Eastern Interconnection Frequency Events

Generated by the PSFM-1 Frequency Recorder

(updated as events are recorded.)
All times are UTC.
Generated at 04:00:17 16-Jun-2025 UTC.

Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/01/25 04:00:05 04:00:10 -0.032 -0.0059 VT ROC
06/01/25 04:00:05 04:00:13 -0.033 -0.0051 Delta -
06/01/25 06:10:42 06:10:47 0.030 0.0040 VT ROC
06/01/25 06:10:41 06:10:50 0.031 0.0039 Delta +
06/01/25 09:00:07 09:00:09 -0.022 -0.0035 VT ROC
06/01/25 10:11:21 10:11:24 0.029 0.0040 VT ROC
06/01/25 10:11:19 10:11:29 0.030 0.0036 Delta +
06/01/25 12:30:24 12:30:27 0.024 0.0038 VT ROC
06/01/25 12:30:25 12:30:30 0.026 0.0037 Delta +
06/01/25 13:10:29 13:10:32 0.024 0.0038 VT ROC
06/01/25 16:25:09 16:25:11 0.023 0.0039 VT ROC
06/01/25 16:25:11 16:25:18 0.027 0.0038 Delta +
06/01/25 17:05:21 17:05:23 0.033 0.0043 VT ROC
06/01/25 17:05:24 17:05:26 0.034 0.0042 VT ROC
06/01/25 17:05:17 17:05:31 0.035 0.0044 Delta +
06/01/25 18:54:36 18:54:38 -0.025 -0.0036 VT ROC
06/01/25 23:44:07 23:44:09 -0.021 -0.0036 VT ROC


