It was never the case that the CETO BA’s would sit on the bottom during a storm. Other companies’ active element such as Aquamarine and Bio-Systems Energy and some others do that, and shut down for the time being. Posters here conflated these ideas and guessed wrongly that it also happens for CETO so that it becomes a local mythology. CETO keeps producing energy during a storm – a big plus.
The energy relief system together with keeping the BA two metres under sea surface is supposed to be sufficient protection. Nothing is ever completely protected. A single rogue meteor could wipe out your city in two seconds; even less for a wave farm.
I think of a C6 as a 2000 tonne ripe tomato floating in the water. The skin and a light weight internal structure keeps it erect. It has near neutral buoyancy so that the only significant variable force on it is the tether underneath anchored to the sea bed. The critical issue is what happens when a large amplitude heaving sea attempts to lift the buoy passed the energy relief amplitude limit.
Juke
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