Abstract
The paper analyses the current state of energy and the environment in the regions where the Russian largest HPP cascades are located – Volga region and Siberia. The effect of various limitations on HPP operations (power systems and water users restrictions, deviations from design operation characteristics) and resulting excess load at TPP are estimated. The environmental impact assessment (reducing emissions of pollutants and greenhouse gases in energy systems assuming maximum hydropower generation) is conducted. It is shown, that actions to increase HPPs usage efficiency (construction of new transmission lines, raising water reservoir level to level established by HPP design, enhancement of basic rules of water resources use) can save 3 million tce of fossil fuel annually and decrease emissions of air pollutants by 50 thousand tons and of carbon dioxide by 6 million tons annually
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