well engineered motion into electricity device

[MileHigh]

The technology has been proven by nature (bio-technology) and is also based on the same principals as the bladeless vortex wind turbine.  "No company" doesn't imply it's a "non-functioning company" as you're trying to infer.  However, I'll give you the benefit of the doubt in what you were trying to convey.

Gravock

Saying "no company" does indeed imply a non-functioning company when you are clearly discussing a company that has some kind of a presence, even if they are doing nothing.  It's just casual everyday business slang that is in common use.

[MileHigh]

Another red herring! 

No, it is you who needs to put your thinking cap on!  If a dead trout can move upstream without expending any energy by creating vortices...

Not by "creating vortices" but rather by exploiting the existing vortices that are there in the turbulent stream.  As you can see, you led yourself down a garden path and next time put your thinking cap on.

[MileHigh]

Once again, big gyrating floats aren't necessary with MeyGen and Andritz Hydro Hammerspace and can produce power 24/7 unlike solar.  You'll get less bang for your buck with solar power.

Gravock

When you examine the hypothetical case of a low-rise commercial office building next to the ocean with a large roof surface area, and you compare solar power and some sort of hypothetical system to extract power from the nearby ocean, the first thing that comes to mind for me is the cost of the installation and the associated return on investment.

I am just going to take a guess that with the rapid decrease in the cost of solar panels and the fact that there is now a huge industry with an established ecosystem, the ROI is probably between 10 and 20 years for a typical office building installation like I am describing.  In contrast, if you went with some sort of underwater sea power installation for a single building, the ROI would probably be between 100 and 200 years.

So you get more bang for your buck with solar power.

Just from glancing at the two European underwater turbine companies you linked to, I am going to assume it is only economically feasible for large-scale installations where there are regular underwater flows that can be readily harnessed.  I did not check if either company has a true working commercial installation at this time.

[lancaIV]

http://www.borderlands.de/net_pdf/NET0511S30-33.pdf
an undersea hydraulic ram pump,aproved by their own prototype experiment