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Stock Code: 200771 Stock ID: Hangqilun B Announcement No.：2023-44 Hangzhou Steam Turbine Power Group Co., Ltd. Announcement on participating in the collective performance briefing of the listing hall of the Shenzhen Stock Exchange The members of the Board and the Company acknowledge being responsible for the truthfulness, accuracy, and completeness of the announcement. Not any false record, misleading statement or significant omission carried in this announcement. Hangzhou Steam Turbine Power Group Co., Ltd(hereinafter referred to as the "Company") has disclosed its 2022 annual report on March 29, 2023. In order to further strengthen the communication between the Company and investors, promote investors to have an in-depth understanding of the Company"s operation, future development strategy, etc., the Company will participate in the "Listing Hall" collective performance briefing namely the 2022 collective performance briefing of Zhejiang state-owned listed companies with the theme of "Local State-owned Enterprises Rejuvenated - Looking at State-owned Enterprises in Zhejiang" jointly organized by the State-owned Assets Supervision and Administration Commission of Zhejiang Province and the Shenzhen Stock Exchange , and there will be interactive exchanges with investors on the Company"s 2022 annual performance. The relevant matters are hereby announced as follows: I. Arrangements for this performance briefing 1. Time: May 17, 2023 (Wednesday) from 15:00 to 17:40 2. Address: Shenzhen Stock Exchange Listing Hall 3. Holding method: graphic and live video broadcast 4. Attendees: Chairman Mr. Zheng Bin, Independent Director Mr. Xu Yongbin, Deputy General Manager and Deputy Chief Accountant Mr. Zhao Jiamao, Deputy General Manager and Secretary of the Board of Directors Ms. Li Guiwen. 5. Investor participation method: log in to the "Interactive Easy" platform (http://irm.cninfo.com.cn) of the Shenzhen Stock Exchange, enter the "Cloud Interview" column to participate in this performance briefing, or scan the QR code below to watch the live broadcast and participate in the exchange. II. Investor Question Collection Methods

In order to fully respect investors and enhance the pertinence of communication, we hereby solicit relevant questions from investors in advance for this performance briefing, and widely listen to investors" opinions and suggestions. Investors can log in to the "Cloud Interview" column

of the "Interactive Easy" platform in advance or scan the QR code to enter the Company"s performance briefing page to ask questions. The Company will answer questions of general concern by investors at the performance briefing. Investors are welcome to actively participate in.

This announcement is hereby made.

The Board of Directors of Hangzhou Steam Turbine Power Group Co., Ltd. May 11, 2023