A manufactured product chemically similar in most respects to natural gas, resulting from the conversion or reforming of petroleum hydrocarbons. It may easily be substituted for, or interchanged with, pipeline quality natural gas. Also referred to as substitute natural gas.

Gases made from coals and other hydrocarbon-containing substances.

A gaseous fuel similar in composition and energy content to natural gas. SNG contains at least 85 percent methane by volume, plus small amounts of other combustible gases such as hydrogen.

A manufactured product chemically similar in most respects to natural gas, that results from the conversion or reforming of petroleum hydrocarbons and may easily be substituted for or interchanged with pipeline quality natural gas. Underground Gas Storage Reservoir Capacity: Interstate company reservoir capacities are those certificated by FERC. Independent producer and intrastate company reservoir capacities are reported as developed capacity.

Gaseous fuel containing mostly methane produced from solid coal.