Pennsylvania has seen a major rise in natural gas production, driven by the development of the Marcellus Shale, one of the largest shale gas formations in the U.S.

Pennsylvania has become a leading state in natural gas production due to the rich deposits found in the Marcellus Shale, which spans across much of the state. Since the early 2000s, advancements in hydraulic fracturing (fracking) and horizontal drilling have unlocked vast amounts of natural gas, transforming Pennsylvania into a top producer. This boom has brought economic benefits, including job creation and energy production, but also environmental concerns. The state's natural gas output has contributed significantly to the U.S.'s energy supply, positioning Pennsylvania as a key player in the nation's shift towards cleaner energy sources in recent years.