Nearly once a day last year, a large tanker sailed up the Delaware River and docked at Marcus Hook Terminal to take on a cargo of liquid fuel, produced mostly from the Marcellus and Utica Shale formations in Western Pennsylvania and neighboring states.
The fuels — propane, butane, and ethane — were destined for markets in Europe, the Caribbean, Asia, Africa, and South America, where they’re used for heating, motor fuel, and as raw…
