Underground gas storage is a method used to store natural gas in underground formations, such as depleted oil and gas fields, aquifers, or salt caverns. This process helps manage supply and demand fluctuations, ensuring that gas is available during peak usage times, like winter months. The stored gas can be injected into the pipeline system when needed, providing a reliable energy source. Facilities for underground gas storage are designed to maintain safety and environmental standards, minimizing risks associated with gas leaks or contamination of groundwater resources.