As I traveled across Texas this week I was amazed at the dramatic increase in the number of wind generators. The stretch from north of Snyder, Texas, to Abilene, Texas, is becoming one continuous wind power generating field. The grid still is not able to fully utilize all of that power -- and there is more being built -- especially futher north into the Texas Panhandle and on up through the High Plains of Kansas and Nebraska. The article linked below discusses some of the grid issues.
Wind development seen biggest challenge for power grid