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.
Eventful Days
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...
High level view of some contributing factors to 19 August frequency spike
Among other aspects, a large dip in solar UIGF aligns with the frequency deviation observed on 19th August 2025.
Mainland Frequency Spikes to 50.2 on Tue 19th August 2025
On Tuesday the 19th of August between 11:45 and 12:20 there was a significant frequency deviation on the mainland.
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.
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.
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...
Recapping operations at Waratah BESS (including enablement for SIPS) … to August 2025
The Waratah Super Battery System Integrity Protection Scheme (SIPS) was enabled by TransGrid at last Friday 1st August 2025. This prompts this look back on operations thus far.
Possible Fire at Reece Power Station – units out of service
Following a tip from a WattClarity reader, we take a quick look at a forced outage for both units at the Reece (hydro) Power Station in Tasmania ... possibly related to an apparent fire...
Lower 1-second FCAS volatility continues in SA
A brief article to note the continued impact of the Tailem Bend to Tungkillo line outage on FCAS prices.
NEM-wide wind generation exceeds 10GW for the first time, on Friday evening 25th July 2025
A belated post to note a new all-time record for wind production was broken on Friday evening.
Basslink flows shift since end of agreement on 30th June 2025
An agreement restraining how Basslink is bid into the energy market has ended, resulting in changes in bidding and energy flows.
Volatility within the contingency FCAS market in SA today, Thursday 24th July 2025
A short post to note some price volatility for the 'Lower 1 Sec' contingency FCAS commodity in SA today, with prices flickering between the FCAS price floor and the market price cap.