This study was conducted to investigate the effects of dietary energy levels on the performance and fat deposition of Wooirmatdag (WRMD) chickens. A total of 640 birds, consisting of 320 WRMD No. 1 (WRMD1) and 320 WRMD No. 2 (WRMD2), were assigned to four dietary groups with five replicates of 16 birds per replicate. The dietary groups were formulated based on a standard metabolizable energy (SME) level (3,025 kcal/kg for the starter phase, 3,100 kcal/kg for the grower phase, and 3,150 kcal/kg for the finisher phase), with three variations: SME-200, SME-100, and SME+100. The results showed that the feed intake (FI) and feed conversion ratio (FCR) of WRMD1 were significantly (P<0.05) lower in the SME and SME+100 groups compared to the SME-200 and SME-100 groups. In WRMD2, body weight and weight gain were significantly higher (P<0.05) in the SME and SME+100 groups compared to the SME-200 group. Additionally, the SME and SME+100 groups exhibited lower (P<0.05) FI and FCR compared to the SME-200 and SME-100 groups. Although the abdominal fat ratio of both WRMD1 and WRMD2 increased (P<0.05) with higher dietary energy levels, there was no significant effect on the fat content of breast meat. In conclusion, the energy requirements of WRMD chickens are estimated to align with the SME levels used.