Administered Pricing for FCAS services in South Australia ended on Sunday 24th August 2025 … so what’s next?
On Sunday 24th August 2025, Administered Pricing for FCAS in South Australia ended ... when will the ‘S-TBTU’ constraint set re-emerge?
Articles by Paul McArdle
Paul was one of the founders of Global-Roam in February 2000. He is currently the CEO of the company and the principal author of WattClarity. Writing for WattClarity has become a natural extension of his work in understanding the electricity market, enabling him to lead the team in developing better software for clients.
Before co-founding the company, Paul worked as a Mechanical Engineer for the Queensland Electricity Commission in the early 1990s. He also gained international experience in Japan, the United States, Canada, the UK, and Argentina as part of his ES Cornwall Memorial Scholarship.
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.
AEMO releases 2025 ESOO on Thursday 21st August 2025
On Thursday 21st August 2025 (a week earlier than I'd anticipated) the AEMO has released its 2025 ESOO.
AGL considering State Government request to keep Torrens Island open for two more years
Amongst the news articles this morning that are energy related was one noting a possible delay to the closure of Torrens Island. We take a quick look...
A ~50-day view of rising spurts of volatility in the LOWER1SEC FCAS market in South Australia
With Administered Pricing in South Australia ongoing today, we take a longer-term look (across the past ~50 days) in the escalating pressure on Cumulative Price for LOWER1SEC FCAS in South Australia.
Network outage on Tailem Bend – Tungkillo 275kV line ended Tue 19th Aug, but Administered Pricing Continues into Wed 20th Aug (part 3)
Part 3 in an evolving series of articles about a series of the network outage(s) on the Tailem Bend - Tungkillo 275kV line that's driven LOWER1SEC prices through the roof and triggered Administered Pricing...
Part 2 with respect to Administered Pricing for Lower 1 second FCAS (and 9 other services) in South Australia
With Administered Pricing of all 10 x FCAS products in South Australia continuing into Monday 18th August 2025 (no surprise there), we take a second look.
The ‘2025 Victorian Transmission Plan’ released on Sunday 17th August 2025
On the weekend we noticed the release of the 2025 Victorian Transmission Plan, and thought it worth flagging here.
New ‘lowest ever’ point for ‘Market Demand’ in Queensland, on Sunday 17th August 2025
Another quick article for Sunday 17th August 2025 – this one noting a new 'lowest ever*' point for 'Market Demand' in Queensland, just shaving prior record from a year ago.
Administered pricing for FCAS in South Australia from 05:20 on Sunday 17th August 2025 (part 1)
AEMO notes that 'it has determined that an administered price period will commence at the trading interval starting 0520 on 17 August 2025' for FCAS in South Australia. We take a quick look...
A 292MW drop in ‘Market Demand’ in Tasmania, on Saturday 16th August 2025
A quick first look, following the loss of 292MW of 'Market Demand' in Tasmania to 14:11 (NEM time) on Saturday 16th August 2025.
Eraring Power Station in the news, again … might stay open (even) longer
Briefly recapping some of the news pertaining to Eraring Power Station over the past two days.
Submissions due today (Thu 14th Aug 2025) on the AEMC draft report ‘Review of WDRM’
A belated note that the AEMC published a draft report on their review of the (nearly 4 year old) WDRM initiative - and noting that submissions close today.
Submissions closing tomorrow (Wed 13th Aug 2025) to AEMO consultation on ‘Primary Frequency Response Test Guidelines for Semi-Scheduled Plant’
Worth noting, as I've just become aware, that submissions close tomorrow on AEMO's consultation on Primary Frequency Response (PFR) Test Guidelines for Semi-Scheduled Plant
Basslink flows over the past 18 days
Earlier today we posted an article about Tamar Valley CCGT getting a run. We should also have noted about Basslink flows, which we have done here.
Tamar Valley CCGT gets a run (late Monday 11th August 2025)
Monday evening 11th Aug 2025 a ‘unit start’ alert in the ‘Notifications’ widget of ez2view with respect to the TVCC201 unit triggered. We take a look.
Commencement of (testing) operations at Hunter (Kurri Kurri) GT in NSW
We saw first output from the HUNTER1 unit (the first of two at Snowy Hydro's new peaker) on Sunday 27th July 2025. So we're looking a little further, in this article.
Reece Unit 1 returns to service after outage (coincident with fire onsite) … but Unit 2 outage lengthens
On Sunday 3rd Aug 2025 there (appears to have been) a fire at Reece Power Station, and both units tripped. We saw REECE1 return to service Friday evening, but REECE2 looks set for a...