We start with this unbundled listing of 402 discrete stories about the performance of Semi-Scheduled units (115 solar & 86 wind) units on Friday 10th and Saturday 11th April with the frequency spikes.
With the advantage of 'next day public' data we look at 'Dispatch Error' (for all 201 Semi-Scheduled units) at 14:20 on Saturday 11th April 2026 to see what drove the frequency spike outside of the NOFB. There was a big imbalance...
In Part 5, we’ll look at Dispatch Error for all Wind Farm Units (i.e. the Semi-Scheduled ones only) at 03:05 on Thursday 2nd April 2026, following the trip of Kogan Creek.
This is the 1st of two articles today … this one specifically focused on Large Solar (i.e. the Semi-Scheduled units) and the aggregate Dispatch Error across all 288 dispatch intervals on Tuesday 27th January 2026.
This latest instalment of our annual review into solar and wind farm curtailment across the NEM, looks at outcomes in 2025 and highlights increasingly divergent results by region and by asset as network constraints, pricing dynamics and seasonal weather conditions interact.
Following a growing number of articles on WattClarity about “VRE under-performance dragging frequency down”, guest author Allan O'Neil takes a look at how the one sided nature of the SDC plays a role - and suggests a possible action that would help.
We’ve already posted about how ‘Mainland Frequency dragged downwards around sunset, on Sunday 30th November 2025’. Here, we see how underperformance across Large Solar Farms was a major cause.
An update of earlier article (from 8th Sept 2025) comparing Frequency Excursions with instances of large AggROT across Semi-Scheduled units - for 2025 Q3 and 2025 Q4 (ytd).
We’ve just noted the frequency drop on Friday afternoon 31st October 2025, and so take a look at 'Aggregate Dispatch Error’, to see if it's likely we are correct in our hypothesis - that this was another instance of frequency weakness due to Semi-Scheduled unit...
On Sunday (following from the discussion at the NEMdev conference in Brisbane a few weeks ago, and leading into this week’s All Energy 2025 in Melbourne) I highlighted these ‘Two *big concerns* that we urge the Nelson Review panel to (re)consider (with respect to Invisible...
In Part 4 of this evolving Case Study, we take a closer look (using 4-second data) at the 12 x offending Semi-Scheduled units that appear to have played a large role in driving frequency south on late Thursday afternoon 16th October 2025, outside of the...
In Part 3 of this series with respect to Thursday 16th October 2025, we focus on when a large collective under-performance across all Semi-Scheduled Wind Farms and Solar Farms dragged the frequency outside the NOFB - down at 49.824Hz at 16:49:07.6.
Having already noted the ‘Weakness in frequency stability on Thursday afternoon 16th October 2025’, we take a look at the causes - for the four high-profile dispatch intervals.
A zoomed-out view of six metrics supports understanding of physical/technical semi-scheduled generator availability.
Combining together a bundle of different metrics related to the 'availability' of a wind farm, we take a look at what's happened at Bulgana Wind Farm over the past ~25 months.
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.
As the 5th article in an evolving series that progressively explores the (apparent self-forecasting glitch and) frequency spike on Tuesday 19th August 2025, we take an early look at Solar Farm performance.
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.
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 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.