Core Viewpoint - An unusual trading incident occurred in the Hong Kong stock market involving Dongfang Electric, leading to significant price volatility and market attention [1][3]. Group 1: Incident Details - At 9:30:22 AM on July 21, an abnormal transaction for Dongfang Electric occurred at a price of 119.9 HKD per share for 400 shares, while the previous transaction was at 19.32 HKD per share, resulting in a 520% price surge [3]. - Following this transaction, the stock price quickly fell back to around 20.85 HKD per share, with an intraday peak increase of 703.62%, marking the largest single-day volatility in history for the stock [3]. - By midday, the stock's price increase narrowed to 77.28%, closing at 26.45 HKD per share [3]. Group 2: Market Context and Impact - The incident occurred shortly after the groundbreaking ceremony for the Yarlung Tsangpo River downstream hydropower project, which positively impacted related concept stocks, including Dongfang Electric, which saw a limit-up in A-shares [4]. - Dongfang Electric holds a 45% market share in the conventional hydropower market and a 41.6% share in the pumped storage market, positioning it as a leading hydropower equipment manufacturer in China [4]. - The total investment for the Yarlung Tsangpo project is approximately 1.2 trillion CNY, involving the construction of five tiered power stations [4]. - The "fat finger" incident is not unprecedented in the market, with a similar event involving Jinyue Holdings in May 2020, where a transaction caused an 826.32% price increase [4]. - Dongfang Electric's main business includes the development, design, manufacturing, and sales of complete power generation equipment across various energy sources, as well as providing engineering contracting and related services to global energy operators [4].