CETO Energy Relief System: "A unique and novel feature of CETO...

CETO Energy Relief System:

"A unique and novel feature of CETO is the incorporation of an energy relief system in the Buoyant Actuator. This allows the CETO Units to self-regulate the amount of energy absorbed from a wave, thereby limiting the total forces transferred to the CETO Units. This in turn allows the CETO Units to continue to operate unhindered through storm events without human intervention. The energy relief systems will be supplied by Tensa Equipment Pty Ltd a company that specialises in the design and supply of dynamic load reducers."

https://www.cleanenergyfinancecorp.com.au/media/76247/cefc-factsheet-carnegie_wave_lr.pdf

Tidal range compensation was often mentioned when referring to Ceto 5. I have never really understood how that is achieved. Perhaps as you say, they can control the length of the tether, or perhaps the amount of water inside the buoy can be controlled.