[The power grid equipment sector fluctuated higher, Zhiguang Electric hit the daily limit] On September 21, the power grid equipment sector fluctuated higher in the afternoon, with Zhiguang Electric hitting the daily limit, Huatong Cable approaching the daily limit, and Future Electric, Xinhongtai, Kaifa Electric, Liangxin Co., Ltd., and Jinguan Electric leading the gains. In terms of news, CCTV Finance reported that since this year, solid-state transformers (SSTs), as core power equipment, have accelerated out of the laboratory and have been implemented in intelligent computing centers, heavy truck supercharging stations, and new distribution networks. Demonstration projects have continued to be rolled out, and the industrialization process has accelerated. 2026 is regarded as the first year of the development of solid-state transformers. Mass production is expected to begin around 2027, and it is expected to form a market worth hundreds of billions in the future.