A reliable future energy demand projection is a prerequisite condition for sustainable utilization of local energy resources of a country. The purpose of this study is to project and analyze the long term national energy demands of the country - Nepal. In this study, sector wise nation's energy demand model has been developed by incorporating available energy consumptions information of the country. For capturing the future energy demands, this study has considered four annual growth scenarios of national economy along with changing demographic situations of the country. Among the selected growth scenarios, the medium growth scenario has been selected for further policy interventions on the residential and industrial sectors of the country. The finding from this research provides the evidence that in all of the projected scenarios, residential sector will be the main energy demanding sector, followed by transport, industrial, commercial, agricultural and others respectively. In coming years, the share of national demand of solid biomass will be decreased, while the demanding shares of petroleum products, electricity, coal and biogas will be increased in all of the projected scenarios. Among the fuels, the growth rates of the petroleum products will be the highest, followed by electricity, biogas and coal. It has also been observed that for the highest growth scenario, the demand of solid biomass will be decreased more rapidly in comparison with the other growth scenarios. The projected national level energy indicators like per capita electricity consumption, per capita total energy consumption, shares of sectoral energy demand and structure of demanding fuels shares will be the useful parameters for comparing and planning of local energy resources of the country. If the mentioned policy scenario on the residential sector will be followed then annually, a significant amount of reliable local electricity demand will be generated within the country. Similarly, in the industrial sector, the study has also figured out that the quantities of energy can be saved through the implementation of the suggested sectoral policy measures of the country.