FRACKING: As an Ohio company sends diluted fracking wastewater to a municipal treatment plant, where it eventually winds up in the Mahoning River, state officials debate whether the practice is legal, and which agency should regulate it. (EnergyWire)

ALSO: A Pennsylvania study finds brine from the Marcellus Shale can make its way into drinking water supplies, but found no contamination from drilling operations. (New York Times)

OIL: A meeting today will discuss the cause of the 2010 Kalamazoo River oil spill in Michigan; and North Dakota wildlife officials have little recourse to protect the state’s most pristine natural areas from drilling. (Battle Creek Enquirer, EnergyWire)

EPA: A federal appeals court could rule as early as today on the EPA’s Cross-State pollution rule, and agency officials will meet today with state regulators to discuss pollution rules that have come under political fire. (Reuters, The Hill)

COAL: The Illinois EPA may reconsider an air permit for Tenaska’s proposed coal-to-gas plant in Taylorville, and St. Louis-based Patriot Coal files for bankruptcy. (Chicago Tribune, Associated Press)

WISCONSIN: After a yearlong hiatus, the state’s Focus on Energy program resumes, offering $2 million in incentives for renewable energy projects. (Milwaukee Journal Sentinel)

EFFICIENCY: DTE Energy activated its air conditioner cycling program on Friday amid record high temperatures. (Detroit Free Press)

SOLAR: The city utility in Traverse City, Michigan, asks residents whether they’d pay a surcharge to support a new solar project, and Michigan’s largest solar array goes live atop an IKEA store in Canton. (Traverse City Record-Eagle, news release)

COMMENTARY: Brad Plumer looks at how air conditioning has impacted our society — and our climate. (Washington Post)