RAWLINS, Wyo. (AP) — With the harsh Wyoming winter weather in the past, work has resumed on the biggest onshore wind development in the United States.

"We have about 40 pieces of equipment and about 30 or 40 operators," said Bill Miller, CEO of Power Company of Wyoming, a Denver-based subsidiary of The Anschutz Corp. "We started up in early April for this year's infrastructure construction."

However, it will be at least a year before any turbines are erected, Miller said.

"There's so much basic infrastructure that needs to be built," he said.

Once complete, the Chokecherry and Sierra Madre Win...