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.
A Canadian company has been asked to frack two wells in Ohio using liquid petroleum gas, not water.
The request was made to GasFrac Energy Services, a company based in Calgary.
The waterless fracking could begin in the next few weeks, officials said.
The request was made by a unnamed drilling company, says Crain's Cleveland Business and Midwest Energy News.
The Canadian company would use a mixture of propane and perhaps some butane that is pressurized to the consistency of a gel.
It is then injected like water through pipes at high pressure to release oil and gas by cracking the rocks deep underground.
The LPG, unlike water, mixes with petroleum and returns to the surface. It reportedly does not dissolve any salts, heavy metals or radioactive materials. Water picks up those materials and that complicates on-surface disposal.
Most Utica shale wells in eastern Ohio take about 6 million gallons of water.
The gas process was used in 2011 by Chevron in Colorado. It reported that the technique "significantly increases production while minimizing water usage."
GasFrac has recently sigfned a contract with BlackBrush to use the technique in the Eagle Ford shale in southeast Texas.
Click here to read the Crain's story.