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/02/25 05:00:06 05:00:09 -0.020 -0.0037 VT ROC
06/02/25 08:40:30 08:40:31 0.027 0.0037 VT ROC
06/02/25 08:40:27 08:40:36 0.028 0.0037 Delta +
06/02/25 09:05:58 09:06:01 0.029 0.0044 VT ROC
06/02/25 09:05:55 09:06:03 0.030 0.0043 Delta +
06/02/25 16:00:05 16:00:08 -0.024 -0.0041 VT ROC
06/02/25 17:57:11 17:57:12 0.028 0.0038 VT ROC
06/02/25 22:59:20 22:59:24 -0.026 -0.0042 VT ROC
06/02/25 22:59:21 22:59:28 -0.028 -0.0039 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/03/25 01:36:46 01:36:50 -0.028 -0.0042 VT ROC
06/03/25 01:36:47 01:36:56 -0.031 -0.0040 Delta -
06/03/25 04:00:05 04:00:09 -0.025 -0.0047 VT ROC
06/03/25 04:00:06 04:00:10 -0.025 -0.0041 Delta -
06/03/25 10:02:27 10:02:29 0.027 0.0037 VT ROC
06/03/25 10:02:25 10:02:35 0.029 0.0036 Delta +
06/03/25 10:11:22 10:11:24 0.026 0.0045 VT ROC
06/03/25 10:11:25 10:11:26 0.030 0.0037 VT ROC
06/03/25 10:11:22 10:11:31 0.031 0.0042 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/04/25 00:00:06 00:00:09 -0.028 -0.0037 VT ROC
06/04/25 00:00:03 00:00:12 -0.029 -0.0039 Delta -
06/04/25 00:09:50 00:09:52 -0.022 -0.0038 VT ROC
06/04/25 00:09:51 00:09:56 -0.025 -0.0036 Delta -
06/04/25 04:00:05 04:00:10 -0.031 -0.0055 VT ROC
06/04/25 04:00:05 04:00:13 -0.031 -0.0048 Delta -
06/04/25 09:00:05 09:00:09 -0.031 -0.0054 VT ROC
06/04/25 09:00:05 09:00:14 -0.032 -0.0047 Delta -
06/04/25 20:42:23 20:42:27 -0.024 -0.0051 VT ROC
06/04/25 20:42:24 20:42:29 -0.025 -0.0041 Delta -
06/04/25 23:00:05 23:00:09 -0.028 -0.0050 VT ROC
06/04/25 23:00:04 23:00:13 -0.028 -0.0042 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/05/25 04:00:06 04:00:09 -0.024 -0.0046 VT ROC
06/05/25 04:00:06 04:00:10 -0.024 -0.0039 Delta -
06/05/25 05:00:05 05:00:09 -0.028 -0.0048 VT ROC
06/05/25 05:00:03 05:00:13 -0.029 -0.0041 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/06/25 04:00:06 04:00:09 -0.027 -0.0051 VT ROC
06/06/25 04:00:06 04:00:13 -0.028 -0.0044 Delta -
06/06/25 05:00:05 05:00:09 -0.030 -0.0048 VT ROC
06/06/25 05:00:04 05:00:14 -0.031 -0.0043 Delta -
06/06/25 09:50:56 09:50:57 0.025 0.0038 VT ROC
06/06/25 09:50:54 09:51:01 0.026 0.0038 Delta +
06/06/25 10:00:06 10:00:09 -0.026 -0.0038 VT ROC
06/06/25 10:00:04 10:00:11 -0.027 -0.0037 Delta -
06/06/25 23:10:53 23:10:56 -0.028 -0.0059 VT ROC
06/06/25 23:10:53 23:11:03 -0.032 -0.0047 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/07/25 13:15:30 13:15:34 -0.028 -0.0054 VT ROC
06/07/25 13:15:30 13:15:38 -0.029 -0.0049 Delta -
06/07/25 14:05:09 14:05:13 0.029 0.0050 VT ROC
06/07/25 14:05:09 14:05:19 0.031 0.0044 Delta +
06/07/25 15:15:30 15:15:31 0.024 0.0036 VT ROC
06/07/25 21:47:06 21:47:08 -0.024 -0.0036 VT ROC
06/07/25 23:00:07 23:00:09 -0.023 -0.0038 VT ROC
06/07/25 23:00:07 23:00:15 -0.026 -0.0036 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/08/25 13:55:10 13:55:14 0.026 0.0043 VT ROC
06/08/25 13:55:11 13:55:17 0.027 0.0041 Delta +
06/08/25 14:07:48 14:07:49 0.024 0.0035 VT ROC
06/08/25 14:07:48 14:08:01 0.034 0.0036 Delta +
06/08/25 16:04:38 16:04:39 0.027 0.0035 VT ROC


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/09/25 03:12:05 03:12:07 -0.028 -0.0038 VT ROC
06/09/25 03:12:04 03:12:12 -0.029 -0.0036 Delta -
06/09/25 04:00:05 04:00:10 -0.030 -0.0054 VT ROC
06/09/25 04:00:04 04:00:11 -0.031 -0.0048 Delta -
06/09/25 09:00:06 09:00:09 -0.026 -0.0042 VT ROC
06/09/25 09:00:04 09:00:11 -0.027 -0.0036 Delta -
06/09/25 11:52:49 11:52:56 -0.027 -0.0039 Delta -
06/09/25 12:29:15 12:29:17 0.027 0.0036 VT ROC
06/09/25 12:29:13 12:29:24 0.031 0.0038 Delta +
06/09/25 13:00:07 13:00:11 -0.024 -0.0037 Delta -
06/09/25 13:12:24 13:12:26 0.026 0.0040 VT ROC
06/09/25 13:43:16 13:43:24 0.027 0.0036 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/10/25 04:00:05 04:00:09 -0.027 -0.0051 VT ROC
06/10/25 04:00:05 04:00:12 -0.028 -0.0045 Delta -
06/10/25 10:41:37 10:41:42 0.031 0.0045 VT ROC
06/10/25 10:41:38 10:41:48 0.033 0.0043 Delta +
06/10/25 11:00:06 11:00:11 -0.031 -0.0047 VT ROC
06/10/25 11:00:05 11:00:15 -0.032 -0.0045 Delta -
06/10/25 11:04:32 11:04:34 0.027 0.0036 VT ROC
06/10/25 13:00:06 13:00:09 -0.023 -0.0041 VT ROC


