| Case Number | Case Title | Open Date | Closed Date |
| 01-0032-GA-GPS | ROY A. MILLER dba 83 SALES,LTD, | 01/03/2001 | 07/23/2010 |
| 06-1205-GA-GPS | INVESTIGATION OF COLUMBIA GAS OF OHIO INC | 10/04/2006 | 07/27/2009 |
| 10-0459-GA-GPS | COLUMBIA GAS OF OHIO INC | 04/12/2010 | 03/01/2021 |
| 11-3636-GA-GPS | DUKE ENERGY | 06/17/2011 | 11/23/2015 |
| 14-1639-GA-GPS | Northeast Ohio Natural Gas Company | 09/23/2014 | 11/23/2015 |
| 15-1351-GA-GPS | In the matter of the investigation of Columbia Gas of Ohio relative to compliance with the Natural Gas Pipeline safety standards and related matters | 07/24/2015 | 03/01/2021 |
| 18-1459-GA-GPS | IN THE MATTER OF THE INVESTIGATION OF RUSTIC HILLS OUTDOOR INC RELATIVE TO ITS COMPLIANCE WITH THE NATURAL GAS PIPELINE SAFETY STANDARDS AND RELATED M | 09/24/2018 | 04/05/2019 |