Wave power (in the sea) is constant The tides are constantly on the march in or out with two periods of slack water Both are free and can produce electric power

Desalination plants are normally located on the coast to access sea water Wave power varies because waves vary and tidal power drops off at high and low tide so these are not good sources of "base power" However both are well suited to producing power for desalination because the water is not necessarily being used immediately but can be stored underground or in dams Interruption to supply using tidal power is not an issue because the slack water outages can be planned for

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