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X5.1 solar flare, G4 geomagnetic storm watch

(www.spaceweatherlive.com)
391 points sva_ | 2 comments | 11 Nov 25 21:18 UTC | HN request time: 0.001s | source
1. Animats ◴[12 Nov 25 05:51 UTC] No.45896772[source]▶
US power grid info:

PJM:

    Geomagnetic Disturbance Warning 
    11.11.2025 19:25 (PJM times are Eastern Standard).

    PJM-RTO
A Geomagnetic Disturbance Warning has been issued for 19:25 on 11.11.2025 through 04:00 on 11.12.2025 . A GMD warning of K7 or greater is in effect for this period.

This is only a warning. There are no listed actions being taken. When you see Geomagnetic Disturbance Action, not just Warning, there's a problem. That happened most recently on June 1, 2025. Extra people are probably on standby all night in case something happens.

CAISO: Nothing.

ERCOT: Nothing.

Hydro-Québec: Multiple snow-related outages near Montreal and some other locations.

Background info from the last time HN got wound up about this.[1]

[1] https://news.ycombinator.com/item?id=44152154

replies(1): >>45905228 #
2. Animats ◴[12 Nov 25 19:40 UTC] No.45905228[source]▶
PJM warning is still in effect as of the next morning, but there are still no related actions.