At least 22 of the buses in the fleet are powered by compressed natural gas (CNG) in an effort to reduce emissions, including six that were purchased with funds from the Volkswagen emissions scandal settlement. The transition from diesel to CNG began around 2015 due to the environmental and cost benefits, prompting a long-term plan to move the entire bus fleet to CNG. The move follows COTA, which began operating its first 30 CNG buses in 2013. CABS' fleet also includes several hybrid-electric vehicles.