RE: RNS wind up2 Feb 2017 10:57
Offshore wind is cheaper than you think and headed much cheaper. It has been cutting costs by 10-12% for 4-5 years now. The last round of offshore wind in the UK was about £110/MWh, the most recent tenders in Europe have dropped to sub £70/MWh. While the next generation of offshore wind is going to be enormous - have you seen the size of the new developments?
Have a look at http://www.4coffshore.com/offshorewind/ those square boxes out at sea in the UK (a landmass similar in size to Wales) is up for about 20GW of total capacity.
The UK will be a leader in offshore wind for 2 reasons, a) NIMBYs preventing work onshore (christ they're upset enough about turbines 30 miles off the coast), and b) the majority of the water between UK and Europe is shallow-ish (below 35m deep). Off the coast of France for example, the ocean becomes very steep, very quickly, and thus is why the French are focussing on floating technology.
Floating is a relative newcomer that has some attached risks (some early design were essentially crap and just sank). I do not know where it is going - but the idea of towing along a mobile turbine to anywhere you like is attractive (if only because planning regs are much less strict if you can remove the structure whenever you like).