AEMO issues (short-notice, short-lived) direction for System Strength in NSW on Sunday 5th October 2025

A short article for Sunday 5th October 2025 to record a series of five consecutive Market Notices – beginning at 06:52 with MN129416 noting possible intervention in ~30 minutes time as follows:

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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 05/10/2025 06:52:58

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Notice ID : 129416
Notice Type ID : MARKET INTERVENTION
Notice Type Description : Reserve Contract / Direction / Instruction
Issue Date : 05/10/2025
External Reference : Foreseeable AEMO intervention in NSW region

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Reason :

AEMO ELECTRICITY MARKET NOTICE

Foreseeable AEMO intervention in NSW region

AEMO has identified a foreseeable circumstance that may require an AEMO intervention event in the NSW region from 0730 hrs 05/10/2025.

The foreseeable circumstance requiring the need for intervention is System Strength.

AEMO estimates that, in the absence of sufficient market response by 0720 hrs 05/10/2025, AEMO may need to intervene by issuing a direction.

Manager NEM Real Time Operations

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END OF REPORT
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Then at 07:23 with MN129417 the AEMO notes the Direction issued from the 07:25 dispatch interval.

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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 05/10/2025 07:23:16

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Notice ID : 129417
Notice Type ID : MARKET INTERVENTION
Notice Type Description : Reserve Contract / Direction / Instruction
Issue Date : 05/10/2025
External Reference : Direction – NSW region to Snowy Hydro Limited – MURR2-2 MURRAY2

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Reason :

AEMO ELECTRICITY MARKET NOTICE

Direction – NSW region to Snowy Hydro Limited – MURR2-2 MURRAY2

Refer to Market Notice 129418

In accordance with section 116 of the National Electricity Law, AEMO is issuing a direction to Snowy Hydro Limited. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).

Direction issued to: Snowy Hydro Limited – MURR2-2 MURRAY2 at 0720 hrs 05/10/2025
Type of resource: generating unit
Required actions: Synchronise and operate as a synchronous condenser at 0730 hrs 05/10/2025
Services provided: System Strength
Circumstances necessitating the Direction:System Strength
Circumstances necessitating the Direction additional detail: intervention is required to maintain the power system in a secure operating state
Expected duration: 0830 hrs 05/10/2025 / further notice.

Snowy Hydro Limited does not incur any civil monetary liability for a relevant action taken in accordance with this direction unless the action is taken in bad faith.

Manager NEM Real Time Operations

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END OF REPORT
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… then continuing at 07:23 with MN129418 noting that intervention (but not intervention pricing) applies:

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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 05/10/2025 07:23:33

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Notice ID : 129418
Notice Type ID : MARKET INTERVENTION
Notice Type Description : Reserve Contract / Direction / Instruction
Issue Date : 05/10/2025
External Reference : Direction – NSW region 05/10/2025

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Reason :

AEMO ELECTRICITY MARKET NOTICE

Direction – NSW region 05/10/2025

In accordance with section 116 of the National Electricity Law, AEMO has issued a direction to a participant in the NSW region. For the purposes of the National Electricity Rules this is a direction under clause 4.8.9(a1)(1).

The issue of the direction commences an AEMO intervention event. AEMO declares all trading intervals during the event to be intervention trading intervals, commencing from the interval ending 0725 hrs on 05/10/2025.

Intervention pricing does not apply to this AEMO intervention event.

AEMO may issue or revoke additional directions in order to meet the current requirement, unless sufficient market response is provided. A further market notice will be issued when all directions related to this requirement have been cancelled.

Manager NEM Real Time Operations

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END OF REPORT
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This was followed within a relatively short space of time (at 08:31 with MN129419) with the cancellation of the direction:

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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 05/10/2025 08:31:58

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Notice ID : 129419
Notice Type ID : MARKET INTERVENTION
Notice Type Description : Reserve Contract / Direction / Instruction
Issue Date : 05/10/2025
External Reference : Cancellation: Direction issued to: Snowy Hydro Limited – MURR2-2 MURRAY2

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Reason :

AEMO ELECTRICITY MARKET NOTICE

Cancellation: Direction issued to: Snowy Hydro Limited – MURR2-2 MURRAY2

Refer to Market Notice 129417

Direction is cancelled from: 0830 hrs 05/10/2025

Manager NEM Real Time Operations

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END OF REPORT
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This series concluded at 08:32 with MN129420 as follows:

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MARKET NOTICE
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From : AEMO
To : NEMITWEB1
Creation Date : 05/10/2025 08:32:22

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Notice ID : 129420
Notice Type ID : MARKET INTERVENTION
Notice Type Description : Reserve Contract / Direction / Instruction
Issue Date : 05/10/2025
External Reference : Cancellation – AEMO Intervention Event – NSW region 05/10/2025

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Reason :

AEMO ELECTRICITY MARKET NOTICE

Cancellation – AEMO Intervention Event – NSW region 05/10/2025

Refer to Market Notice 129418

The AEMO Intervention Event and all associated directions are cancelled from 0830 hrs on 05/10/2025.

Manager NEM Real Time Operations

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END OF REPORT
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