The increasing emphasis on performing Environmental, Social and Governance (ESG) criteria has transformed corporate strategies to address climate risks and promote sustainability, especially in the energy sector. The existing literature on ESG reporting practices often overlooks regional peculiarities, particularly in countries such as Greece, where regulatory frameworks and organizational processes are evolving. This research examines the role of ESG performance in reducing climate risks and promoting business sustainability through a case study by a Greek energy supplier. It focuses on gaps in the existing literature on the challenges of adopting and implementing ESG criteria, offering a comparative analysis of priorities among corporate stakeholders. The methodology includes literature review, implementation of material analysis, and qualitative analysis of data from surveys and reports. The results show that adopting ESG strategies contributes substantially to sustainability by providing concrete recommendations to improve reporting processes and enhance transparency. Overall, the findings of the study offer new perspectives for improving ESG performance in Greek companies, underlining the importance of adapting practices at national level and enhancing compliance with international standards. Throughout the thesis the word ‘emissions’ refers to greenhouse gas emissions unless otherwise specified. In the thesis, tools such as Quilbot, Grammarly and ChatGPT were used for formatting purposes.