On September 20, China marked a significant milestone with the official commissioning of the Xiquan Substation in Liaoning—the nation's inaugural new-generation 500 kV substation that is entirely independently developed and controllable. This groundbreaking substation represents the first instance of complete localization across the entire supply chain for electrical and protective equipment. This encompasses everything from essential materials and pivotal chips to operating systems, databases, and even the formulation of technical standard systems. Its implementation substantially bolsters grid security and amplifies the capacity for new energy transmission in northern Liaoning.