Siemens and Vestas Wind Systems are offering different types of wind turbines for the offshore-wind market, which the U.K. Carbon Trust said may be worth $54.38 billion by 2020. Siemens' "direct-drive" gearless turbines are designed for minimal maintenance, but their unproven technology could hamper sales, analysts said. Vestas' traditional turbine design might be more acceptable to risk-averse investors, analysts added.

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