Bushfires under interconnectors through Snowy Mountains cause separation of NSW from VIC region


At 15:10 (NEM time) the Victoria and New South Wales regions separated at Murray and Lower Tumut Substation as a result of the bushfires raging through the south-east of Australia (and, in particular, under some key transmission lines connecting NSW to Victoria

Here’s the view of what was happening in NSW for the 15:20 dispatch interval, seen via the NEMwatch v10 entry level dashboard:

2020-01-04-at-15-20-NEMwatch-PowerSystemSeparation

As noted in that screenshot, AEMO (and TransGrid, the network operator) had experienced 4 separate transmission line outages over the prior 2-hour period as a result:

Time
… reverse chronological
Details
14:38 MARKET NOTICE 072285
Notice Type ID Inter-Regional Transfer limit variation
Notice Type Description MARKET
Issue Date Saturday, 4 January 2020
External Reference Inter-Regional Transfer limit variation – Upper Tumut to Yass 330 kV Line – NSW Region
________________________________________________________________________________________________AEMO ELECTRICITY MARKET NOTICE

Inter-Regional Transfer limit variation – Upper Tumut to Yass 330 kV Line – NSW Region

There has been an unplanned outage of the Upper Tumut to Yass 330 kV Line

The following constraint set was invoked at 1425 hrs 04/01/2020.

N-UTYS_2

The constraint set contains the following interconnectors on the left hand side.

V-S-MNSP1
VIC1-NSW1

Refer AEMO Network Outage Scheduler (NOS) for further details.

Manager NEM Real Time Operations

14:35 MARKET NOTICE 072284
Notice Type ID Inter-Regional Transfer limit variation
Notice Type Description MARKET
Issue Date Saturday, 4 January 2020
External Reference Inter-Regional Transfer limit variation – 3W Capital to Kangaroo Valley 330 kV Line – NSW region
________________________________________________________________________________________________AEMO ELECTRICITY MARKET NOTICE

Inter-Regional Transfer limit variation – 3W Capital to Kangaroo Valley 330 kV Line – NSW region

There has been an unplanned outage of Capital to Kangaroo Valley 330 kV 3W Line

The following constraint set was invoked at 1425 hrs 04/01/2020.

N-KVCW_3W_15M

The constraint set contains the following interconnectors on the left hand side.

V-S-MNSP1
VIC1-NSW1
NSW1-QLD1
N-Q-MNSP1

Refer AEMO Network Outage Scheduler (NOS) for further details.

Manager NEM Real Time Operations

13:51 MARKET NOTICE 072282
Notice Type ID Inter-Regional Transfer limit variation
Notice Type Description MARKET
Issue Date Saturday, 4 January 2020
External Reference Inter-Regional Transfer limit variation – Murray to Upper Tumut 65 330 kV Line – NSW Region
________________________________________________________________________________________________AEMO ELECTRICITY MARKET NOTICE

Inter-Regional Transfer limit variation – Murray to Upper Tumut 65 330 kV Line – NSW Region

There has been an unplanned outage of the Murray to Upper Tumut 65 330 kV Line

The following constraint set was invoked at 1350 hrs 04/01/2020.

I-X_MSUT_LTUT

The constraint set contains the following interconnectors on the left hand side.

NSW1-QLD1
T-V_MNSP1
V-SA
V-S-MNSP1
VIC1-NSW1

The following constraint set was revoked at 1350 hrs 04/01/2020

N-LTUT_64_15M

Refer AEMO Network Outage Scheduler (NOS) for further details.

Manager NEM Real Time Operations

13:24 MARKET NOTICE 072281
Notice Type ID Inter-Regional Transfer limit variation
Notice Type Description MARKET
Issue Date Saturday, 4 January 2020
External Reference Inter-Regional Transfer limit variation – Upper Tumut to Lower Tumut 64 330 kV Line – NSW Region
________________________________________________________________________________________________AEMO ELECTRICITY MARKET NOTICE

Inter-Regional Transfer limit variation – Upper Tumut to Lower Tumut 64 330 kV Line – NSW Region

There has been an unplanned outage of the Upper Tumut to Lower Tumut 64 330 kV Line.

The following constraint set was invoked at 1320 hrs 04/01/2020.

N-LTUT_64_15M

The constraint set contains the following interconnectors on the left hand side.

V-S-MNSP1
VIC1-NSW1

Refer AEMO Network Outage Scheduler (NOS) for further details.

Manager NEM Real Time Operations

We

 

Here’s how this reduction in flow looked via the ez2view higher-end dashboard in the 15:40 dispatch interval:

2020-01-04-at-15-40-ez2view-SeparationExplained

… so it was no surprise to see the price spike to the Market Price Cap in the NSW region in the 15:45 dispatch interval:

2020-01-04-at-15-45-ez2view-NSWatMPC

… this will be a long afternoon…

About the Author

Paul McArdle
One of three founders of Global-Roam back in 2000, Paul has been CEO of the company since that time. As an author on WattClarity, Paul's focus has been to help make the electricity market more understandable.

1 Comment on "Bushfires under interconnectors through Snowy Mountains cause separation of NSW from VIC region"

  1. The interesting point is that contrary to predictions it was NSW which went to $14,700/ MWh and Victorian prices went negative, indicating a strong oversupply in Victoria. At 5:25 pm after transmission was was restored, NSW was importing on all three links at limit values, power was still at $14,700/MWh and Victoria only rose to $34.
    My summation is as I predicted a couple of years ago that NSW may actually more vulnerable than Victoria

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