The nation’s largest wind farm, providing 736 megawatts, is in Taylor County, Texas...
http://www.nrel.gov/docs/fy07osti/41435.pdf
Here is the report
Texas 2739 Megawatts
Calif 2379 “
and now, for the Angus part of the report
Massachusetts 4 Megawatts
The second-largest is a 505-megawatt project in Sweetwater, Texas, according to the American Wind Energy Association.