Halliburton has deployed nearly 100 light-duty compressed natural gas (CNG) trucks across several field locations in the U.S., the company announced.

According to a company release, the bi-fuel trucks were recently purchased as part of a pilot program to be rolled out throughout the company’s U.S. operations.

“There is considerable focus across the industry to identify multiple ways to leverage this abundant, reliable and cleaner burning source of energy in day-to-day operations,” said Halliburton Western Hemisphere President Jim Brown in a release.

When operating on CNG, the environment-friendly vehicles emit about 90% fewer emissions than gasoline-powered vehicles and are estimated to save approximately $5,100 per truck in fuel cost annually, the company said.

The new CNG truck fleet will be assigned to 15 U.S. locations across seven states including: Texas, Oklahoma, Colorado, California, Louisiana, Utah and Pennsylvania.