This paper presents the learning outcomes, syllabus, delivery, and assessment strategy for a module of 'Sustainable energy systems' for master-level engineering students. The paper is based on three stages of 'action research.' The first stage is a critical reflection on the planning and the process, based on the experience in delivering the original module and literature review. The second stage is based on semi-structured interviews of 4 th -year students, focused on the collection of feedback to improve the module. The third stage is the redesign and peer-review of the module. The key outcome of this work is an approach which further enables students to move from 'surface learning' to a more profound 'deep learning'. Further steps forward toward a true 'constructivism' are also envisaged.Several enhancements are discussed, including an improved syllabus, new methods of delivery, finetuning of the learning outcomes, and finally revisiting the assessment strategy. The holistic teaching of 'Sustainable energy systems' is becoming commonplace in higher education engineering courses.Other lecturers planning or delivering a masters-level module on the topic of 'Sustainable energy systems' can gain practical and useful insights for their teaching from this paper.