| Case Number | Case Title | Open Date | Closed Date |
| 00-0681-GA-GPS | CINCINNATI GAS & ELECTRIC COMPANY | 04/13/2000 | 04/13/2005 |
| 03-1990-GA-GPS | HORIZON UTILITIES GROUP, INC. | 09/22/2003 | |
| 04-1543-GA-GPS | VECTREN ENERGY DELIVERY OF OHIO | 10/08/2004 | |
| 06-0476-GA-GPS | COMMISSION'S INVESTIGATION OF THE OWNERS AND OPERATORS OF A GAS PIPELINE FACILITY | 03/27/2006 | 08/09/2006 |
| 06-0640-GA-GPS | INVESTIGATION OF OHIO CUMBERLAND GAS COMPANY | 05/01/2006 | 10/04/2006 |
| 08-0133-GA-GPS | IN THE MATTER OF THE INVESTIGATION OF DUKE ENERGY OHIO INC RELATIVE TO ITS COMPLIANCE WITH NATURAL GAS PIPELINE SAFETY STANDARDS AND RELATED MATTERS | 02/12/2008 | |
| 10-0105-GA-GPS | DOMINION EAST OHIO GAS COMPANY | 02/01/2010 | |
| 12-0380-GA-GPS | DOMINION EAST OHIO GAS COMPANY | 01/19/2012 | |
| 88-1433-GA-GPS | CONSTITUTION GAS TRANSPORT CO | 09/29/1988 | 12/07/1988 |
| 89-0688-GA-GPS | EAST OHIO GAS COMPANY | 05/03/1989 | 08/30/1989 |
| 89-1120-GA-GPS | COLUMBIA GAS OF OHIO, INC. | 07/20/1989 | 01/04/1990 |
| 89-1316-GA-GPS | INVESTIGATION VILLAGE OF VERONA | 08/31/1989 | 02/21/1990 |
| 90-0843-GA-GPS | VILLAGE OF TARLTON | 05/14/1990 | 06/13/1991 |
| 90-1354-GA-GPS | LAKESIDE GAS COMPANY | 08/24/1990 | 05/09/1991 |
| 91-0061-GA-GPS | COLUMBIA GAS OF OHIO, INC. | 01/09/1991 | 09/05/1991 |
| 91-0168-GA-GPS | EAST OHIO GAS COMPANY | 01/28/1991 | 07/03/1991 |
| 92-1489-GA-GPS | VILLAGE OF TARLTON | 08/19/1992 | 02/10/1994 |
| 92-2041-GA-GPS | GEO ENVIRONMENTAL, INC. | 11/10/1992 | 06/29/1994 |
| 93-0300-GA-GPS | EAST OHIO GAS COMPANY | 02/19/1993 | 09/02/1993 |
| 93-0301-GA-GPS | NATIONAL GAS & OIL CORP. | 02/19/1993 | 08/19/1993 |
| 94-0002-GA-GPS | VERONA NATURAL GAS CO. | 01/05/1994 | 03/24/1994 |
| 94-0003-GA-GPS | OXFORD NATURAL GAS CO. | 01/05/1994 | 03/24/1994 |
| 94-1637-GA-GPS | VILLAGE OF WILLIAMSPORT | 10/12/1994 | 05/11/1995 |
| 94-1761-GA-GPS | OXFORD NATURAL GAS COMPANY | 11/01/1994 | 06/06/1996 |
| 94-1847-GA-GPS | COLUMBIA GAS OF OHIO, INC. | 11/15/1994 | 08/03/1995 |
| 95-0987-GA-GPS | CONSTITUTION GAS TRANSPORT CO. | 10/25/1995 | 03/07/1996 |
| 96-0825-GA-GPS | WEST OHIO GAS COMPANY | 08/14/1996 | 12/30/1996 |
| 98-1045-GA-GPS | POWER ENERGY DISTRIBUTION, INC. | 07/15/1998 | 01/14/1999 |
| 99-0449-GA-GPS | CINCINNATI GAS & ELECTRIC COMPANY | 04/08/1999 | 09/09/1999 |
| 99-0470-GA-GPS | CONSTITUTION GAS TRANSPORT CO. | 04/13/1999 | 01/20/2000 |
| 99-1437-GA-GPS | SYMMES NATURAL GAS COMPANY | 11/04/1999 | 03/22/2001 |
| 99-1438-GA-GPS | EAST LANE MOBILE MANOR | 11/04/1999 | 05/09/2001 |
| 99-1439-GA-GPS | EAST OHIO GAS COMPANY | 11/04/1999 | 04/06/2000 |