Public relations is described as two-way communication between an organization and its internal organizational members and external publics, obtaining mutual understanding, developing social responsibility, and substantiating mutual interests. The role of public relations is to ensure long-term goals in creating a positive image based on building relationships between consumers, suppliers, employees, the Government and other formal and informal social groups. Nowadays, big companies are faced with numerous questions and organizational problems that are difficult to answer so they don't take the time to work on creating and balancing a good working environment. Therefore, every company has a separate management function called Public Relations. Public relations certainly play a role in establishing, obtaining, understanding, and accepting mutual communication between big companies like HEP d.d. and its publics. The main role of public relations in helping the management is constantly informing them about public opinion and how to act in compliance with it. Furthermore, public relations define and emphasize the management's responsibilities and duly inform them about trend forecasts so the management could adapt accordingly and keep up with the changes for effective utilization. Marketing communication includes all promotional activities such as propaganda, promotion, publicity, personal sales, and communicating the functional elements of the marketing mix. The purpose of marketing communication is developing and obtaining demand for a certain product and/or service. Every companies business success depends on effectively communicating the value of the product to potential consumers. A marketing mix is used by every organization in achieving the required marketing goals. The marketing mix includes a combination of marketing communication tools and analyzes marketing strategy elements.