Lean is a fundamental principle of waste reduction in business operations that also delivers. Lean energy efficiency means the elimination and reduction of energy consumption, cost reduction, optimisation of resource utilisation, and enhancement of operational processes. Embracing a lean transformation is crucial for organisations to gain a competitive edge. Therefore, this study aims to develop the conceptual model for lean energy efficiency and examine the impact of lean implementation towards energy efficiency in Malaysian companies. In addition, the study examines the mediating role of organisational culture in strengthening the relationship between lean practices and energy efficiency improvement and investigates the moderating effect of technology adoption in enhancing lean implementation and its subsequent impact on energy efficiency. Using a quantitative research design, this study will employ Structural Equation Modelling (SEM) to analyse the responses and outcomes. The study’s findings are expected to provide both theoretical and practical insights for industries seeking to integrate lean transformation with energy-efficient operations. This study will make a significant contribution to the Sustainable Development Goals (SDGs) through achieving substantial energy savings and promoting economic and environmental sustainability.