Power development company Invenergy LLC and General Electric Co on Wednesday announced plans to build the largest wind farm in the United States in Oklahoma, part of a $4.5 billion project to provide electricity to 1.1 million utility customers in the region. The 2-gigawatt Wind Catcher wind farm is under construction in the Oklahoma panhandle and will come online in 2020. The facility will be linked to a 350-mile dedicated power line that will send the wind farm's electricity to Tulsa.