Renewable natural gas (RNG), also known as biomethane, is a biogas that has been upgraded to a quality similar to fossil natural gas and has a methane concentration of 90% or greater. It is considered a carbon-neutral fuel because it comes from organic sources that once absorbed carbon dioxide from the atmosphere during photosynthesis. RNG is essentially biogas that has been processed to purity standards, and it is fully interchangeable with conventional natural gas, making it an attractive means of supplying existing premises with renewable heat and renewable gas energy. RNG can be produced from multiple sources, including livestock waste, landfills, wastewater sludge, food waste, and other organic waste operations. It can be used for electricity generation, thermal functions like heating and cooking, bioplastics, and vehicle fuel. RNG can be converted into liquefied natural gas (LNG) or compressed natural gas (CNG) for direct use as fuel in the transport sector. RNG is an attractive renewable energy tool because it is available 24 hours per day, seven days a week, and can be deployed when and where it is needed through the pipeline network.