SARITA — On the 400,000-acre Kenedy Ranch along the southern Gulf Coast, the wind coming off the water nearly flattops the clusters of oak trees. Towering above the trees, above the long grasses, sand dunes, grazing cattle and the occasional antelope, are scores of wind turbines, each about as tall as a football field is long.

“It’s always nice to be cranking,” said Daniel Pitts, who manages the wind plant for its owner, Iberdrola Renewables, as the machines spun in the breeze.

The wind farm, which began operating in 2009 and doubled in size last year, reflects the new ...

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