Solid State Transformer (SST) is an energy router using advanced power electronics to intelligently manage, convert and route electricity between the utility grid and distributed energy resources (DER) such as PV, wind and storage. It directs energy from sources to loads, often managing both AC and DC connections simultaneously. It replaces conventional copper heavy magnetic transformer plus other energy routing equipment in a much smaller and lighter footprint. It also provides systen efficiency superior than that of traditional transformer at variable or partial load conditions. SST based system proviides advanced capabilities such as bidirectional power flow, voltage regulation, reactive power compensation and harmonic filtering, which are critical for smart grids and renewable energy integration.