A power connector assembly includes a first connector (100) having a first insulating housing (110) forming a front face (114) and a rear face (115). A number of passageways (101) are defined in the first insulating housing and extending through the front face and the rear face. A number of first contacts (120) are retained in the passageways, respectively. A second connector (200) includes a second insulating housing (210) having a front surface (214) and a rear surface (215). A number of passageways (201) are defined in the second insulating housing and extending through the front surface and the rear surface. A number of second contacts (220) are retained in the passageways, respectively. When the first connector and the second connector are mated with each other along a mating direction, a number of airflow holes (102) are defined between the front face of the first connector and the front surface of the second connector for heat dissipation.