The days of extreme heat can take a real toll on the energy supply available for San Antonio.

News 4 WOAI's Leila Walsh has learned CPS Energy is turning to the West Texas desert to help meet the demand for electricity here in San Antonio.

It's been every day for the last week.

"It's hot," says CPS Energy customer. "From early in the morning to late at night."

The temperature has been at-or-above 99 degrees.

We're all looking for a way to cool off. For many of us, it means turning on fans and air conditioners and CPS is reporting record demand.

"We're meeting about close to 7 to 10% of that with wind energy. All depending on whether the wind is blowing in West Texas," said Theresa Brown Cortez, a spokesperson for CPS Energy.

This is the Desert Sky wind farm. You might have seen it off I-10, on the way to El Paso.

"Even though, its neat to be out here and its pretty to look at it, we've got a lot of work going on and its just like any other power plant," said wind farm manager Roy Blackshear.

All the windmills, or turbines, at this farm generate power for people in San Antonio.

Looking at a model makes it a little easier to see how a turbine works. The part on the back is basically like the center of operations. There's a computer system in there that points the blades towards the wind. The wind then powers a generator in the back and that generator sends electricity all the way down the tower and perhaps onto your home.

The farm generates electricity for 45,000 homes.

CPS Energy hopes to double the number of houses powered by wind.

Two wind farms supply energy to San Antonio. Desert Sky, near the town of Iraan in west Texas and Cottonwood Creek windfarm in Sweetwater, near Abilene. The company is now planning an expansion at Cottonwood Creek.