Trimming the Costs of Wind Power

As governments, businesses and environmentalists from around the world gather for the United Nations climate change summit meeting that begins today in Copenhagen, one of the featured attractions will be the array of windmills just off Denmark's coast.

Some of the enormous machines, which provide about 4.5 percent of Denmark's power, can be seen from Copenhagen's shores. And an offshore blade made by the Danish manufacturer L.M. Glasfiber, the world's longest at 61.5 meters, or 202 feet, is on display outside the conference hall.