Guardian: After a decade in development, the toughest wind turbines ever built are ready to make their debut. The machines are the world’s first designed specifically for the harsh and remote conditions of the sea and have been developed in Germany, by the French energy company Areva. The turbines have a new waterproofing system and a simplified and lighter design, which should mean they require fewer expensive maintenance visits and are cheaper and easier to install and maintain. The turbines …