Prof. Amadei gave a lot of inputs about the paper. He also asked about renewable energy in Indonesia, how the government manage all the islands. He gave us his books and asked me to read that books, especially in some chapter of the ""Engineering for sustainable human development: a guide to successful small-scale community projects"" book. In this mentoring, objectives and sampling location already agreed. But for the method, Prof. Amadei already give me the flow of researhc method, and I need to read more references.