The inadequate power supply in Nigeria has resulted into the use of diesel/petrol generator by almost every household. The implicating death and health risk recorded has made sustainable alternative sources imperative. Solar energy has been identified as a viable option; however, the greatest challenge is its affordability due to high installation cost. This paper proposes the installation of solar energy system using energy partitioning approach based on scalable level of importance to quality of life. First, household energy utilization is partitioned into different energy sectors, and then the importance of each sector as it affects the basic quality of life of the intending users are determined using structured questionnaire. Using a typical medium income house as a case study, different analyses are performed based on the level of quality of life that can be afforded by the different users. The result reveals that the life cycle cost over a period of 20yr, of solar energy system for level 1 (Lighting only) which has the highest impact on the quality of life of Nigerian is $10,600. The cost of energy is 0.3341$/kWh, the cost of diesel fuel saved 1380$/annum, the break-even point is 7.7yr and the estimated carbon credit is 1095.7kg/yr.