Dr. Alex Huang and SPEC alumni Dr. Zhicheng Guo (now assistant professor at Arizona State University) gives a tutorial presentation at ECCE 2024 in Phoenix, Arizona. Their topic involves the latest development and new technology trends in solid state transformer (SST). Solid-state transformer (SST) technology is involved considerably in recent years thanks to the new semiconductors technology, the large efforts to improve magnetics designs, and intensive research in power converter design optimization. Moreover, new applications and trends emerge for SST. This tutorial covers the latest developments in SST from the system level (power converter topologies and architectures) to the components level (power semiconductor technology, and magnetic components), in which the technology status and the actual state of the art are emphasized. Besides, the latest work about IEEE standards for SST and the SST projects utilized in clean energy and next-generation flexible and adaptable large power transformers is discussed.