The cloudy weather did nothing to dampen the enthusiasm at the Build San Antonio Green Solar Fest in Roosevelt Park Saturday.
Thousands turned out for free giveaways and information about how to save both the environment and money.
CPS Energy had one of the most popular booths.
Volunteers were giving away free trees and promoting the Green Shade Tree Rebate program.
The U.S. Department of Energy estimates that carefully positioned trees can save up to 25 percent of the energy a typical household uses.
So CPS Energy is encouraging customers to plant drought tolerant shade trees.
To be eligible, CPS Energy customers must purchase trees in five-gallon or larger containers from a list of qualifying species.
After the purchase is made, customers simply fill out a form and then provide a copy of the receipt and a current bill.
The program lasts as long as funds are available and it is first come, first served.
Beth Lettman of CPS Energy said “It’s very easy. You can go to any retailer. There are 19 species available and it's very easy to plant. We have planting guide instructions on our website as well. And the nurseries also assist with that."
Learn more about the program here.