In rural Ethiopian traditional fuels like kerosene and firewood are the main sources of energy used for lighting purpose. They are a major factor for environmental problems and health risks that affect the wellbeing of low-income rural households. However, Ethiopia has a vast potential for renewable energy resources like solar energy that have not fully utilized. The main aim of the study was to assess the determinants of household adoption of solar energy in the Gurage zone. In order to achieve the objective of the study, data were collected from 384 households using a survey questionnaire from Cheha and Ezha woredas. The collected survey data were analyzed by descriptive statistics and econometric model (probit model). The result of the probit model reveals that the adoption of solar energy has a positive and significant relation with household income, remittances, education, marital status and ownership of cattle