| Case Number | Case Title | Open Date | Closed Date |
| 89-0171-GE-PIP | COLUMBIA GAS OF OHIO, INC. | 01/25/1989 | 08/30/1989 |
| 89-0189-GE-ORD | CONSUMPTION PATTERNS-ELEC/GAS COS. | 01/31/1989 | 08/24/1995 |
| 89-0809-GE-ATA | CINCINNATI GAS & ELECTRIC COMPANY | 05/17/1989 | 08/01/1989 |
| 89-0814-GE-AIS | CINCINNATI GAS & ELECTRIC COMPANY | 05/17/1989 | 05/31/1989 |