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The main purpose of this study is to describe Energy System Engineering students’ perceptions about renewable energy.  The paper mainly focuses what the engineering students’ know about renewable energy and developing their understanding on it. To determine students’ pre- and post-perceptions about renewable energy, firstly, the questionnaire was developed by the researcher. After conducting the questionnaire, the courses and seminar were prepared. Then, the differences of percentages between pre- and post perceptions were identified. This study found that although the students were in Energy System Engineering Department, they still had many misconceptions about renewable energy. Also, it was found that after the courses prepared by researcher many students handled their misconceptions and developed their knowledge about renewable energy. This study has demonstrated that even if Energy System Engineering students’ had many misconceptions about renewable energy, the perceptions, and misconceptions of students would be changed after taking courses.