Assessment of the Impact of Flow Changes and Water Management Rules in the Dam Reservoir on Energy Generation at the Jeziorsko Hydropower Plant

This paper presents the impact of flow changes in Warta River and water management rules regarding Jeziorsko dam reservoir on energy production by hydropower plant period 1995–2021. The was built 1986. It is second largest Poland terms surface area. In 1994, a with an installed capacity 4.89 MW started operation. study results show average annual from 1995 to 2021 at level 18,718 MWh. On other hand, largely changed year year, 12,432 MWh (in 2019) 26,916 2001). droughts that have occurred basin over past two decades had major production. As consequence drought, it not possible maintain required reservoir. Moreover, change for reservoir’s led lower levels 1.5 m between April June important point view Improving efficiency requires changing More flexible operation schemes should be considered, including operational based meteorological hydrological forecasts. criteria also such as maintaining environmental flows, ensuring protection flooding, operating nature reserve around