Pumped-accumulation hydro electric station in electrical energetic system of the Republic of Macedonia

The production of the Electric Power Co. of Macedonia (EES) is based on a lignite thermoelectric power stations, which participate whit about 80% of the total electric power generation, and the rest part is covered whit the hydroelectric power stations, TPP of oil - Negotino or from an import. TPP Bitola and TPP Oslomej in the last years already come to the maximum necessary production while the TPP Negotino's work depends on the both crude oil price and the hydrological conditions. The existing hydro-power stations, depending of the hydrological conditions, cover from 10% to 20% of the electrical energy necessities in the country. Taking into consideration these data, as well as the energy potential of Macedonia, it is necessary to make a proper choice for future development of the production capacities in EES. Hydropower of Macedonia is limited with a few water flows which can contribute much more. This paper presents the role of hydro-objects Galishte and Chebren as pumped-accumulations into the EES of Macedonia. Located downstream from the HPP Tikvesh at the river Crna, this hydro-objects have all natural conditions to work as a pumped accumulation HPPs, whit which the hydro-energetic potential of the river Crna would be used to its maximum. (Original)