engineering.com article, page-2

"CETO6  has a 20 meter buoy, nearly twice the diameter of its older brother, giving it 230% more swept area. Like wind turbines, wave power output is proportional to the swept area of the energy capturing device, so one would expect 2.3 times the power. But Carnegie claims more than four times the power - one megawatt compared to 240 kilowatts. How can this be?"

I am not sure if this statement is correct.  Before Ceto 6 was even thought about, we were told that the power output increased exponentially with increased buoy diameter up to the so called "sweet spot," between 30 and 40 metres.  This seems to be saying that the new inclusions in Ceto 6 is what gives it the higher than expected output.