A short post to note our presentation for the CSIRO's South-East Asian System Planning Workshop in Brisbane this afternoon, and the analysis we shared. The post Today’s Presentation at the CSIRO and DFAT’s System Planning Workshop appeared first on WattClarity.| WattClarity
An updated look (as at 14:10 on Thu 28th Aug 2025) of expected return to service for YWPS2 The post Unplanned outage on Yallourn Unit 2 pushed out ~2 weeks (with new RTS Thursday 25th September 2025) appeared first on WattClarity.| WattClarity
We follow on from A 292MW drop in "Market Demand" in Tasmania, on Saturday 16th August 2025 enlisting this "Part 2" to understand the sequence of events using 4-second data. The post Tasmanian demand drop on 16 August 2025 – part 2 appeared first on WattClarity.| WattClarity
We assess whether the trip at Yallourn 2 on 26 August 2025 was large enough to drive a frequency disturbance. The post Frequency change with Yallourn unit 2 trip appeared first on WattClarity.| WattClarity
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. The post Peeling the onion a little more – Solar Farm performance on Tuesday 19th August 2025, with the frequency spike to 50.2Hz appeared first on WattClarity.| WattClarity
A very short article with a snapshot from ez2view at the 11:15 dispatch interval – highlighting that Lower 1-second FCAS prices in the South Australian region are spiking (yet again!). The post Prices spiking again in South Australia (for Lower 1 second FCAS) on Wednesday 27th August 2025 appeared first on WattClarity.| WattClarity
A first article about an unplanned (and potentially significant) outage at Yallourn unit 2 that began on Tuesday 26th August 2025 due to 'LP turbine issues'. The post Notable forced outage at Yallourn Unit 2 … due to ‘LP turbine issue’ appeared first on WattClarity.| WattClarity
A short note with a snapshot of the ‘Generator Outages’ widget in ez2view (at 08:30 on Wed 27th Aug 2025) to highlight some coal units offline. The post Several coal units offline (on Wednesday 27th August 2025) with unplanned outages appeared first on WattClarity.| WattClarity
Following from the release of the 2025 ESOO last Thursday, the subsequent weekly MT PASA run warns of *forecast* LRC (and unserved energy) in South Australia. The post Following the 2025 ESOO, MT PASA shows forecast Low Reserve Conditions in the South Australian region (Dec 2026 to March 2027) appeared first on WattClarity.| WattClarity
An article in the Australian by Colin Packham prompts a look in AEMO data about expectations for when Tamar Valley CCGT might be switched off. The post The current burst of production at Tamar Valley CCGT coming to an end, on Thu 28th August 2025? appeared first on WattClarity.| WattClarity
On Sunday 24th August 2025, Administered Pricing for FCAS in South Australia ended ... when will the ‘S-TBTU’ constraint set re-emerge? The post Administered Pricing for FCAS services in South Australia ended on Sunday 24th August 2025 … so what’s next? appeared first on WattClarity.| WattClarity
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. The post An updated tabular list of instances of large AggROT across Semi-Scheduled units appeared first on WattClarity.| WattClarity
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 post An updated long-range trend of large instances of Aggregate Raw Off-Target (AggROT) across all Semi-Scheduled units appeared first on WattClarity.| WattClarity
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. The post Three broader questions (re)triggered by the Frequency Spike on Tuesday 19th August 2025 appeared first on WattClarity.| WattClarity
On Thursday 21st August 2025 (a week earlier than I'd anticipated) the AEMO has released its 2025 ESOO. The post AEMO releases 2025 ESOO on Thursday 21st August 2025 appeared first on WattClarity.| WattClarity
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... The post AGL considering State Government request to keep Torrens Island open for two more years appeared first on WattClarity.| WattClarity
It appears it was unit availability used to set the target for dispatch that went awry, rather than unit output. The post Unit deviations from target on Tuesday 19th August 2025 appeared first on WattClarity.| WattClarity
Oliver Nunn from Endgame Economics argues that we must begin to think about the distribution of prices in the NEM as a function of weather. The post The increasingly stochastic and volatile NEM appeared first on WattClarity.| WattClarity
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. The post A ~50-day view of rising spurts of volatility in the LOWER1SEC FCAS market in South Australia appeared first on WattClarity.| WattClarity
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 for FCAS in South Australia The post Network outage on Tailem Bend – Tungkillo 275kV line ended Tue 19th Aug, but Administered Pricing Continues into Wed 20th Aug (part 3) appeared first on WattClarity.| WattClarity
On 21 March 2024, the AEMC made a final determination on the ‘Enhancing Reserve Information’ (ERI) rule change. Under the reform, there are two key dates: 1) From 1st July 2025, two changes are to be made: (a) Publication of previous day’s 5-min data for batteries (b) Publication of daily energy limits (total availability) for scheduled generators at the start of the trading day 2) From 1st July 2027, AEMO is to publish energy availability of batteries (i.e. state of charge in MWh), agg...| WattClarity
Both of the organisations who collaborate in the development of this series of Generator Statistical Digest (Global-Roam Pty Ltd, and Greenview Strategic Consulting) have a keen focus the generators in the market operating Semi-Scheduled assets. As such, they are keenly...| WattClarity
A chart of the the month-by-month semi-scheduled economic and network curtailment totals, along with the top 3 worst hit units over 2023.| WattClarity
It's Thursday 15th February 2024 and (in amongst the detailed analysis relating to Tue 13th Feb 2024 in Victoria) we're releasing the GSD2023 ... the Generator Statistical Digest for the 2023 calendar year.| WattClarity
