The Nosice hydroelectric power plant is a dam-type hydroelectric power plant and its reservoir performs the function of flow rate weekly balancing. The water used drainsnear the town of Púchov into the Dolné Kočkovce reservoir that is part of the oldest HPP cascade on the Váh river. However the Dolné Kočkovce reservoir has a relatively low retention capacity and the downstream HPP a relatively high maximum usable flow (150 m3.sec-1), therefore the Nosice HPP having its maximum flow rate close to 400 m3.sec-1 has a limited period of peak-load operation.
Slovenské elektrárne operates 31 hydroelectric plants. Their combined output is 1,652.7 MW, representing approximately 38.4% of the Company’s total installed capacity. Majority of the installations is located on the Váh River cascade, or the longest river in Slovakia. On average, the hydroelectric sources generate 2,070 MW annually (consumption of pumped storage power stations excluded), or some 11% of the electricity produced by Slovenské elektrárne.
Because of their very variable power output and operational flexibility, hydroelectric plants are capable to satisfy the swiftly changing demands in the daily-load diagram, pairing nicely with the base load supply covered by nuclear power plants. Slovenské elektrárne has 736.6 MW installed in river hydropower plants and 916.4 MW in pumped storage power stations.