With the increasing number of older people in the world and their interest in education, universities play an important role in providing effective learning methodologies. This paper presents a new instructional methodology implementing inquiry-based learning (IBL) in two courses focused on alternative energies in the Program for Older People at the University of Lleida (UdL) in Spain. The instructional methodology is evaluated and results are discussed after two years of studies. The instructional methodology presented in this paper helped students to build and reinforce scientific skills and knowledge construction. This work may have potential relevance to other instructors involved in adult education. (Contains 3 figures and 3 tables.)