To understand the impact of Appalachian natural gas, just look at the Spectra Energy Partners LP (NYSE: SEP) map.

The sprawling pipeline system—centered around the Texas Eastern and Algonquin systems—carries gas through the eastern U.S., north to Canada and south to Texas to move LNG into Mexico. In 2016, volumes riding the pipelines averaged about 5.5 billion cubic feet per day (Bcf/d), sometimes as high as 6 Bcf/d in the southwest Pennsylvania, Ohio and West Virginia area.

“Definitely room for growth,” Bobby Huffman, Spectra’s director of business development, told attendees at Hart Energy’s recent Marcellus-Utica Midstream Conference & Exhibition. “That means more work to do for us in business development to get this to market.”