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Purpose: This study aims to explore students' sustainability attitudes and behavioural intentions and their relation to energy use, to promote energy saving and decarbonisation in higher education settings. Design/methodology/approach: The authors used a validated energy literacy survey to assess undergraduate students' attitudes and behavioural intentions towards energy saving in two countries (Brazil and Belgium). The questionnaire, administered online, comprised 23 Likert scale questions and three questions eliciting socio-demographic information. Results were analysed using a linear regression model and compared with previous research using the same energy literacy instrument. Findings: The research identified three dimensions of sustainable attitudes: citizens' role, scientists' role and government's role, explaining 65.5% of respondents' energy-related attitudes. Three dimensions of sustainable behaviours were identified, explaining 64.5% of energy-related behavioural intentions: consumption of eco-friendly products, financially driven behaviours and household energy saving. The linear regression model identified scientists' role, consumption of eco-friendly products and financially driven behaviour as the key predictors of student energy use. Differences between the two contexts also emerged. Research limitations/implications: Individual action to improve energy saving is necessary, but not sufficient for decarbonisation. However, student attitudes and behavioural intentions towards energy are an important element of campus decarbonisation: these "micro" experiments can become a "network" searching for synergies at the campus level (in collaboration with the neighbourhood) and act as a catalyst towards a more profound carbon-free society. Limitations of the research include the use of a survey to ascertain estimates of energy use; however, the study offers a model for further research and a mode of analysis that would be useful to other researchers. Practical implications: This research enables universities to better understand the drivers and barriers to student energy-saving activities and thereby promote decarbonisation on campus. This is a crucial underpinning in the creation of sustainable universities, linking education and campus developments. This survey was one of the catalysts to set up a total new maintenance energy performance contract (MEPC) at one of the authors' institutions, where energy efficiency was realised alongside other sustainability aspects, such as water saving, circular renovation and waste reduction. Social implications: This research illustrates the challenges and opportunities of working with key stakeholders in university settings for university-based decarbonisation efforts. Intensive involvement of students and teachers in the new MEPC offers an example of co-creation with building "users" -- which may have implications for other university building developments. Increasingly, universities need to consider the need for a new business model in which shared and multiple value creation is a key feature. Treating societal challenges as business opportunities is an important new dimension of corporate strategy and a powerful path to social progress, which higher education institutions should not overlook. Originality/value: Student attitudes and behavioural intentions towards energy are an important element of campus decarbonisation and can act as a catalyst towards a carbon-free society. Although energy literacy research has been undertaken in the USA and UK, this research is the first of its kind for Belgium and Brazil, and the mode of analysis -- using a linear regression model -- differs from the earlier work, offering a novel methodological approach.