This study focused on integrating energy-saving education within the realms of natural science and religious, aligning with Islamic environmental values. Specifically, the aim was to create a teaching framework for instilling energy-saving values in Islamic secondary schools, integrating with the boarding school system (pesantren) guided by Islamic ethical principles. This research employed a descriptive case study approach in two Islamic school locations within Bandung Regency. Qualitative data were collected and analyzed using NVivo 12. Initially, a rich picture was used to depict the program’s setting, identify issues, and assimilate energy-saving Islamic values. The result was the synthesis of a triangular model, illustrating the internalization of Islamic ethical values related to energy conservation across science, religious subjects, and daily school activities. This model serves as a viable solution, particularly for Asian countries such as Indonesia, where the education system intertwines religious and scientific education in their curriculum, fostering students’ ecological awareness. The findings emphasize the need for competent educational stakeholders capable of innovatively integrating religion and science, possessing a solid understanding of energy conservation, to effectively implement these programs.