This invention relates to an arrangement in a wave energy recovery apparatus and to a method for operating the wave energy recovery apparatus. The apparatus comprises at least a base (1), on which a reciprocating panel (2) is installed, a pivot shaft (7) for the reciprocating panel (2), a control system, and one or more power-take-off (PTO) units (3) to convert kinetic energy of waves or tidal currents to another type of energy. The arrangement comprises adjustment means (5, 5′, 5″) to set the top of the panel (2) in its vertical position to approximately correspond to the altitude of the surface (8) of the water.
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