This chapter explores the application of the Engel, Kollat, and Blackwell (EKB) decision-making model for household energy transition decisions, emphasizing its adaptability to the complexities of this process, which is influenced by numerous individual and social factors. Leveraging the flexibility of the EKB model, the chapter demonstrates how the decision-making process related to household energy transition can be systematically decomposed into distinct stages: need recognition, information search, evaluation of alternatives, purchase decision, and post-purchase evaluation. By applying the EKB model to this domain, the chapter offers a comprehensive analytical framework for identifying consumer motivations, perceived barriers, and the dynamic mechanisms underlying energy-related choices. This application of the EKB model advances the theoretical understanding of household decision-making in energy transitions and supports the formulation of evidence-based behavioral and policy interventions.