| Case Number | Case Title | Open Date | Closed Date |
| 13-0275-EL-UNC | Notice of filing of Greenhouse Gas Emissions Report | 01/23/2013 | |
| 13-0621-EL-UNC | Duke Energy Ohio Notice of Filing | 03/08/2013 | |
| 17-0368-EL-UNC | THE OHIO EDISON COMPANY THE CLEVELAND ELECTRIC ILLUMINATING COMPANY THE TOLEDO EDISON COMPANY | 02/07/2017 | |
| 18-0236-EL-UNC | Audit of the Energy Efficiency and Peak Demand Reductions Achieved by the Electric Distribution Utilities Pursuant to R.C. 4928.66 | 02/06/2018 | |
| 18-1381-EL-UNC | Stream Ohio Gas & Electric - Notice of Material Change | 09/06/2018 | |
| 18-1570-EL-UNC | The Dayton Power and Light Company | 10/18/2018 | |
| 21-0408-EL-UNC | Duke Energy Ohio Inc. SEET (Significantly Excessive Earnings Test) | 04/14/2021 | |
| 23-0458-EL-UNC | Duke Energy Ohio, Inc. Nonpayment Service Disconnections Annual Report | 04/20/2023 | |