Rundian Energy Science and Technology Co., Ltd. Change Announcement for Special Testing of High Voltage Electrical Equipment for 2025-2027 Change Announcement No.: DLBGGG202506200001 The special testing announcement for high voltage electrical equipment for 2025-2027 (Project No.: 6RDNK020250600005) issued by our company on June 10, 2025, has been changed as follows: the deadline for quotation before and after the type change is 17:00:00 on June 20, 2025, and the deadline for supplier inquiries is 17:00:00 on June 21, 2025, and 17:00:00 on June 18, 2025, and 12:00:00 on June 20, 2025. Except for the above changes, the rest of the original announcement is still valid. Rundian Energy Science and Technology Co., Ltd. June 20, 2025