By May 29 2015
Natural gas produced through hydraulic fracturing (“fracking”) in shale formations has transformed the energy industry across North America over the past decade. The US Citygate gas price has fallen from a peak of 12.48 per thousand cubic feet (tcf) in July 2008 to just 4.55 per tcf in February 2015, according to price data from the Energy Information Administration (EIA). The Marcellus Shale Formation is the largest such formation in the country, accounting for 37 percent of US shale gas production in April and, according to the Bismarck Tribune, 18 percent of the country’s total gas production. A map on Geology.com shows it concentrated in Pennsylvania, West Virginia, Ohio, and New York, and it enters into Kentucky, Maryland, Tennessee and Virginia.