A cold plate comprising a plate body having a thermal conductive side; a plurality of parallel hollow fluid channels running inside the plate body; at least one fluid inlet in direct fluid communication with a first subset of the plurality of parallel hollow fluid channels; at least one fluid outlet in direct fluid communication with a second subset of the plurality of parallel hollow fluid channels; and a porous thermal conductive structure which is arranged inside the plate body to fluidly connect the first subset of the plurality of parallel hollow fluid channels to the second subset of the plurality of parallel hollow fluid channels, and which is in thermal contact with the thermal conductive side of the plate body, wherein the porous thermal conductive structure comprises a plurality of elongate fluid contact surface regions, each elongate fluid contact surface region extending continuously lengthwise along a longitudinal side of respective fluid channel for more than half a length of the longitudinal side to serve as a fluid interface between the porous thermal conductive structure and an interior volume of the respective hollow fluid channel; characterized in that the plate body comprises an inner cavity having a floor surface at the thermal conductive side of the plate body and an opposing ceiling surface with the plurality of parallel hollow fluid channels recessed into the ceiling surface, wherein the porous thermal conductive structure comprises a block structure with a base surface in engagement with the floor surface of the inner cavity and an opposite top surface in engagement with the ceiling surface of the inner cavity, and wherein the plurality of elongate fluid contact surface regions are on the top surface of the porous thermal conductive structure. a plate body having a thermal conductive side; a plurality of parallel hollow fluid channels running inside the plate body; at least one fluid inlet in direct fluid communication with a first subset of the plurality of parallel hollow fluid channels; at least one fluid outlet in direct fluid communication with a second subset of the plurality of parallel hollow fluid channels; and a porous thermal conductive structure which is arranged inside the plate body to fluidly connect the first subset of the plurality of parallel hollow fluid channels to the second subset of the plurality of parallel hollow fluid channels, and which is in thermal contact with the thermal conductive side of the plate body, wherein the porous thermal conductive structure comprises a plurality of elongate fluid contact surface regions, each elongate fluid contact surface region extending continuously lengthwise along a longitudinal side of respective fluid channel for more than half a length of the longitudinal side to serve as a fluid interface between the porous thermal conductive structure and an interior volume of the respective hollow fluid channel; characterized in that the plate body comprises an inner cavity having a floor surface at the thermal conductive side of the plate body and an opposing ceiling surface with the plurality of parallel hollow fluid channels recessed into the ceiling surface, wherein the porous thermal conductive structure comprises a block structure with a base surface in engagement with the floor surface of the inner cavity and an opposite top surface in engagement with the ceiling surface of the inner cavity, and wherein the plurality of elongate fluid contact surface regions are on the top surface of the porous thermal conductive structure.