Hi Jordy - baffle yourself a bit more with this:
https://www.irena.org/-/media/Files/IRENA/Agency/Publication/2014/Wave-Energy_V4_web.pdf
The bottom line is that St Malo 1959 was a dog and was known to be ( never recovering its costs ever) and was a pet of Gen de Gaulle, so it was built !
wiki: As of 2022, wave power is not widely employed for commercial applications, after a long series of trial projects.
this screams 'dog, still'
I thought St Malo was the only one, but I cd be wrong.
Lots of wd be engineering to confuse you. Flow froo a turbine can never be more than 16/27 efficient ( which is kinda lowish) - and you need a high wave energy density - wham power. Big waves.
and Sandy: I wish you woldnt go:
good idea: no?
you sound like Manwell the waiter - no?