Chesapeake Energy Corp,the Oklahoma-based firm is the No. 1 driller in Ohio.
Rig Count Interactive Map by Baker Hughes, an energy services company.
Shale Sheet Fracking, a Youngstown Vindicator blog.
The Ohio Environmental Council, a statewide eco-group based in Columbus.
Earthjustice, a national eco-group.
People's Oil and Gas Collaborative-Ohio, a grass-roots group in Northeast Ohio.
Concerned Citizens of Medina County, a grass-roots group.
No Frack Ohio, a Columbus-based grass-roots group.
Fracking: Gas Drilling's Environmental Threat by ProPublica, an online journalism site.
Pipeline, blog from Pittsburgh Post-Gazette on Marcellus shale drilling.
Allegheny Front, environmental public radio for Western Pennsylvania.
From the Pittsburgh Post-Gazette:
The Marcellus shale region now accounts for 26 percent of the country's shale gas production, according to the latest report from the U.S. Energy Information Administration.
The Marcellus formation of Pennsylvania and other Mid-Atlantic states produced 6.8 billion cubic feet of gas per day in October, an increase of 72 percent from the same time one year ago.
That increase in production comes despite a decrease in the number of active rigs, some of which have moved westward to drill in Ohio's more lucrative Utica Shale region.
The Marcellus had 88 active rigs in October after declining by 53 rigs over the past year, according to Baker Hughes data cited by the government agency.
Over the past year, the number of rigs drilling in the Utica Shale has doubled to 28, with a vast majority of those rigs drilling for oil.
Chesapeake Energy of Oklahoma City remains the dominant player in Ohio, according to Bentek Energy data cited by the EIA.
On a recent conference call with investors, Chesapeake CEO Aubrey McClendon called the company's 300,000 to 400,000 leased acres in Carroll, Harrison and Columbiana counties in Ohio the "core of the core" in Utica development. Those three counties are just over the Pennsylvania border, about 70 miles west of Pittsburgh.
For all of the industry excitement, the Utica development remains in its infancy. The formation's 28 active rigs represent about 2 percent of all rigs in the country, according to Baker Hughes.