North America's natural gas supply base is vast. NGVs run on abundant domestic supplies.

The U.S. is the largest producer of natural gas in the world. The extensive supply resource ensures security of supply and contributes to a generally stable commodity price.

Furthermore, in March 2021 the U.S. EIA reported that "The Appalachia region remains the largest natural-gas producing region in the United States."

This positive supply news was noted in September 2019 when the Potential Gas Committee released its 2018 biennial report: Potential Supply of Natural Gas in the United States. The updated assessment finds that the United States possesses a total technically recoverable natural gas resource base of 3,374 trillion cubic feet (Tcf). This is the highest resource evaluation in the PGC's 54 year history - exceeding by 557 Tcf the previous record-high assessment from year-end 2016. The Atlantic area ranks as the country's richest resource area with 41% of total U.S. traditional resources...The largest volumetric gains (264 Tcf or 25%) were reported in the Atlantic area. The major reason for the increase is new drilling and production results from Marcellus and Utica shale plays in the Appalachian basin.