The DC and microwave power-performance of metal organic chemical vapour deposition-grown AlGaN/GaN HEMTs on SiC substrate is reported. The devices exhibited high maximum cur-rent density of 1.1 A/mm with high peak extrinsic transconductance of 234 mS/mm. At 26 GHz, the devices achieved continuous-wave (CW) power density of 5 W/min with power-added-efficiency of 30.1 %, which represents the highest Output power density and associated power-added efficiency reported above 20 GHz.