Monteiro de Oliveira, AntonioMonteiro, EduardaSantos, Helena dosLima Rua, Orlando2026-03-062026-03-062023-12978-989-35072-1-6http://hdl.handle.net/10400.22/32013Adopting Post-positivism as a structural philosophical concept and Document Base Analysis as a quantitative methodology, this essay aims to demonstrate the evolution of sustainability Key Words on Annual Reports from 2001 to 2021 of Energias de Portugal (EDP), a Portuguese utility company that is involved in the generation, transmission, distribution, and sale of electricity and natural gas. Over the past two decades, corporations’ environmental concerns have been increasing in significance – thus sustainability reports have become more generalised. This generalisation opened a discussion about the transparency and credibility of the companies’ social reporting. The results allow us to establish that since up to 2001 the word sustainability had not been mentioned in any reports. In 2021 the word sustainability was mentioned 536 times but more important Annual Reports demonstrates EDP’s deep commitment to sustainability.engSustainability ReportSustainability EvolutionEnergias de Portugal – EDPtext