A Worker attends to a Machine at the Marcellus Shale Formation

A Worker attends to a Machine at the Marcellus Shale Formation

Julia Schmalz/Bloomberg

Output of shale gas at the Marcellus deposit will reach 14.23 billion cubic feet a day next month, up from 1.18 billion in January 2007, according to the U.S. Energy Information Administration, the Energy Department’s statistical arm.