Initial results from the first week since bid MaxAvail was enabled as a way for semi-scheduled generators to manage availability.| WattClarity
Delving deeper into dispatch availability self-forecasts and the assessment process to further enhance our understanding of this important aspect of the operation of the modern National Electricity Market| WattClarity
2024| WattClarity
2023| WattClarity
A blog that has been providing regular commentary and in-depth analysis into the complexities of Australia's National Electricity Market (NEM) since 2007.| WattClarity
2022| WattClarity
In this article we explain a different (and sometimes quite powerful) way of reviewing some performance metrics in relation to the passage of another dimension of time.| WattClarity
Following AEMO's MN122697 (published at 06:51 NEM time), we take a look at the 'forecast LOR2' condition for NSW on Monday 6th January 2025.| WattClarity
In what seems (to me) to be an extraordinary measure, AEMO speaks directly to the operators of Wind and Solar assets in the NEM, asking them to update the AEMO on the high-temperature limitations of their plant. How did it come to this?...| WattClarity
A first look back at yesterday (Friday 20th December 2019) in the Victorian region - where we saw extreme temperatures, high demand across VIC and SA and (perhaps because of high temperatures) a large discrepancy open up between forecast Wind Availability and actual. This would have contributed to the surprise LOR2 announcement and commencement of RERT negotiations.| WattClarity
It's quite early Friday morning, 1st October 2021 ... and Five Minute Settlement has commenced. Here's a *very* early initial look.| WattClarity
In her first article for WattClarity, Marcelle looks at questions raised in the recent summer on the forecasting of performance at high temperatures of wind and solar generators, and asks how AEMO and industry can work together to improve this.| WattClarity
The ‘Connection Point Dispatch (CPD) Price’ is a term that we coined through 2019 in the ongoing development of our ez2view software – and have since applied in the Generator Statistical Digest 2019. (A) What is the CPD Price? The...| WattClarity
Guest author, Allan O'Neil, takes us several steps further in understanding the events in Victoria on Tuesday 13th February 2024 - especially with respect to VRE (wind and solar) production.| WattClarity
The change to the NEM dispatch engine that supports the use of the energy bid's MaxAvail, for Semi-Scheduled generators, has been implemented.| WattClarity
Today (Tue 23rd May) is the go-live date for AEMO's EMMS v5.2 - which will contain new data for some market enhancements. Here's a quick look at where this first change will appear in ez2view, highlighting some considerations for Semi-Scheduled units and self-forecasting.| WattClarity
AEMO is re-enabling the ‘MaxAvail’ figure in bids for Semi-Scheduled units. It will act as a limit on capacity available, feeding into dispatch processes. We look at how Semi-Scheduled plant have currently been treating MaxAvail in the bid and share some insights.| WattClarity
Following up to AEMO's recent Intermittent Generator forum, Marcelle looks at the challenges for wind and solar farms in providing consistently good plant availability information to AEMO and the value of transparency of this data.| WattClarity
A collation of articles related to the consideration, approval, implementation and outcomes of the IESS rule change in June 2024 … which leads to: 1) The implementation of BDUs (Bi-Directional Units) and 2) The implementation of Hybrid units.| WattClarity
Following from a steady stream of questions we receive in relation to a range of our products (but in particular with respect to "the RenewEconomy Widget") we've invested some time to put this post together to explain some of what we understand about electricity demand.| WattClarity
A short note (on Monday 3rd June 2024) with the IESS changes going live today.| WattClarity
WattClarity® began in 2007. Since that time there have been hundreds of articles posted, and increasingly we’ve found ourselves posting articles specifically focused on assisting with different aspects of energy literacy (at least in part because of the challenges this represents in...| WattClarity
Our GSD2023 was released just over 4 weeks ago. Finally today I have a chance to utilise the GSD2023 Data Extract to take a look across all the Semi-Scheduled units (i.e. Wind and Solar) and see who's been using MaxAvail in their bid to limit their plant availability ... and the DUIDs that have not yet used this new facility.| WattClarity
It is indispensable to understand how the semi-scheduled unit availability gets produced. This article explains the key inputs and processes, focusing on the dispatch timeframe.| WattClarity
Page to be fleshed out, about the Semi-Scheduled category (A) Summary of current arrangements In short-hand, the operation of a DUID that is registered as Semi-Scheduled is part-way between the fully Scheduled category (with a very prescriptive set of requirements...| WattClarity
Reposting a portion of an article we published some years ago, to help readers understand the difference between a MW and a MWh.| WattClarity
A feature of the upcoming EMMS technical specification that distinguishes demand response units from scheduled loads could impact some users of NEM data, if left unmanaged.| WattClarity
Readers at WattClarity might recall that we have asked the question above a couple of times in recent weeks – and a big thanks to those who responded already! We’re blessed with opportunities at present (have been for a while,...| WattClarity
Guest author, Allan O'Neil, takes the release of the GSD2022 as an opportunity to take a look at the past 10 years of performance of the four-unit Liddell Power Station (one unit closed in 2022 and three to close soon in 2023), contrasting against two other black coal-fired stations.| WattClarity
On Thursday 23rd February, hot weather in SA drove 'Market Demand' to its highest level in just over 9 years, and delivered a bit of spot price volatility. We investigate....| WattClarity
A quick post about some evening volatility in VIC and SA| WattClarity
