Looking ahead to Friday afternoon/evening 19th December 2025 in NSW
At 07:55 NEM time on Friday 19th December 2025 we take a look towards this afternoon/evening.
Eventful days in 2025
A catalogue of articles pertaining to eventful days in 2025
That’s a wrap, on Thursday evening 18th December 2025
Wrapping up a series of articles on Thursday 18th December 2025 with this NEMwatch snapshot at 19:35 (NEM time).
The violation of the ‘N>NIL_998_18’ constraint equation
Documenting the violation of the ‘N>NIL_998_18’ constraint equation on Thursday 18th December 2025.
About the delay in expected return to service of Vales Point 5
This morning we noted the delay in return to service for Vales Point unit 5 - here, we take a look.
Evening volatility underway in NSW on Thursday 18th December 2025
Thursday evening 18th December 2025 is upon us now, and the volatility in NSW has commenced – as we see in this NEMwatch snapshot at 18:20 (NEM time).
AEMO signals intention to negotiate RERT contracts as evening supply–demand tightens in NSW on Thursday 18th December 2025
In the last few minutes the AEMO have issued a market notice signalling its intention to commence RERT negotiations for the NSW region during this evening’s predicted period of supply-demand tightness.
‘Actual LOR1’ in NSW from 15:43 on Thursday 18th December 2025
At 15:43 (NEM time) on Thursday 18th December 2025, the AEMO issued MN131786 noting 'Actual LOR1' in NSW.
Forecast violation for 3 x System Normal constraint equations on Thursday evening 18th December 2025
Another short note as Thursday afternoon 18th December 2025 advances, to flag the forecast violation of 3 different constraint equations in NSW this evening.
The ‘#NSW1_E_20251218’ constraint equation, on Thursday 18th December 2025
A quick note, about the ‘#NSW1_E_20251218’ constraint equation (which is invoked in the ‘#NSW1_E_20251218’ constraint set) – at the 13:00 dispatch interval (NEM time) early Thursday afternoon 18th December 2025.
‘Sometimes diversity does not help’ … such as on Friday 31st October 2025
On Wednesday 3rd December, the AEMO held its annual Intermittent Generation Forum and discussed a number of different aspects of challenges and opportunities, including with respect to the frequency weakness on Friday 31st October...
The ‘forecast LOR3’ that persisted through the night slips back to ‘forecast LOR2’ … but might rise again
Someone’s just asked me, so for the benefit of readers I’ve shared below a zoomed-in version of that last ez2view window (now at 08:50 NEM time Thursday 18th December 2025) for an updated view.
How much Semi-Scheduled VRE expected to be available on Thursday evening 18th December 2025?
Other factors in the forecast LOR3 we're currently seeing for NSW on Thursday evening 18th December 2025 is what's forecast to happen to Semi-Scheduled VRE output.
How many coal units in NSW expected to be available on Thursday evening 18th December 2025?
One factor in the forecast LOR3 we're currently seeing for NSW on Thursday evening 18th December 2025 is that 4 of 12 coal units in NSW are offline (and another has a story).
Forecast tight supply-demand balance this evening upgraded to forecast LOR3 (i.e. load shedding) in NSW, Thursday 18th December 2025
At the 05:50 dispatch interval NEM time on Thursday 18th December 2025, the AEMO is forecasting LOR3 (i.e. load shedding) for NSW this evening.
A quick look for updates about Waratah BESS, on Wednesday 17th December 2025
At Wednesday 17th December 2025, it’s approaching 4 weeks since Friday 21st November 2025 (when we last looked at Waratah BESS), so we take an updated look ...
Blast of hot weather drives ‘forecast LOR2’ in NSW and SA on Thursday 18th December 2025
At 10:24 (NEM time) on Wednesday 17th December 2025 the AEMO issued its latest ‘NEM Local Temperature Alerts’ Market Notice, and this one’s a long one that spans all four mainland regions in the...
A short first article, about the ‘N^^N_NIL_WGLT’ constraint equation
Some first initial notes about the ‘N^^N_NIL_WGLT’ constraint equation ... which was earlier flagged as a 'N::N_NIL_WGLT' constraint equation (and has been referred to as ‘N>>N_NIL_WGLT’ constraint equation).
AER announces that it has instituted proceedings against Transgrid following 2024 Broken Hill outages
On Wednesday 17th December 2025, the AER announced here that it had ‘… instituted proceedings against Transgrid following 2024 Broken Hill outages’.
CSIRO releases draft of ‘2025-26 GenCost Report’ for consultation
As another stocking stuffer for your holiday reading, today (Wednesday 17th December 2025) the CSIRO has released its draft of the next iteration of the much-awaited and often debated GenCost report.
‘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.