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.

Wind Power Is Becoming a Better Bargain