Hydro storage reduces electricity costs and keep wind and solar unpolluted

New energy policy is caused by narrow range of operation of Thermal Power Plants, potential risks of Nuclear Power Plants, limited resources of oil, gas and coal, and new trends in ecology. Taking into account that renewable energy, solar and wind power particularly are very dependent on the climate, Hydro Power takes a new role in energy systems. Electricity conversion and storage in periods of lower consumption or available excess production, and electricity production from the stored energy in periods of higher demand or reduced production, are crucial for the maintenance of stable and efficient electrical system. This requirement has especially strengthened nowadays in the world due to the expansion of integration of new wind and solar plants. These renewable sources are characterized with inherent intermittent production both in daily periods and periods of several days, weeks or even months.