‘N-MNYS_5_WG_CLOSE’ constraint set invoked, because of unplanned outage of Yass – Marulan 5 330kV line
At 16:16 (NEM time) on Wednesday 10th December 2025 there was an unplanned outage of Yass - Marulan 5 330kV line.
All Posts
Yo-yo-ing of ‘Market Demand’ in South Australia – on Wednesday 10th December 2025
Whilst today saw the release of the draft 2026 ISP, some 'challenges of the future' are already here today - such as the increasingly large and common gyrations in 'Market Demand' seen in South...
Another example of (presumably VRE-induced) weakness in mainland frequency – Wednesday afternoon 10th December 2025
We can see that the frequency weakened late in the afternoon (Wednesday 10th December 2025), falling down towards the Normal Operating Frequency Band.
Victorian Auditor-General’s report ‘Managing the Transition to Renewable Energy’
We thought it might be useful to point directly to the 61-page report ‘Managing the Transition to Renewable Energy’ by the Victorian Auditor-General.
AEMO releases draft of 2026 ISP
Today (Wednesday 10th December 2025) the AEMO has released the much-awaited* draft of the (upcoming 2026 iteration of the) Integrated System Plan .
The long-term trend of forecast errors for daily peak demand in QLD over the past seven summers
A look at how AEMO’s short-term forecasts have performed at the daily peak in Queensland over the past seven summers — and how that performance is changing as rooftop PV grows.
Wellington North Solar Farm back to 94 ELAV compared to 104 in total
Third article in the series, we take a look at the specifics of how much of Wellington North Solar Farm is back online (at Tuesday morning 9th December 2025).
Early morning price volatility in South Australia on Monday 8th December 2025
There was some early morning price volatility in South Australia on Monday 8th December 2025 - a social media update from Michael Caravaggio from EPRI internationally prompts this article.
Wellington North Solar Farm back online (late Sunday afternoon 7th December and) Monday 8th December 2025
The Wellington North Solar Farm (which came offline Sunday 7th December 2025 due to grass fire) is back online.
Wellington North Solar Farm offline in ST PASA data from Saturday 6th December 2025, following grassfire
Just after 13:00 (NEM time) on Saturday 6th December 2025, the Wellington North Solar Farm came offline following a grass fire onsite.
Guest Authored Posts
What the hail is happening with Brisbane’s weather?
Anthony Cornelius from WeatherWatch explains the climate drivers behind Southeast Queensland’s unusually intense 2025 hail season — context that matters for those tracking how extreme weather is evolving and influencing the energy market.
Why network outages matter for generator and storage revenue, risk and investment decisions
Nadali Mahmoudi from EPEC Group presents a short case study to show why network-outage modelling is essential for understanding revenue opportunities, curtailment risk and long-term investment decisions.
Detailed Analysis
The long-term trend of forecast errors for daily peak demand in QLD over the past seven summers
A look at how AEMO’s short-term forecasts have performed at the daily peak in Queensland over the past seven summers — and how that performance is changing as rooftop PV grows.
One example of why some batteries were charging during price spikes over the past couple of days in NSW
This article looks at the N::N_CNLT_2 transient stability constraint on Tuesday to give an example of why some NSW batteries ended up charging through Tuesday’s price spike.
Extending the tabulated history of significant (Frequency and/or AggROT) events into 2025 Q3 and 2025 Q4
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).
A case study into reserve uncertainty during peak demand events in the NEM
A summary of a recent academic case study looking into the events of January 22, 2024 in the QLD region, revealing how DER dynamics, weather variability and forecast limitations are amplifying operational challenges.
Are CIS-ters doin’ it for themselves? Part 4: Policy lessons highlighted by the Nelson Review
In the final part of our four-part CIS series, we zoom out to examine what government-backed Contract-for-Difference schemes are really achieving — drawing on policy lessons from the Nelson Review.
The ENTSO-E ‘Factual Report’ on ‘Grid Incident in Spain and Portugal on 28 April 2025’ is out
Some of our readers will be interested to note that the Factual Report into the ‘Grid Incident in Spain and Portugal on 28 April 2025’ was released on 3rd October 2025.
Are CIS-ters doin’ it for themselves? Part 3: Treatment of curtailment risk
In part three in this series about the CIS, we look at how a curtailment provision — briefly included in drafts for Tender 1 but later removed — may raise questions about how revenue...
Are CIS-ters doin’ it for themselves? Part 2: Understanding why there are delivery challenges
In part two of this four part series about the success of the CIS so far, we explore why delivery challenges may have emerged.