A travel power adapter system includes a base unit and a plurality of adapter assemblies. The base unit provides an integral prong configuration associated with an intrinsic electrical plug standard. Each adapter assembly provides a prong configuration associated with a different extrinsic electrical plug standard. The base unit provides a base recess that the integral prong configuration can pivot into in a nested condition. Each adapter assembly provides coupling sleeves dimensioned to slidably receive, in a first direction, the plurality of prongs in the nesting condition, forming an operative association between the base unit and the prong configuration of the adapter assembly, enabling an electrical connection to a receptacle or socket associated with the extrinsic electrical plug standard. The adapter assembly provides a locking unit that engages a locking slot of the base recess, thereby preventing the adapter assembly unintentionally moving in the reverse first direction.