A breakthrough technology allowing turbines to float on the sea, in tandem, rather that the prototype deep anchoring will bring construction/maintenance costs down considerably. Looks to be totally viable as per a recent article.
The possibilities and potential to renewables are as fascinating as they are exciting. I just read a project out of UK that involved harnessing the wind generated by passing traffic, off all things. Cars passing at 50mph created enough stir (a brief 12 mph flurry) to turn little propellers along a sign that could feasibly power highway lights.
Harnessing the Power of Passing Traffic: Roadside Wind Turbines Explained