| Case Number | Case Title | Open Date | Closed Date |
| 00-1860-GA-COI | WEST MILLGROVE GAS COMPANY | 10/10/2000 | 08/17/2023 |
| 05-0463-GA-COI | INSTALLATION, USE, AND PERFORMANCE OF NATURAL GAS SERVICE RISERS | 04/06/2005 | 08/17/2023 |
| 08-1229-GA-COI | FIVE YEAR REVIEW OF NATURAL GAS COMPANY UNCOLLECTIBLE RIDERS | 11/14/2008 | 08/29/2023 |
| 13-1307-GA-COI | IN THE MATTER OF THE COMMISSION'S REVIEW OF THE NATURAL GAS RETAIL MARKET DEVELOPMENT | 05/31/2013 | 02/13/2014 |
| 83-0135-GA-COI | COLUMBIA GAS OF OHIO INCORPORATED | 01/20/1983 | 08/17/2023 |
| 90-1825-GA-COI | SUBURBAN FUEL GAS, INC. | 11/29/1990 | 09/05/1991 |
| 99-0661-GA-COI | COMMISSION INVESTIGATION | 06/01/1999 | 08/17/2023 |