Defects and interfaces are the subjects of intense study in different contexts, as they provide useful probes quantum field theory and condensed-matter systems. In the case of two-dimensional conformal interfaces, universal properties are encoded in the flux of energy transmitted and reflected for an excitation scattering with the interface. I will first discuss the study of energy trasport across interfaces in the holographic setup, using the minimal holographic model of a brane in AdS3. I will then discuss the extension to a class of non-conformal defects obtained by turning on a TTbar-deformation of the CFT, as well as a class of defects obtained by allowing a time-reparametrization at the interface, corresponding to solutions of Nambu-Goto equation in the limit of a small tension brane. The latter setup can also be further generalized to multi-way junctions between CFTs.
