Breakdown of sources by number of zero-emitting hours per day:
| hours | sources | in Ohio |
| 0 | 60855 | 2282 |
| 1 | 1333 | 0 |
| 2 | 75 | 1 |
| 3 | 68 | 0 |
| 4 | 251 | 3 |
| 5 | 49 | 0 |
| 6 | 172 | 0 |
| 7 | 101 | 1 |
| 8 | 647 | 3 |
| 9 | 104 | 0 |
| 10 | 72 | 0 |
| 11 | 67 | 0 |
| 12 | 261 | 1 |
| 13 | 76 | 0 |
| 14 | 785 | 52 |
| 15 | 207 | 0 |
| 16 | 1974 | 5 |
| 17 | 69 | 0 |
| 18 | 138 | 0 |
| 19 | 2 | 0 |
| 21 | 1 | 0 |
| 22 | 2 | 0 |
| 23 | 45 | 0 |
| 24 | 1600 | 0 |
| total | 68954 | 2348 |
Hour-by-hour breakdown of number of zero-emitting sources:
| hour | sources | |
| 1 | 6727 | |
| 2 | 6679 | |
| 3 | 6470 | |
| 4 | 6329 | |
| 5 | 6327 | |
| 6 | 6125 | |
| 7 | 5292 | |
| 8 | 3505 | |
| 9 | 1803 | |
| 10 | 1665 | |
| 11 | 1663 | |
| 12 | 1657 | |
| 13 | 1652 | |
| 14 | 1650 | |
| 15 | 1700 | |
| 16 | 2612 | |
| 17 | 4452 | |
| 18 | 4960 | |
| 19 | 5141 | |
| 20 | 5149 | |
| 21 | 5205 | |
| 22 | 5294 | |
| 23 | 5576 | |
| 24 | 7605 |