Eastern Interconnection Frequency Events

Generated by the PSFM-1 Frequency Recorder

(updated as events are recorded.)
All times are UTC.
Generated at 12:35:03 10-Jul-2025 UTC.

Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/01/25 04:00:05 04:00:09 -0.026 -0.0051 VT ROC
07/01/25 04:00:06 04:00:11 -0.026 -0.0047 Delta -
07/01/25 14:16:50 14:16:59 -0.058 -0.0097 VT ROC
07/01/25 14:16:49 14:17:03 -0.060 -0.0085 Delta -
07/01/25 15:02:20 15:02:24 -0.025 -0.0058 VT ROC
07/01/25 15:02:22 15:02:29 -0.027 -0.0045 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/02/25 04:00:06 04:00:09 -0.022 -0.0040 VT ROC
07/02/25 11:00:07 11:00:15 -0.027 -0.0035 Delta -
07/02/25 11:01:58 11:02:02 0.024 0.0036 Delta +
07/02/25 14:30:43 14:30:51 0.028 0.0036 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/03/25 13:01:46 13:01:47 0.021 0.0036 VT ROC


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/04/25 00:00:05 00:00:09 -0.027 -0.0038 VT ROC
07/04/25 04:00:06 04:00:10 -0.026 -0.0048 VT ROC
07/04/25 04:00:05 04:00:12 -0.027 -0.0041 Delta -
07/04/25 14:13:00 14:13:05 0.025 0.0036 Delta +
07/04/25 17:00:05 17:00:09 -0.031 -0.0044 VT ROC
07/04/25 17:00:03 17:00:14 -0.032 -0.0041 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/05/25 00:00:04 00:00:09 -0.033 -0.0049 VT ROC
07/05/25 00:00:02 00:00:13 -0.035 -0.0041 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/06/25 04:00:06 04:00:08 -0.020 -0.0043 VT ROC
07/06/25 05:00:05 05:00:09 -0.026 -0.0048 VT ROC
07/06/25 05:00:05 05:00:11 -0.026 -0.0040 Delta -
07/06/25 09:40:29 09:40:32 0.029 0.0042 VT ROC
07/06/25 09:40:26 09:40:35 0.030 0.0037 Delta +
07/06/25 12:00:05 12:00:10 -0.028 -0.0041 VT ROC
07/06/25 12:00:05 12:00:13 -0.029 -0.0041 Delta -
07/06/25 13:40:13 13:40:17 0.030 0.0039 VT ROC
07/06/25 13:40:10 13:40:20 0.031 0.0037 Delta +
07/06/25 14:47:35 14:47:39 0.025 0.0045 VT ROC
07/06/25 14:47:35 14:47:42 0.027 0.0041 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/07/25 01:04:57 01:05:36 59.936   Under 59.940
07/07/25 04:00:06 04:00:09 -0.026 -0.0046 VT ROC
07/07/25 04:00:06 04:00:13 -0.027 -0.0040 Delta -
07/07/25 12:21:18 12:21:30 0.030 0.0037 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/08/25 00:00:06 00:00:08 -0.024 -0.0035 VT ROC
07/08/25 15:53:57 15:54:01 -0.031 -0.0056 VT ROC
07/08/25 15:53:57 15:54:08 -0.034 -0.0047 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/09/25 00:00:06 00:00:09 -0.027 -0.0043 VT ROC
07/09/25 00:00:04 00:00:12 -0.028 -0.0037 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
07/10/25 12:34:42 12:34:50 0.029 0.0036 Delta +


PSFM Hardware and software by Robert M. Orndorff
Generated at 12:35:03 10-Jul-2025 UTC.
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