Compressor Station: A facility that provides energy to move natural gas within a pipeline by increasing the pressure of the gas at the discharge side of the facility compared to the intake side.  Compressor stations vary in size to facilities as small as a double-car garage to larger facilities featuring several buildings some as large as a typical three-bedroom home.  The engines that provide the energy to move the natural gas in the pipeline are either piston-driven reciprocating engines or turbine engines.  Most compressor station facilities have sound abatement features and all are fenced and secured.

Federal Energy Regulatory Commission (FERC):  Federal agency within the Department of Energy regulating prices and conditions of service for interstate electricity and natural gas transmission and sale.

Natural Gas Storage:  Facility used for the storage of natural gas; usually a cavern carved out of natural salt domes or depleted natural gas reservoirs into which natural gas can be reinjected and produced with minimal loss.

Natural Gas Storage Service:  A service in which natural gas is received by the seller of the service and held for the account of the customer for redelivery at a later time. Storage services are typically utilized by customers to allow more even purchases or sales of natural gas throughout the year, despite variations in end-use demand. Storage service is also a critical element of the peak period deliverability of many interstate natural gas pipelines and distributors. Injection, withdrawal and holding fees are usually charged, and limits on rates, times of injection and withdrawal, and maximum volumes to be held are usually imposed.