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.
Bloomberg News reports that Valero Enery Corp. plans to increase production by 10,000 barrels a day within the the next year at refineries in Texas and Louisiana.
Both new hydrocrackers had been planned to operate at 50,000 barrels a day, but both will run at 60,000 barrels a day, the company said.
Both units can operate at up to 75,000 barrels per day, but they won't be running at that level, the company said.
The units are at the Port Arthur refinery in Texas and at the St. Charles refinery in Louisiana.
Hydrocrackers convert heavy hydrocarbons to lighter products including distillate fuels like diesel.