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/11/25 06:00:07 06:00:09 -0.026 -0.0041 VT ROC
06/11/25 06:00:05 06:00:12 -0.027 -0.0037 Delta -
06/11/25 10:00:07 10:00:13 -0.033 -0.0046 VT ROC
06/11/25 10:00:06 10:00:17 -0.034 -0.0043 Delta -
06/11/25 12:45:31 12:45:33 0.029 0.0041 VT ROC
06/11/25 12:45:28 12:45:37 0.030 0.0039 Delta +
06/11/25 14:56:50 14:56:52 -0.023 -0.0038 VT ROC
06/11/25 14:56:50 14:56:59 -0.028 -0.0036 Delta -
06/11/25 15:13:17 15:13:19 0.025 0.0043 VT ROC
06/11/25 15:13:17 15:13:26 0.030 0.0037 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/12/25 11:00:07 11:00:09 -0.022 -0.0038 VT ROC


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/13/25 04:00:06 04:00:09 -0.024 -0.0048 VT ROC
06/13/25 04:00:06 04:00:10 -0.025 -0.0041 Delta -
06/13/25 10:00:05 10:00:08 -0.026 -0.0040 VT ROC
06/13/25 10:00:04 10:00:11 -0.027 -0.0036 Delta -
06/13/25 10:33:59 10:34:01 -0.029 -0.0043 VT ROC
06/13/25 10:33:55 10:34:04 -0.030 -0.0039 Delta -
06/13/25 12:11:11 12:11:16 0.031 0.0051 VT ROC
06/13/25 12:11:10 12:11:18 0.032 0.0045 Delta +
06/13/25 22:35:20 22:35:24 -0.025 -0.0050 VT ROC
06/13/25 22:35:21 22:35:25 -0.025 -0.0041 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/14/25 00:00:05 00:00:09 -0.033 -0.0047 VT ROC
06/14/25 00:00:02 00:00:15 -0.034 -0.0044 Delta -
06/14/25 04:00:06 04:00:08 -0.020 -0.0039 VT ROC
06/14/25 08:51:00 08:51:08 0.051 0.0097 VT ROC
06/14/25 08:50:59 08:51:11 0.052 0.0085 Delta +
06/14/25 09:37:33 09:37:37 0.031 0.0048 VT ROC
06/14/25 09:37:32 09:37:41 0.032 0.0044 Delta +
06/14/25 10:26:40 10:26:42 0.026 0.0043 VT ROC
06/14/25 10:26:39 10:26:45 0.027 0.0036 Delta +
06/14/25 21:56:28 21:56:29 -0.023 -0.0043 VT ROC
06/14/25 21:56:28 21:56:36 -0.028 -0.0041 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/15/25 11:01:47 11:01:56 0.029 0.0036 Delta +
06/15/25 12:58:29 12:58:34 0.033 0.0043 VT ROC
06/15/25 12:58:26 12:58:38 0.034 0.0044 Delta +
06/15/25 14:31:22 14:31:28 0.032 0.0044 VT ROC
06/15/25 14:31:21 14:31:31 0.033 0.0044 Delta +
06/15/25 16:50:47 16:50:49 0.029 0.0043 VT ROC
06/15/25 16:50:44 16:50:55 0.030 0.0039 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
06/16/25 01:00:05 01:00:09 -0.027 -0.0042 VT ROC
06/16/25 01:00:04 01:00:11 -0.027 -0.0036 Delta -
06/16/25 04:00:06 04:00:10 -0.027 -0.0050 VT ROC
06/16/25 04:00:07 04:00:15 -0.029 -0.0047 Delta -


PSFM Hardware and software by Robert M. Orndorff
Generated at 04:00:17 16-Jun-2025 UTC.
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