Efficient and well-developed power sector enables growth and boost of the economy, competitiveness of the national economy, affects the improvement of living standard of the population and development of society. In this respect, the basic task of the power sector is to ensure quality delivery of electricity to consumers that is secure and reliable, with optimal price of electricity and acceptable dynamics of delivery. Since the beginning of the 1980s until present time, the electric power sector has been facing a series of reforms and related restructuring processes aiming to improve the efficiency of the electricity market. This implies liberalisation and privatisation, and unbundling of power activities by which market competition is introduced in the production and supply of electricity. In the process of developing the power sector, it is necessary that the interests of preserving the environment for future generations are equally important as economic and energy interests of today's generations. In this regard, it is environmentally and economically justified to base the development of power systems on renewable energy sources. Increasing the share of renewable energy sources in the national electricity systems will contribute to an increase in energy and environmental efficiency in production and distribution of electricity and, consequently, energy sustainability of national economies. 1. Introduction From an economic standpoint, the energy sector enables performance of basic activities of companies, i.e. forms the basis for functioning and operations of companies and the economy as a whole. As one of the main resources of the present time, energy allows the exploitation of other resources in business cycles, fulfills the needs and satisfies the population in different aspects of life. Direct and indirect impacts of the power sector on the economy as a whole, and on the living habits of each individual are so strong and diverse that the power sector under the present circumstances determines the nature and intensity of the overall social and economic development. Development of the electricity system creates preconditions for a more efficient and cheaper production, which not only contributes to faster development of existing industries and activities, but also develops diversification of the economic structure of national economies.
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