This study aimed at investigating factors influencing consumers’ choice of a supplier of solar energy in rural Tanzania, a case of Mwanza rural area. Objectives of the study were; to assess the influence of price on consumers’ choice of a supplier of solar energy in Mwanza rural area; to assess the influence of promotion on consumers’ choice of a supplier of solar energy in Mwanza rural area; to determine the influence of quality customer service on consumers’ choice of a supplier of solar energy in Mwanza rural area; to examine the influence of brand image of a supplier on consumers’ choice of a supplier of solar energy in Mwanza rural area; and to examine the influence of other customers on consumers’ choice of a supplier of solar energy in Mwanza rural area. The study used consumer theory which states the stages namely pre-purchase, service encounter and post purchase stages that a rational consumer goes through in purchasing a service. Data was collected using questionnaires from 310 respondents who are the consumers of solar energy supplied by JUMEME Solar Company within Ukerewe District. Both stratified and simple random sampling techniques were used to select a sample size of participants from the target population. Descriptive statistical methods, correlation and regression analyses were used to analyze the data. The findings of the study revealed that price, promotion and quality customer service have strong and positive influence on consumers’ choice of a supplier of solar energy in Mwanza rural area. The findings obtained from the study provide strategic knowledge to solar energy suppliers in rural Tanzania on how various factors such as price, promotion, quality customer service, brand image of a supplier and other customers influence consumers’ choice of a supplier of solar energy in rural Tanzania.