Information security management system (ISMS) is a systematic process for creating, implementing, ensuring the functioning, maintaining and developing the information safety at an organization to achieve its business goals. In March 2016, the General Director made a decision to implement the information security management system that world-class best practicies at PJSC “Donbasenergo”. The purpose of the ISMS implementation and maintenance is to ensure safety of the Company’s economic activity as the guarantee of fulfilled obligations to the state, partners, and employees by means of efficient protection of business processes.