Eastern Interconnection Frequency Events
(updated as events are recorded.)
All times are UTC.
Generated at 11:59:53 07-Dec-2025 UTC.
| Date |
Pickup |
Dropout |
Delta (Hz) |
Slope(Hz/sec) |
Type |
| 12/01/25 |
05:00:05 |
05:00:09 |
-0.024 |
-0.0052 |
VT ROC |
| 12/01/25 |
05:00:05 |
05:00:09 |
-0.024 |
-0.0043 |
Delta - |
| 12/01/25 |
17:27:51 |
17:27:53 |
-0.022 |
-0.0042 |
VT ROC |
| 12/01/25 |
17:27:53 |
17:27:59 |
-0.026 |
-0.0038 |
Delta - |
| Date |
Pickup |
Dropout |
Delta (Hz) |
Slope(Hz/sec) |
Type |
| 12/02/25 |
05:00:05 |
05:00:08 |
-0.023 |
-0.0039 |
VT ROC |
| 12/02/25 |
10:01:22 |
10:01:23 |
0.025 |
0.0039 |
VT ROC |
| 12/02/25 |
10:01:24 |
10:01:26 |
0.026 |
0.0038 |
VT ROC |
| 12/02/25 |
10:01:22 |
10:01:30 |
0.027 |
0.0038 |
Delta + |
| Date |
Pickup |
Dropout |
Delta (Hz) |
Slope(Hz/sec) |
Type |
| 12/03/25 |
10:31:35 |
10:31:37 |
0.028 |
0.0044 |
VT ROC |
| 12/03/25 |
10:31:35 |
10:31:45 |
0.031 |
0.0040 |
Delta + |
| 12/03/25 |
10:40:32 |
10:40:36 |
0.028 |
0.0038 |
VT ROC |
| 12/03/25 |
10:40:30 |
10:40:39 |
0.029 |
0.0040 |
Delta + |
| 12/03/25 |
21:04:56 |
21:04:59 |
0.028 |
0.0041 |
VT ROC |
| 12/03/25 |
21:04:54 |
21:05:01 |
0.029 |
0.0037 |
Delta + |
| Date |
Pickup |
Dropout |
Delta (Hz) |
Slope(Hz/sec) |
Type |
| 12/05/25 |
05:00:07 |
05:00:08 |
-0.022 |
-0.0036 |
VT ROC |
| 12/05/25 |
06:00:07 |
06:00:09 |
-0.025 |
-0.0043 |
VT ROC |
| 12/05/25 |
06:00:07 |
06:00:16 |
-0.028 |
-0.0039 |
Delta - |
| Date |
Pickup |
Dropout |
Delta (Hz) |
Slope(Hz/sec) |
Type |
| 12/06/25 |
00:28:08 |
00:28:12 |
-0.028 |
-0.0043 |
VT ROC |
| 12/06/25 |
00:28:09 |
00:28:18 |
-0.030 |
-0.0042 |
Delta - |
| 12/06/25 |
10:04:53 |
10:04:59 |
-0.045 |
-0.0100 |
VT ROC |
| 12/06/25 |
10:04:51 |
10:05:03 |
-0.046 |
-0.0076 |
Delta - |
| 12/06/25 |
10:04:54 |
10:05:07 |
59.937 |
|
Under 59.940 |
| 12/06/25 |
12:10:15 |
12:10:17 |
0.023 |
0.0038 |
VT ROC |
| 12/06/25 |
21:00:07 |
21:00:10 |
0.030 |
0.0043 |
VT ROC |
| 12/06/25 |
21:00:04 |
21:00:12 |
0.031 |
0.0039 |
Delta + |
| Date |
Pickup |
Dropout |
Delta (Hz) |
Slope(Hz/sec) |
Type |
| 12/07/25 |
00:21:35 |
00:21:38 |
-0.025 |
-0.0048 |
VT ROC |
| 12/07/25 |
00:21:36 |
00:21:44 |
-0.031 |
-0.0042 |
Delta - |
| 12/07/25 |
04:13:51 |
04:13:59 |
-0.046 |
-0.0072 |
VT ROC |
| 12/07/25 |
04:13:50 |
04:14:02 |
-0.047 |
-0.0068 |
Delta - |
| 12/07/25 |
05:00:05 |
05:00:09 |
-0.025 |
-0.0036 |
VT ROC |
| 12/07/25 |
05:00:05 |
05:00:10 |
-0.026 |
-0.0036 |
Delta - |
| 12/07/25 |
11:59:37 |
11:59:43 |
0.034 |
0.0053 |
VT ROC |
| 12/07/25 |
11:59:37 |
11:59:48 |
0.035 |
0.0050 |
Delta + |
PSFM Hardware and software by Robert M. Orndorff
Generated at 11:59:53 07-Dec-2025 UTC.
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