Concept in Hydrokinetics

Extracting the kinetic energy out of flowing water, aka hydrokinetics, can take many forms.  Take a look at the video linked here and tell me what you think.

Does inserting the device partially into the water seem like a good idea?  Is a screw a better idea than a traditional turbine?  Will this enable the planet to change the way its highways are illuminated?

Of course not.  Whatev.  If its purpose is to educate kids, that’s fine.