An investigation suggests an explosion and fire inside a Nebraska wind turbine-- that's part of the largest wind farm in the state-- was caused by a "foreign object".

A spokesperson for the company building the 80 megawatt Elkhorn Ridge farm, near Bloomfield, says the "object" blew into the turbine causing the blast. The incident injured three workers, including one who suffered first and second-degree burns from the waist up.

An investigation continues. But, company officials say the wind farm will begin generating power in the first quarter of 2009.