, Category 2 greenhouse gas emission reduction
Inventory Methodology
Sunon follows the ISO 14064-1:2018 greenhouse gas inventory standard, adopts the operational control approach to set the organizational boundary, and refers to the significance of indirect emission sources based on external disclosure requirements, the degree of controllability by the Company, the data quantification method, and the availability of coefficients to determine whether categories 2 to 6 should be included in the inventory. The inventory is verified by an external third party. Since 2022, the Company conducts an annual greenhouse gas inventory to regularly assess and control the organization's greenhouse gas emissions.
This year, the organizational boundary includes all sites, and the reporting boundary includes category 1 (stationary combustion, mobile combustion, fugitive emissions, process emissions), category 2 (purchased electricity), category 3 (upstream transportation, business travel), and category 4 (product procurement, purchased fuels and energy resources, waste treatment and transportation). Categories 5 and 6 were identified as non-significant emission sources through the significance assessment criteria of the greenhouse gas inventory, so they were not included in this year's inventory. Greenhouse gas types include carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), hydrofluorocarbons (HFCₛ), perfluorocarbons (PFCₛ), sulfur hexafluoride (SF₆) and nitrogen trifluoride (NF₃), a total of 7 greenhouse gases.
We mainly adopt the emission factor approach for calculation, multiplying activity data by the emission factor and global warming potential (GWP) to convert it into carbon dioxide equivalent (CO₂e) in metric tons (tCO₂e). We also select the appropriate emission factor source according to the emission type, including the latest "Greenhouse Gas Emission Factor Management Table" (Version 6.0.4) announced by the Ministry of Environment of the Executive Yuan, the latest annual electricity carbon emission factor announced by local governments, the emission factor announced by the IPCC, etc.; The GWP value is based on the value announced by the IPCC (IPCC 6th Assessment Report).