The world needs a new source of energy, an unspillable source.

i need info on maintenance of offshore wind turbines used for generating electricity?

specially on how they are serviced, do they use ships or helicopters to reach them and service them, and where can i find info on such vessels. also what is the most common problem with existing ones. i accept information as well as websites this is for my final project to graduate from college so any help will be greatly appreciated, you can send any info to cheda50@yahoo.com