Abstract
The accumulation of energy in the power system is necessary in order to harmonize the power of production with the power of consumption and to maintain the stability of the supply of electricity. The necessity of energy accumulation is particularly pronounced in power systems with a greater share of solar and wind power plants, whose power generation strongly depends on weather conditions. The accumulation of energy enables fast primary and secondary regulation of the generated power, while in the case of larger accumulations it can also participate in tertiary regulation. A fully developed technology with extensive exploitation experience for the accumulation of energy in the power system, both in the world and in Serbia, is the application of pumped hydroelectric energy storage plants. The paper analyses previous experiences in the application of pumped hydroelectric energy storage plants, as well as some newer technical solutions aimed at maximum utilization of natural potentials for the accumulation of hydropower. In addition, given that Serbia is one of the countries in the world with a large share of electricity production from coal, some of the modern solutions for energy accumulation within thermal power plants are also considered.
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