A buoyant floating structure 1, 2, 3 sited on the sea off the coast comprises a floating platform 2, 3 with buoyancy chambers 1 constrained within a set of columns 6 which are secured to the sea bed. The platform 2, 3 rises and falls with the tide. The linear motion is converted by the pillars 6 and the platform 2, 3 to rotary motion to drive generators 7 within the structure. The platform may also comprise other forms of renewable energy generation: wind power 14, harvesting wave power 10, 11, 12 and photovoltaic or solar power 13. A stabilizing weight 4, 5 may be provided. The facility may also provide accommodation for staff or residents, maintenance and workshop facilities and docking facilities for boats, submarines and helicopters. Fish farming may be provided.
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