Highlighting particular (frequency and/or AggROT) events through 2024 and 2025
In this article, we tie together various events since 1st January 2024 that featured either System Frequency outside the NOFB and large AggROT for Semi-Scheduled assets.
Aggregate Raw Off-Target
An updated tabular list of instances of large AggROT across Semi-Scheduled units
Earlier today we trended the incidence of large Aggregate Raw Off-Target across all Semi-Scheduled units. In this updated tabulated list, we list each of the largest instances from January 2024 to June 2025.
An updated long-range trend of large instances of Aggregate Raw Off-Target (AggROT) across all Semi-Scheduled units
It's ~18 months since we took a look at the trend of large instances of Aggregate Raw Off-Target across all Semi-Scheduled units. In this article we update the analysis with data to 30th June...
Three broader questions (re)triggered by the Frequency Spike on Tuesday 19th August 2025
The (concerning) frequency spike across the NEM in the middle of the day (Tuesday 19th August 2025) has triggered many proximate questions - understandable - but also has raised these 3 Broader Questions.
Unit deviations from target on Tuesday 19th August 2025
It appears it was unit availability used to set the target for dispatch that went awry, rather than unit output.
Which units show large positive Dispatch Error for 15:40 on Monday 16th June 2025
Following on from Linton's article (about the frequency drop at 15:40 on Monday 16th June 2025) we take a look at the largest harmful Dispatch Errors across the full fleet of units ... and...
Across 188 Semi-Scheduled DUIDs – Dispatch Error at 16:15 on Monday 26th May 2025
This is my second article today relating to events on Monday 26th May 2025 - with this article looking at Dispatch Error for each of the 188 x Semi-Scheduled units to 16:15.
Poor dispatch performance of VRE (collectively) on Monday 26th May 2025 sufficiently large to drive frequency outside of NOFB
Prior to the Brisbane session of the Nelson Review Panel (on Thu 29th May 2025) we take a look at Dispatch Error in the 16:15 dispatch interval on Monday 26th May 2025 to see...
Case Study of 14:15 on Thursday 22nd February 2024 (large collective under-performance across all Semi-Scheduled units)
In part 2 of a Case Study about Thursday 22nd February 2024 - specifically looking at Aggregate Dispatch Error across all Semi-Scheduled units (and in this part 2 looking just at 14:15).
Aggregate Dispatch Error across all Semi-Scheduled units (NEM-wide) throughout Thursday 22nd February 2024
Finding some time to make some progress in compiling GenInsights Quarterly Updates for 2024 Q1, here's a short Case Study of Thursday 22nd February 2024 (a day that saw significant collective under-performance of Semi-Scheduled...
A long-range trend of large instances of Aggregate Raw Off-Target (AggROT) across all Semi-Scheduled units
The second article today (falling out of analysis for GenInsights Quarterly Update for 2023 Q4) presenting a long-term trend of the incidence of large instances of Aggregate Raw Off-Target across the growing number of...
A 20-year trend of large instances of Aggregate Raw Off-Target (AggROT) across 44 x coal units to 31st Dec 2023
A first article today (falling out of analysis for GenInsights Quarterly Update for 2023 Q4) presenting a long-term trend of the incidence of large instances of Aggregate Raw Off-Target across the 44 x operational...
Tuesday 31st October 2023 sees the only two instances (in Q4, and all year) of AggROT for Semi-Scheduled units < -500MW
Also from GenInsights Quarterly Updates for 2023 Q4, the particular case of Tuesday 31st October 2023 is also worth sharing (and a broad audience understanding).
Large instances of collective under-performance across all Semi-Scheduled units on Sunday 24th December 2023
Returning a focus to GenInsights Quarterly Updates for 2023 Q4, here's a particular example from Sunday 24th December 2023 worth sharing (and a broad audience understanding).
Aggregate Dispatch Error across all Semi-Scheduled units (NEM-wide) throughout Tuesday 13th February 2024
Looking back at Tuesday 13th February 2024 there's consistently large aggregate under-performance (compared to Target) across all Semi-Scheduled units in the NEM through daylight hours. The reason for the increased procurement of Regulation Raise.
Case Study (part 1) of large collective under-performance for Semi-Scheduled assets on Friday 18th August 2023
A brief article as a first Case Study looking at Friday 18th August 2023, in conjunction with the compilation of GenInsights Quarterly Updates for 2023 Q3.
Case Study of Tuesday 16th February 2021 (Part 1) … large instance of collective over-performance for Semi-Scheduled units
Another short article today presenting an overview of Aggregate Raw Off-Target (AggROT) for Semi-Scheduled units on 16th February 2021 (the largest incidence of collective over-performance at that time).
Case Study of Tuesday 23rd August 2022 (Part 1) … large instance of collective over-performance for Semi-Scheduled units
Another short article today (from GenInsights Quarterly Update for Q3 2022) presenting an overview of Aggregate Raw Off-Target (AggROT) for Semi-Scheduled units on 23rd August 2022.
Case Study of Friday 20th January 2023 (Part 1) … large instance of collective over-performance for Semi-Scheduled units
Another short article today (also from GenInsights Quarterly Update for Q1 2023) presenting an overview of Aggregate Raw Off-Target (AggROT) for Semi-Scheduled units on Friday 20th January 2023.
Case Study of Friday 3rd February 2023 (Part 1) … two consecutive large instances of collective under-performance for Semi-Scheduled units
A short article today (whilst in the midst of finalising GenInsights Quarterly Update for Q1 2023) presenting an overview of Aggregate Raw Off-Target (AggROT) for Semi-Scheduled units on Friday 3rd February 2023.