This study aims to explore the environmental justice aspect of the renewable energy aid provided to developing countries from the Official Development Assistance (ODA) program of the Organization for Economic Cooperation and Development (OECD). The study analyzes the factors influencing the ODA program (budget), which is implemented by OECD’s Development Assistance Committee (DAC). For this analysis, we constructed a panel data set of 25 OECD/DAC member countries that provided renewable energy aid from 2002 to 2021, using two explanatory variable groups, ODA and non-ODA sectors. For the empirical analysis, we adopted a fixed-effect model and a random-effect model. Also used was a panel model of generalized least squares (GLS) and a panel corrected standard error (PCSE) model, which takes into account both autocorrelation and heteroskedasticity. The analysis based on the panel GLS and PCSE models finds that, in the ODA sector, the environment and energy policy aid, and, in the non-ODA sector, the renewable energy supply ratio, the proportion of Green Party members in the donor countries’ national assemblies, and the proportion of environmental taxes in their gross domestic products (GDPs) have a significant influence on ODA renewable energy aid. The implications of the study reveal the following needs: (1) rechecking donor countries’ policies related to the environment from the standpoint of environmental justice, (2) standardizing the principle of environmental justice in renewable energy initiatives globally, (3) redefining the value of environmental aid in response to the