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Arclight

Substation 4 · Northern ring

Grid operations

Planned work tonight on the northern ring

Two feeders come out between 23:00 and 04:00 for pole replacement on the Fell Side spur. Expect the ring load to shift east while the work lasts.

Right now

Nominal
Load on the ring 412.6 MW +2.1 % vs the same hour yesterday Peak was 448 MW at 19:40
Feeders online 46 of 48 feeders in total Two out for maintenance
Open alerts 3 one more than at 06:00 All of severity “watch”
Frequency 49.98 Hz Inside the 49.8–50.2 Hz band

Feeders

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Table Job queue Shift notes

Table

Feeders on the northern ring, with district, load, last switching and state.
Feeder District Load (MW) Last switched State
F-04 Harbour East 31.4 Closed
F-07 Mill Lane North 18.9 Closed
F-12 Quarry Road West 44.2 Watch
F-18 Beacon Hill North 7.6 Open for work
F-21 Saltings East 26.0 Closed
F-29 Fell Side West 52.8 Fault logged
F-33 Airfield South 12.1 Closed
F-41 Old Dock South 38.5 Watch

Job queue

Reclose test, F-12

Queued 08:40 · operator AM

Thermal survey, T-2

Queued 09:15 · operator CW

Reload sample data at the top of the page swaps these two cards for loading skeletons for about a second and puts them back: that is the skeleton component, with nothing fetched.

Shift notes

  1. Handover from the night shift

    Two feeders left open for planned work.

  2. Reclose test queued on F-12

    Requested by the district team.

  3. Thermal survey under way on T-2

    Oil temperature watched every ten minutes.

  4. Maintenance window opens

    Pole replacement on the Fell Side spur, four hours.

Alerts and notes

Watch: oil temperature rising on T-2

78 °C against a 90 °C limit, up 4 degrees in an hour.

Severity levels

Watch is a reading drifting towards a limit; fault is a protection operation already cleared.

Request a maintenance window

Planning

The fields validate in the browser. Nothing is submitted, booked or stored: submitting shows a notification and stops there.

Between 16 September 2026 and 31 December 2026. The field shows and accepts the date in your browser's own format.

Notifications

Trip feeder F-12?

On a live console this would open a breaker and cut supply to a district. Here there is no breaker and no connection: confirming only shows a notification.