This paper focuses on the concept of Corporate Social Responsibility (CSR) and its relationship with sustainability. The authors investigate the linkages between CSR and sustainability at both enterprise and country levels. The main focus of this study is the energy sector due to its importance in terms of economic, environmental, and social impacts. There are some doubts as to whether a socially responsible business meets public welfare expectations and fosters the country’s social and economic development, as well as the successful achievement of sustainable development objectives. However, it becomes apparent that the development of corporate social responsibility in the energy sector faces a plethora of challenges. Corruption is one of the most important challenges of sustainable energy development. The study analyzes the main areas of CSR policies where energy companies are expected to make a positive contribution to sustainable energy development: mitigation of environmental impact, economic and social development, and good governance. The authors argue that the corruption risks represent a very important issue that is hampering sustainable energy development, and CSR can be applied to mitigate these risks in the energy sector. In addition, government policies might be necessary to create a favorable environment for corruption risk mitigation. The study analyzes the main tools of corporate social responsibility in the energy sector and addresses the impact of CSR on the sustainability of energy sector and corruption risk mitigation. The study analyzes a corruption risk mitigation model in the energy sector and provides recommendations for strengthening corporate social responsibility and mitigating corruption risk. Our results show that CSR can play a vital role in dealing with corruption in the energy sector at the enterprise level. It becomes apparent that anti-corruption standards represent the main supporting means for achieving other CSR goals and principles. Therefore, mitigation of corruption risks should become a priority for socially responsible companies that are operating in the energy sector.