What primary method is used to recover energy from landfill gas?

Recovering energy from landfill gas primarily involves extracting fuel to generate electricity. Landfill gas, primarily composed of methane and carbon dioxide, is produced as organic waste decomposes anaerobically. This produced gas can be captured and processed in a way that allows it to fuel generators that convert the energy content of the gas into electricity.

This process not only provides a renewable energy source but also helps in minimizing greenhouse gas emissions by reducing methane release into the atmosphere, which is a potent greenhouse gas. The electricity generated can be used on-site or fed into the grid, contributing to energy sustainability.

Other methods listed, such as burning the gas directly for heat or converting it to liquid fuels, might have their applications but are not the primary or most efficient means of energy recovery compared to electricity generation from the gas. Storing the gas for future use is also not an energy recovery method; it merely delays its utilization without providing immediate energy benefits.