The research explores the potential of utilizing lemon myrtle waste (LMW) for the production of valuable energy resources such as biochar, bio-oil and biogasthrough the modification of lemon myrtle activated carbon as a catalyst. The study focuses on transforming the residual lemon myrtle biomass from the crude oil extraction process into valuable energy resource especially biochar. Acid, base, and metal doping treatments and synthesis were subjected onto the activated carbon to produce various modified activated carbon catalyst to be used in biochar production from LMW through microwave-assisted catalytic pyrolysis (MACP). Addition of modified activated carbon catalyst, TACA-NiO to LMW feedstock during the MACP process demonstrated maximized yield of biochar with 46.26% yield with highest carbon content of 64.3% indicating to the synergistic effect of NiO and activated carbon as catalyst support. Additionally, the Sulphur content of this TACA-NiO biochar is comparable to thecommercial coal, measuring at 0.426%. Meanwhile, bio-oil yield reached its peak at 29.93% when using TACB catalyst and the highest biogas yield, recorded at 49.39%, was achieved by utilizing UAC as the catalyst. Pure LMW biochar was discovered to have the highest calorific value of 24.72 MJ/kg. This study positioned lemon myrtle biochar as a viable alternative to traditional fossil fuels that contributes to the reducing of greenhouse gas emissions and promoting renewable energy sources.