GREELEY, Colo. (AP) The world's largest wind-turbine manufacturer says it plans to increase its presence in Colorado by building the world's largest factory for wind turbine towers.

Vestas Wind Systems made the announcement early Thursday in its first quarter financial report, posted on the company's Web site. But the report doesn't indicate if the new factory will be located at Vestas' current site in Windsor, or elsewhere in Colorado.

Vestas opened its first U.S. blade manufacturing facility in Windsor in March, and expects to employ 650 to 700 people when the factory is in full production.

The new factory is expected to employ 400 people by the end of 2010.

The tower production facility is expected to cost an estimated $250 million to build.