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This weekend, Austin Community College student Adrian Lopez showed kids how the sun can be used to provide energy. He’s also learning a few things himself.

"Hopefully a new perspective of where things are going, where things need to go, and how I can contribute," he said.

The fair is a place to get hands-on experience with the latest green and sustainable technology.

"It's a great 'do it yourself' material,” Paul Wood with ShelterWorks said of his product on display. “There's no other wall system to build a home or a commercial building for the do-it-yourselfers as easy as this. It's like big LEGO blocks."

Those blocks are an example of alternative construction materials that are good for the earth and cut energy consumption.

"It provides a great insulation value to the home, it captures thermal mass and homes are able to save money on heating and cooling expenses," Wood said.

For Lopez, this weekend's fair is a chance to be inspired.

"I'm studying environmental science and eventually I want to be an inventor in energy production," he said.

The renewable Renewable Energy Roundup and Green Living Fair is this Saturday and Sunday, rain or shine, in Fredericksburg. Learn more at TheRoundup.org.