From an article in The New York Times:
With every turn of the giant blades of the 136 windmills here on the edge of a mesa, the stiff desert breeze is replacing expensive natural gas or other fuel that would have been burned in a power plant somewhere else.
Wind energy makes up a small fraction of electric generation in this country, but the rising price of natural gas has made wind look like a bargain; in some cases, it is cheaper to build a wind turbine and let existing natural gas generators stand idle. Giant, modern wind farms like the New Mexico Wind Energy Center here may become more common if prices continue to rise.
The center, 150 miles east of Albuquerque, opened in the summer of 2003 and is one of the largest in the country. The power is bought by the state’s largest utility, Public Service of New Mexico, and provides about 4 percent of that company’s electricity over the course of a year. In March, when demand is low and winds are usually strong, the project generates 10 percent of the electricity the company supplies.