A detailed look at two specific trading periods in the day (Tuesday 24th July 2018) that saw negative dispatch prices occur at the start of trading periods – hence provided a case study for how existing Semi-Scheduled plant respond (especially in combination with transmission constraints and the Semi-Dispatch Cap).
The multi-region islanding event on Saturday 25th August was a very rare event – perhaps the only one’s that occurred in the history of the NEM. It has generated plenty of questions – and driven our analysis further. We share some more observations here, and keenly await the draft AEMO report.
Following on from Saturday’s islanding event, we use our current interest in AEMO’s 4-second SCADA data to prove a little more…
Both the QNI and the Heywood interconnectors tripped around the same time on Saturday 25th August 2018 (not apparent at this time which one was first, and why), leading to both QLD and SA regions being separately islanded from the rest of the mainland NEM. This also contributed to over 1,000MW of load shedding in NSW and VIC, and presumably some frequency excursions in QLD and SA.
A brief follow on from yesterday’s post, with the advantage of being able to review yesterday’s bids (and rebids) today.
The past week, with wind farm output blowing gangbusters in South Australia (coupled with low demand and System Strength requirements) we seen the “Wind Correlation Penalty” start to bite, with some reactions also beginning to show.
Highlighting the different approaches taken to cost/price based dispatch in an interconnected electricity system (or market).
Walking through 5 (much simplified) “Dispatch Intervals” to illustrate some starting principles of marginal price based dispatch arrangements, such as used in the National Electricity Market
Conversations in the week following my post about “Villain #4” (being the deficit in required Energy Literacy) prompted some analysis relating to Marginal Loss Factors
A year after I first spoke about “Villains” playing a role in the train wreck of our energy transition, I’ve finally found some time to post about Villain #4.
A back-dated article about the AEMO’s 2018 ISP
Some brief analysis of today’s price volatility seen in the South Australian region of the NEM
Returning to the theme of analysis of Q2 prices (completed in 2017 and 2016 due to Q2 historically being an uneventful period) we see that prices have backed off from the “off the charts” level of 2017, but are still much higher in all regions than most other regions. In some cases results are second worst in 20 years.
Some further thoughts on what we’ve termed a “Solar Correlation Penalty” which point-view of some specific dispatch intervals seems to suggest is occurring
All too often people (including us sometimes, unfortunately) are quick to attribute some particular outcome to a single contributing factor. Almost always this is an over-simplification.
Highlighting the temptation to ascribe motivation to others – despite the fact that we understand that we can never know for sure.
The start of some analysis that helps to identify the variety of factors that combined to give a shaky balance between supply and demand in NSW last week.
A comment made by TransGrid at the Energy Networks 2018 conference today jolted me to update my (somewhat) outdated paradigm of declining demand.
A collection of articles about events that occurred through winter 2018 in the NEM (i.e. from 1st June to 31st August 2018)
Yesterday (Thu 24th May) AEMO issued a Low Reserve Condition notice (at LOR2 level) for South Australia next Thursday 31st May. We take a quick look….