Regency plays a critical role in the midstream value chain by providing gathering and processing, contract compression, contract treating and transportation of natural gas, and transportation, storage and fractionation of natural gas liquids (NGLs) for producers.

The gathering system consists of a network of low-pressure, low-diameter pipelines that transport raw natural gas from the wellhead to a processing plant located near the production, where it is treated, dehydrated, and/or processed. In the dehydration process, water is removed from the gas.

Natural gas compression is a mechanical process in which gas at a lower pressure is boosted, or compressed, to a desired higher pressure, allowing it to flow into higher pressure downstream pipelines. Field compression is typically used to lower the gas pressure at entry into the gathering system, while maintaining or increasing the exit pressure, providing sufficient pressure to deliver gas into higer pressure downstream pipelines.

Treating entails the removal of impurities, such as water, sulfur compounds, carbon dioxide and nitrogen from natural gas. The treating process involves a continuous circulation of a liquid chemical called amine that physically contacts with the natural gas and absorbs impurities. After mixing, gas and amine are separated, and the impurities are removed from the amine by heating.

Transmission lines are comprised of intrastate and interstate pipeline systems and pipeline facilities. Natural gas is transported to end users, including electric power generation facilities and large industrial plants, while natural gas liquids are transported to NGL fractionation facilities.

NGL fractionation facilities separate natural gas liquids into marketable NGL products that can then be stored for later use or sold at market to petrochemical and refining companies.