Abstract: The energy expenditure under power tiller and bullock farming systems was studied to explore the energy requirement at different stage of rice production and to find out the activity contributed major share of energy. Energy was divided into direct energy and indirect energy. Direct energy included labour, animal and fuel consumption obtained by multiplying energy coefficient. The indirect energy included machinery use, seed, fertilizer, pesticides etc. The direct and indirect energy constituted the total energy requirement expenditure for both farming systems. Intercultural operation was the highest consumer of labour both farming systems as this operation was done manually. In land preparation, power tiller farming system consumed 3 times more energy than bullock farming system but there was a saving of 58% time thus requiring less labour during peak periods. Transplanting operation required energy of 143 MJ ha-1 and 125 MJ ha-1 respectively for power tiller and bullock farming system. Fertilizer and irrigation consumed largest (47-50%) and second largest (21-25%) energy in both the farming systems. Bullock farming system consumed more labour energy (1448 MJ ha-1) than that of the power tiller farming system (1305 MJ ha-1). Total energy requirement under power tiller farming system was 15,751 MJ ha-1 whereas 13,781 MJ ha-1 was consumed under bullock farming system i.e. 17.74% higher energy input was used in power tiller farming system than that of bullock farming system. The grain yield under power tiller and bullock farming systems were 4.87 t ha-1 and 4.12 t ha-1 respectively. The energy ratio of 9.39 and 9.26 were achieved under power tiller and bullock farming systems respectively.