A reverse chronological order index of significant events that have occurred through the history of the NEM, complete with links to additional documentation and discussion where available.

This record will evolve over time through future iterations, hence the authors would appreciate your suggestions in terms of other events to be included.

Data collated prior to January 2016 is sparser, deliberately, just to ensure the list is manageable.

12th June 2022 – Administered Pricing commences in the QLD after the region’s cumulative price hits it’s threshold.

1st February 2022 – The Reserve Trader is dispatched in QLD, and IPRM hits 5%.

1st January 2022 – Trip of Bell Bay No. 3 and No. 4 Potline s.

21st June 2021 – Gas supply and low wind conditions drove some periods of tight supply.

17th to 20th May 2021 – Periods with large price forecast differences occurred in VIC, SA & NSW (evening periods).

24th January 2021 – Bushfires in South Australia caused the trip of several transmission lines connecting into Cherry Gardens substation in the Adelaide Hills:

10th January 2020 – Both Eildon to Mt Beauty 220kV lines tripped and after reclosing tripped again and remained out of service. Following this, the power system was not in a secure state and constraint automation was used to manage the risk, primarily through formulations which adjusted interconnector flows.

4th January 2020 – Bushfires through the Snowy Mountains caused the separation of the NSW and VIC regions.

Late January 2019 – Multiple occasions (14th-18th, 22nd, 29th, 30th) of high afternoon and evening prices (in association with hot weather) forecast yet generally not eventuating due to rebidding.

17th February 2018: Trip of both Chalumbin to Woree 275 kV lines due to lightning, 30 MW generation and 204 MW Load lost.

12th March 2017 – Basslink trip resulting in 383 MW of Load shed in Tasmania.

8th February 2017 – SA System Event, High demand, Forced Outages and Load shedding to restore system security.

10th February 2017 – NSW System event. Record demand (14,181 MW), Forced Outages and Tomago Smelter load reduced to restore system security.

1st December 2016 – South Australian Separation Event.

Mid-July 2016 – Network outages to complete augmentation works on the Heywood Interconnector between Victoria and South Australia materially reduced its capacity (AER 13 September 2016, Electricity spot prices above $5000/MWh South Australia, 7 July 2016).  Average daily prices were above $500/MWh from 6 July to 8 July, and above $400/MWh 12 July to 14 July 2016.

10th December 2014 – Loss of Basslink and Transmission lines in Tasmania, 10 and 16 December and 23 Feb 2015.

5th January 2014 – Trip of Rowville to Yallourn 220 kV transmission line and Multiple Wind Farms.

11th December 2013 – Trip of Upper Tumut 330 kV Busbars, and loss of generation from Upper Tumut.

13th October 2013 – Trip of Rowville to Thomastown 220 kV line and Multiple Wind Farms.

13th October 2013 – Trip of Bayswater to Mt Piper 500 kV line and Wallerawang Unit 7.

29th September 2013 – Trip of Ringwood to Rowville 220 kV line and Multiple Generators.

Mid-June 2013 – In SA,  many instances of forecasts for high evening prices did not eventuate due to rebidding.

2nd March 2013 – Trip of Chalumbin to Woree 275 kV lines , Loss of generation at Barron Gorge Power Station, and 214 MW of load

9th March 2013 – Both Millmerran Units Tripped.

21st March 2013 – Lightning strikes and Load reductions at Pacific Aluminium Potline.

26th January 2013 – Trip of Gladstone to Calliope River 275 kV line and Gladstone Unit 1.

25th January 2013 – Trip of Sydney South to Wallerawang, Ingleburn to Wallerawang 33 kV lines and Trip of Wallerawang Unit 8 during bushfires.

8th January 2013 – Trip of Canberra to Capital and Capital to Kangaroo Valley 330 kV lines, Trip of Multiple WF’s during bushfires.

29th July 2010 – An operating error at the Point Henry smelter resulted in the trip of the 220 kV busbar and 105 MW load shed.

5th November 2009 – Calvale to Tarong 275 kV line tripped as well as Tarong Unit 2.

22nd January 2009 – System Black Event in North Queensland when Ross to Strathmore 275 kV lines tripped.  NEMMCO declared a System Black at 1736 hours as more than 60% North Qld demand had been interrupted.

29th October 2007 – Simultaneous outage of two 330 kV transmission lines in Southern NSW.

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