Upgrade of CRP (Control and Relay Panel) and Related Subsystems at Substations ATP0 ~ ATP5

1.Name and nature of the underlying asset (e.g., land located at Sublot XX, Lot XX, North District, Taichung City):
   Upgrade of CRP (Control and Relay Panel) and Related Subsystems at Substations ATP0 ~ ATP5
2.Date of occurrence of the event: 2025/12/10
3.Date of the board of directors resolution: 2025/12/10
4.Other approval date: Not applicable.
5.Transaction unit amount (e.g.XX square meters, equivalent to XX ping), unit price, and total transaction price:
  (1) Unit amount: Not applicable
  (2) Unit price: Not applicable
  (3) Total transaction price: 684 million NTD (Tax inclusive)
6.Trading counterparty and its relationship with the Company (if the trading counterparty is a natural person and furthermore is not a
    related party of  the Company, the name of the trading counterparty is not required to be disclosed):
    INFOCHAMP SYSTEMS CORPORATION, which is a related party of THSRC
7.Where the trading counterparty is a related party, announcement shall also be made of the reason for choosing the related party as
    trading counterparty  and the identity of the previous owner, its relationship with the Company and the trading counterparty, and
    the previous date and monetary amount of transfer: 
     (1) Reason for choosing the related party as trading counterpart: Trading counterpart was selected through Selective Tendering
           process where the most favorable  bid was chosen. The Procurement Committee scored the basic  qualifications, service
           proposals, and pricing rationale of the corporate bidders, with the highest-ranking bidder selected as trading counterpart.
     (2) Identity of the previous owner: Not applicable.
8.Where an owner of the underlying assets within the past five years has been a related party of the Company, the announcement
    shall also include the date and price of acquisition and disposal by the related party, and its relationship with the Company at the
    time of the transaction: Not applicable.
9.Projected gain (or loss) through disposal (not applicable for acquisition of assets; those with deferral should provide a table
    explaining recognition): Not applicable.
10.Terms of delivery or payment (including payment period and monetary amount), restrictive covenants in the contract, and other
      important terms and conditions:
     (1) Terms of delivery and payment to be carried out in accordance with contract; restrictive covenants in said contracts: none; 
     (2) other important stipulations: none.
11.The manner of deciding on this transaction (such as invitation to tender, price comparison, or price negotiation), the reference
      basis for the decision on price,  and the decision-making unit:
     (1) The manner of deciding on this transaction and the reference basis for the decision on price: Conducted in accordance with
            THSRC internal procedures for price inquiry, comparison, and negotiation.
     (2) Decision-making department: Board of Directors.
12.Name of the professional appraisal firm or company and its appraisal price: Not applicable.
13.Name of the professional appraiser:  Not applicable.
14.Practice certificate number of the professional appraiser: Not applicable.
15.The appraisal report has a limited price, specific price, or special price: Not applicable.
16.An appraisal report has not yet been obtained: Not applicable.
17.Reason for an appraisal report not being obtained: Not applicable.
18.Reason for any significant discrepancy with the appraisal reports and opinion of the CPA: Not applicable.
19.Name of the CPA firm: Not applicable.
20.Name of the CPA: Not applicable.
21.Practice certificate number of the CPA: Not applicable.
22.Broker and broker's fee: Not applicable.
23.Concrete purpose or use of the acquisition or disposal: Upgrade hardware and software of Control and Relay Panel to improve
      system performance and spend less time on troubleshooting  of equipment faults. 
24.Any dissenting opinions of directors to the present transaction: None.
25.Whether the counterparty of the current transaction is a related party: Yes.
26.Date of ratification by supervisors or approval by the audit committee: 2025/12/09
27.The transaction is to acquire a real property or right-of-use asset from a related party: No.
28.The price assessed in accordance with the Article 16 of the Regulations Governing the Acquisition and Disposal of Assets by
      Public Companies: Not applicable.
29.Where the above assessed price is lower than the transaction price, the price assessed in accordance with the Article 17 of the
      same regulations: Not applicable.
30.Date on which material information regarding the same event Ahas been previously released: NA
31.Any other matters that need to be specified: Approved by the 10th Board of Directors at the 34th Board Meeting held Dec.10, 2025.