Market Operations Archives

AEMO publishes Final Report on 24th January 2021 (total loss of SCADA systems)

Mon 27^th September 2021 8:00 PM | Paul McArdle

A short back-dated article, to link in AEMO's final report on this incident.

What happened at each of the DUIDs impacted by the ‘Q>>NIL_CLWU_RGLC’ constraint equation on Sunday 24th January 2021 (Part 5)

Mon 23^th August 2021 7:00 AM | Paul McArdle

It's now seven months since the SCADA outage on Sunday 24th January 2021 - and we're finally able to complete and publish this (quite long) article exploring some...

Do you know what’s causing some increased latency on P5MIN data files on MarketNet in recent weeks (Potential Tripwire #4)?

Sun 15^th August 2021 5:27 PM | Paul McArdle

Re-posted with update: In recent weeks we have noticed a trend towards increased latency in the creation of the ‘PUBLIC_P5MIN_*.csv’ files published by AEMO on MarketNet, and we...

Plenty of things went wrong in Queensland last Tuesday, but some very important things went right

Mon 31^th May 2021 3:08 PM | Allan O'Neil

Whilst there were many things that went wrong on Tuesday 25th May 2021 (last week), guest author Allan O'Neil highlights that there were at least 4 things that...

Callide C Catastrophic Failure

Mon 31^th May 2021 1:39 PM | Carl Daley

Carl Daley from EnergyByte, provides more insight into the events of last Tuesday, which culminated in widespread blackouts throughout Queensland.

There were 3 events on Tue 25th May – and it seems likely that QNI separated briefly in Event 2

Fri 28^th May 2021 3:59 PM | Paul McArdle

A deeper look at the frequency data (our own, and also from some others) reveals a number of other interesting things about what happened on Tuesday 25th May...

ABC news report suggests Callide C4 will be offline for a long, long time

Thu 27^th May 2021 5:58 PM | Paul McArdle

My evening reading of an ABC news article (about Callide C) released this afternoon suggests a long, long and expensive outage for Callide C4.

Sequence of Events on 25 May – A Very Short & Partial Visual Guide

Thu 27^th May 2021 4:50 PM | Allan O'Neil

Normally this would be part of a much more complete article adding to WattClarity’s growing coverage of the major power system events in Queensland following the incident at...

Here’s 7 of the Headline Questions we’re pondering about, following the dramas in Central Queensland on Tuesday 25th May

Thu 27^th May 2021 3:58 PM | Paul McArdle

Sharing 7 of the 'Headline Questions' we're pondering, as we bury ourselves in the data surrounding the events that happened on Tuesday 25th May ... some of which...

Three Events Yesterday – with Mainland Frequency as low as 48.555Hz

Wed 26^th May 2021 2:12 PM | Paul McArdle

Part 5 in an expanding series, looking at what happened in QLD on Tuesday 25th May 2021 - this one looking at system frequency.

Callide C4 (tentatively) offline for a year – following turbine hall fire yesterday!

Wed 26^th May 2021 10:00 AM | Paul McArdle

First update, day after the event, shows a cautious (initial) approach to returning the 4 units at the Callide site back to service.

QLD dodged a bullet …. Tue 25th May 2021 (Part 3)?

Tue 25^th May 2021 8:35 PM | Paul McArdle

Third short article this evening, after it looks like we've escaped from a tight supply/demand balance (reasonably) unscathed.

Hold onto your hats … QLD’s supply demand balance forecast to be very tight in the hours ahead … Tue 25th May 2021 (Part 2)

Tue 25^th May 2021 4:24 PM | Paul McArdle

Looks set to be a very tight supply/demand balance this evening in Queensland. Here's hoping everything goes right for the AEMO Control Room!

Loss of ~2000MW of demand in Queensland on Tuesday 25th May

Tue 25^th May 2021 2:27 PM | Paul McArdle

A quick snapshot from NEMwatch at 14:20 today highlighting the loss of approximately 2000MW of demand this afternoon – dropping the level of Scheduled Demand down to 3,775MW:...

How reversion to static line rating in the ‘Q>>NIL_CLWU_RGLC’ constraint equation contributed the price spike on Sunday 24th January 2021 (Part 4)

Mon 19^th April 2021 12:27 PM | Paul McArdle

More time has elapsed since 'Part 3' on 24th March - today I'm posting a shorter piece (Part 4) that explains how RHS of the ‘Q>>NIL_CLWU_RGLC’ constraint equation...

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