| Case Number | Case Title | Open Date | Closed Date |
| 14-0205-GA-COI | Commission Investigative Audit of Brainard Gas Corp/Northeast Ohio Gas Corporation/Orwell Natural Gas Company
| 04/02/2014 | |
| 14-1709-GA-COI | IN THE MATTER OF THE COMMISSION'S INVESTIGATION INT COBRA PIPELINE CO, LTD AND RELATED MATTERS | 09/26/2014 | |
| 16-1578-GA-COI | IN THE MATTER OF THE COMMISSION'S INVESTIGATION INTO OHIO RURAL NATURAL GAS CO-OP, AND RELATED MATTERS | 07/15/2016 | |