Gases are created when organic waste breaks down or decomposes within a MSW landfill. Modern landfills have landfill gas collection systems to collect this landfill gas, which contains approximately 50% methane and is either destroyed by combusting it in a flare or is diverted to an on-site facility for the conversion of this gas to energy thus preventing it from escaping into the atmosphere as a greenhouse gas.
The treated landfill gas can be pumped off site to a manufacturer or commercial business near the landfill to supplement or replace their natural gas usage in the form of Renewable Natural Gas (RNG). It can also be used to generate electricity at the landfill that is then delivered to the electrical grid to power homes and businesses.
This is why the conversion of landfill gas to energy is an effective means of recycling and reusing this valuable resource.