Las Vegas installed some eco-friendly streetlights powered by the sun and the kinetic energy of its foot traffic.

The lights are from EnGoPLANET, a New York City-based tech startup that produces clean versions of urban infrastructure.

Vegas’s streetlights charge in the sunlight during the day, and kinetic pads also collect energy produced by footsteps. Each time a pedestrian steps on a tile, energy is created and gathered in a battery.

EnGoPLANET estimates the world spends $40 billion annually in energy for streetlights. Those streetlights, in turn, produce more than 100 million tons of CO² per year. The company also seeks to provide sustainable lights to African countries where 1.4 billion people traverse darkened streets.

“Clean and free energy is all around us,” said Petar Mirovic, EnGoPLANET’s chief executive officer. “Urban cities have to build the smart infrastructure of tomorrow that will be able to harvest all that energy. This project is small, but a very important step in that direction.”

For its part, Las Vegas mayor Carolyn G. Goodman said the lights are just one way in which the city is exploring sustainable alternatives.

“We want to provide the highest service levels while also looking to the future and ensuring that we are sustainable,” she said. “Through our LEED [Leadership in Energy and Environmental Design]-certified buildings, solar projects, water reclamation, alternative-fueled vehicles, and sustainable streetlights, Las Vegas continues to lead the way. Las Vegas strives to be on the cutting edge of all things, and this project coincides with plans to develop an innovation district in our downtown.”