Shares of Chinese electricity and grid equipment makers surged after State Grid unveiled a 4 trillion yuan (US$574 billion) plan to upgrade the country’s power networks, as surging demand and the global race in artificial intelligence drive investment in energy infrastructure. Transformer makers Sieyuan Electric and Shanghai Guangdian Electric triggered the trading halt mechanism after surging 10 per cent on Friday morning. At least 11 mainland-listed companies rose 10 per cent or more in the...