T his study aimed at developing concepts of green energy among second graders at the prep stage and their attitudes towards it. The sample of the study included 50 female students in second grade of the prep stage. Instruments of the study included a test of green energy concepts and a scale of attitudes towards green energy and its applications. The instruments were administered to the sample, and then a unit on green energy was taught to them. After that, the instruments were administered to the sample again. The results of the study showed the effectiveness of the suggested unit “Green Energy" and that it had a great effect on the sample's acquisition of the green energy concepts and attitudes towards it. The study recommended that the  role of the Science curricula should be activated in achieving the aims of green energy as a main goal of teaching Science at the different educational stages. The study also recommended providing the students with enough information and skills about green energy and its applications for developing awareness and attitudes towards it.