Callide C3 has returned to service today following last week’s control system trip that took both C units offline, while C4 remains out of service with its return currently expected tomorrow.
The trip coincided with the drop in frequency, which happened at the start of the dispatch interval.
A short note to capture the trip of Callide B2 on Tuesday 28th October 2025 in the five minute period prior to 21:01 (NEM time) that day.
The Callide C4 unit tripped from 420MW in the 5 minutes to 18:36 (NEM time) on Sunday evening 26th October 2025, delivering a sharp drop in mainland frequency.
System frequency remained within the NOFB, appears well managed given the supply loss approached 600 MW.
In July 2025 AEMO released the final report into the review of the major power system event of 13 February 2024.
A count of coal generator events indicates large unit trips are less frequent.
A short note because of a 295MW drop in output from Loy Yang A3 just prior to 14:06 (NEM time) on Tuesday 20th May 2025.
At 16:55 on 26th November 2024 AEMO advised three of four units at Uranquinty tripped, during a forecast LOR1 condition which then became an actual LOR1 condition.
A quick contemporaneous record of the trip of the Tarong North Power station unit on Monday evening 19th August 2024.
It's Monday 8th April, the two Eraring units that tripped last week are back online - and I wonder what the cause of the coincident trip was?
The two Eraring units that had tripped on Wednesday 3 April 2024 were returned to service by 11pm that evening.
Fourth article on Wed 3rd April 2024, pertaining to the earlier coincident trip of ER01 and ER02 units at Eraring Power Station.
AEMO Market Notice 115944 notifies that the coincident trip of ER01 and ER02 was at 13:22 NEM time on Wednesday 3rd April 2024.
In this second short article for the day, we Time-Travel ez2view back to 4 x Dispatch Intervals surrounding the coincident trip of ER01 and ER02 at Eraring Power Station.
A first article noting simultaneous trip of Eraring units 1 and 2 on Wednesday afternoon 3rd April 2024.
TARONG#1 has come offline from close to minimum load this morning, closely followed by TARONG#2 (also from close to minimum load) - Wednesday 28th February 2024
Curiosity (part triggered by some conversations I noticed on social media) drove me to have a look at the implied ROCDOWN in the AEMO 4-second data for the 5 facilities (10 DUIDs) involved in rapid ramp down on Tuesday 13th February 2024.
Grid frequency had dropped to 49.689 Hz. We take an initial look into the timeseries of grid frequency recorded on the day.
Guest author, Allan O'Neil, adds some insights in a rapidly evolving situation on Tuesday afternoon 13th February 2024 in Victoria.