ECA began its operations on the east coast in the Appalachian Basin, the oldest producing basin in the country, and has been active there for over 45 years. ECA owns over 1 million acres from New York to Tennessee, and operates over 5,000 wells and over 5,000 miles of pipeline.

ECA has more than 10,000 drilling locations, with over 15 TCF of resource potential and more than 400 BCF of proved reserves. ECA also has the capability to transport over 55 mmcf/d through multiple pipeline systems. In the past five years, ECA has drilled as many as 100 wells in a year, with up to 6 active drilling rigs operating at one time.

One of the earliest operators in the lucrative Marcellus shale region, ECA began testing wells in this play in the late 1970s in partnership with the Department of Energy. In 2006 ECA began its modern development of the region and has since drilled more than 150 wells from New York to Kentucky. Currently, ECA is actively developing its Marcellus acreage in Pennsylvania and West Virginia, where a vast majority of its recent wells have been drilled using innovative horizontal drilling technology.