Taxation – Environmental – Carbon Charge – County Levy – Tax Injunction Act 

GenOn Mid-Atlantic LLC v. Montgomery County, Md. A Maryland county’s levy on a single “taxpayer,” an electric company, for its carbon dioxide emissions was not a “tax” that meant the district court could not hear the electric company’s challenge to the levy under the Tax Injunction Act; the 4th Circuit says that because the carbon charge was levied on a single “taxpayer” and formed part of a wide-ranging regulatory program, the district court had jurisdiction over the company’s claims.