Increased energy demand, acceleration of renewable energy, and response to climate change are global challenges that are being faced today. To overcome this, education for sustainable development (ESD) is a concept that can be implemented through the renewable energy learning project (RELP) in physics lessons. This study analyzes the project-based learning on the RELP concept and its influence on project design, communication, and critical thinking skills. By using a one-shot case study method on 37 high school students divided into five groups, two types of renewable energy works were created: solar and wind. The results found that the students had the above three skills in the high category. Additionally, project design and communication skills significantly influenced critical thinking. This research implies providing a project-based physics learning concept relevant to 21st-century skills while achieving ESD.