When carbon dioxide and other minor constituents are removed, the product is a purified pipeline-quality natural gas that is almost 100 percent methane. This biomethane is interchangeable with any other natural gas, but it is a zero-carbon resource. Coupling this zero-carbon profile with the ultra-low “conventional” emissions of natural gas makes renewable natural gas a nearly perfect fuel. It is storable, it boasts a high energy density that is almost emission-free, and it is easily transported over existing infrastructure to serve any natural gas application.