Technical details regarding the design, the construction and the operation of seawater pumped storage systems

This paper presents important technical details for the design, construction and operation of seawater pumped storage systems (S-PSS).S-PSS co-operating with wind parks, features as the most promising technology towards maximizing Renewable Energy penetration in insular systems with low annual rainfalls.This article summarises the fundamental points of integrated studies of S-PSS, from the feasibility study to the precise positioning of the systems' components and the selection of the main equipment. Special issues regarding the use of seawater from the PSS (pumped storage system), such as the use of materials for the construction of the penstock, the construction of the upper reservoir, placing the pump station and the hydro power plant on the coast and the selection of pump and hydro-turbine models are presented thoroughly. Indicative results are presented from two S-PSS of small and medium size.The study proves that current technology enables the secure use of seawater in PSS. The electricity surplus from Wind Powered Pumped Storage Systems (WP-PSS) can also be exploited in reverse osmosis desalination plants for producing potable water.Seawater can be pumped directly from the sea, thus construction of a lower reservoir is avoided, compensating higher costs arising from the use of corrosion-resistant materials for certain components.

► The proper terrain parameters for a seawater pumped storage sitting are listed. ► The reservoir sealing techniques are investigated. ► Special materials and techniques for the penstock installation are presented. ► The appropriate hydrodynamic machines features are presented. ► The sitting and construction of the pump and hydro stations is described.