This study was undertaken to investigate the impact of power (electricity) supply on the performance of small and medium scale enterprises in Mubi. Primary data were used and the data were generated through questionnaire. The questionnaires were coded and the variables used are the monthly turnover of small and medium scale enterprises in Mubi, KV supplied to SMEs by the power distribution company in Mubi, number of employees, tax, wages and salaries, years of business and the expenditure on alternative power supply. Monthly turnover was used as a proxy to performance while KV was used to proxy power supply. The study employed descriptive analysis, correlation analysis as well as the regression analysis. The results of the analyses revealed that power supply and the performance of small and medium scale enterprises are negatively correlated. However, the regression result showed that power electricity supply has a positive impact on the performance of small and medium scale enterprises in Mubi. The study recommended among others, that stable electricity supply should be provided to enable the young businesses survive and grow.